Patent Application
20240368972
The present disclosure relates to systems and methods for providing configurable staged rate increase function to operate hydraulic fracturing units and, more particularly, to systems and methods for providing configurable staged rate increase function to operate hydraulic fracturing units to pump fracturing fluid into a wellhead.
Hydrocarbon exploration and energy industries employ various systems and operations to accomplish activities including drilling, formation evaluation, stimulation, and production. Hydraulic fracturing may be utilized to produce oil and gas economically from low permeability reservoir rocks or other formations, for example, shale, at a wellsite. During a hydraulic fracturing stage, slurry may be pumped, via hydraulic fracturing pumps, under high pressure to perforations, fractures, pores, faults, or other spaces in the reservoir rocks or formations. The slurry may be pumped at a rate faster than the reservoir rocks or formation may accept. As the pressure of the slurry builds, the reservoir rocks or formation may fail and begin to fracture further. As the pumping of the slurry continues, the fractures may expand and extend in different directions away from a well bore. Once the reservoir rocks or formations are fractured, the hydraulic fracturing pumps may remove the slurry. As the slurry is removed, proppants in the slurry may be left behind and may “prop” or keep open the newly formed fractures, thus preventing the newly formed fractures from closing or, at least, reducing contraction of the newly formed fractures. After the slurry is removed and the proppants are left behind, production streams of hydrocarbons may be obtained from the reservoir rocks or formation.
Prime movers may be used to supply power to hydraulic fracturing pumps for pumping the fracturing fluid into the formation. For example, a plurality of gas turbine engines and/or reciprocating-piston engines may each be mechanically connected to a corresponding hydraulic fracturing pump via a transmission and operated to drive the hydraulic fracturing pump. The prime mover, hydraulic fracturing pump, transmission, and auxiliary components associated with the prime mover, hydraulic fracturing pump, and transmission may be connected to a common platform or trailer for transportation and set-up as a hydraulic fracturing unit at the site of a fracturing operation, which may include up to a dozen or more of such hydraulic fracturing units operating together to perform the fracturing operation.
A hydraulic fracturing operation may include a plurality of hydraulic fracturing stages. Each hydraulic fracturing stage may require configuration of many and various hydraulic fracturing equipment. For example, prior to a next hydraulic fracturing stage, an operator or user may enter multiple data points for the next hydraulic fracturing stage for each piece of equipment, such as, for hydraulic fracturing pumps, a blender, a chemical additive unit, a hydration unit, a conveyor, and/or other hydraulic fracturing equipment located at the wellsite. As each hydraulic fracturing stage arises, data entry or other inputs at each piece of hydraulic fracturing equipment may not be performed efficiently and effectively.
Partly due to the large number of components of a hydraulic fracturing system, it may be difficult to efficiently and effectively control the output of the numerous hydraulic fracturing units and related components. For example, during a fracturing operation, it may be necessary to reduce the output of one or more of the hydraulic fracturing pumps in a coordinated manner, for example, when unexpected well screen-out or over-pressure conditions occur while conducting the fracturing operation. During such occurrences, as well as others, it may be necessary to quickly adjust the outputs of the numerous hydraulic fracturing pumps to reduce the likelihood of equipment damage, which may lead to expensive repairs and excessive down time. In addition, during the start-up of a fracturing operation, as the hydraulic fracturing units increase the output of fracturing fluid, it may be desirable to control the rate at which the outputs of the respective hydraulic fracturing units increase, for example, to prevent damage to the hydraulic fracturing pumps due to uncontrolled over-speed events. Due to the numerous hydraulic fracturing units, this may be difficult and complex. In addition, as a fracturing operation approaches completion, it may be desirable to control the rate at which the hydraulic fracturing units decrease their respective outputs. Due to the numerous hydraulic fracturing units, this may be difficult and complex to execute efficiently and effectively.
Accordingly, Applicant has recognized a need for systems and methods that provide improved operation of hydraulic fracturing units during hydraulic fracturing operations. The present disclosure may address one or more of the above-referenced drawbacks, as well as other possible drawbacks.
As referenced above, due to the complexity of a hydraulic fracturing operation and the high number of machines involved, it may be difficult to efficiently and effectively control the output of the numerous hydraulic fracturing units and related components to perform the hydraulic fracturing operation. In addition, manual control of the hydraulic fracturing units by an operator or user may result in delayed or ineffective responses to problems that may occur during the hydraulic fracturing operation, such as well screen-out, over-pressure events, and over speeding of the hydraulic fracturing pumps as the hydraulic fracturing units come up to operating speed. Insufficiently prompt responses to such events may lead to premature equipment wear or damage, which may reduce efficiency and lead to delays in completion of a hydraulic fracturing operation.
The present disclosure generally is directed to systems and methods for operating hydraulic fracturing units to pump fracturing fluid into a wellhead. For example, in some embodiments, the systems and methods may provide semi- or fully-autonomous operation of a plurality of hydraulic fracturing units, for example, during start-up, operation, and/or completion of operation of the plurality of hydraulic fracturing units following a hydraulic fracturing operation.
According to some embodiments, a method of operating a plurality of hydraulic fracturing units, each of the hydraulic fracturing units including a hydraulic fracturing pump to pump fracturing fluid into a wellhead and an internal combustion engine to drive the hydraulic fracturing pump, may include receiving, via a supervisory controller, one or more rate ramp signals indicative of a rate ramp operational mode to control a flow rate associated with pumping fracturing fluid into a wellhead. The method also may include receiving, via a supervisory controller, one or more operational parameters associated with pumping fracturing fluid into a wellhead. The one or more operational parameters may include one or more of a target flow rate, a maximum flow rate, a target pressure, or a pressure range for fracturing fluid supplied to the wellhead. The method also may include determining, via the supervisory controller, whether the plurality of hydraulic fracturing units have a capacity sufficient to achieve the one or more of the target flow rate or the target pressure. The method further may include initiating operation of at least some of the plurality of hydraulic fracturing units, and increasing a flow rate from the at least some of the hydraulic fracturing units according to a controlled increasing flow rate schedule toward the one or more of the target flow rate or the target pressure. The controlled increasing flow rate schedule may be configured to cause operation of the hydraulic fracturing units, such that a flow rate of fracturing fluid does not exceed the maximum flow rate and a fracturing fluid pressure substantially remains within the pressure range. The method further still may include determining whether the at least some of the hydraulic fracturing units have achieved the one or more of the target flow rate or the target pressure. When it has been determined that the one or more of the target flow rate or the target pressure has been achieved, the method also may include operating the at least some hydraulic fracturing units to maintain one or more of the target flow rate or the target pressure. When it has been determined that the target flow rate has not been achieved, the method also may include generating one or more signals indicative of a failure to achieve the target flow rate. When it has been determined that the target pressure has not been achieved, the method further may include operating the at least some hydraulic fracturing units to maintain a maximum flow rate.
According some embodiments, a hydraulic fracturing control assembly to operate a plurality of hydraulic fracturing units, each of the hydraulic fracturing units including a hydraulic fracturing pump to pump fracturing fluid into a wellhead and an internal combustion engine to drive the hydraulic fracturing pump, may include an input device configured to facilitate communication of rate ramp signals indicative of a rate ramp operational mode to control a flow rate associated with pumping fracturing fluid into a wellhead, and operational parameters to a supervisory controller. The one or more operational parameters may include one or more of a target flow rate, a maximum flow rate, a target pressure, or a pressure range. The hydraulic fracturing assembly further may include one or more sensors configured to generate one or more sensor signals indicative of one or more of a flow rate of fracturing fluid or a pressure associated with fracturing fluid. The hydraulic fracturing control assembly may further still include a supervisory controller in communication with one or more of the plurality of hydraulic fracturing units, the input device, or the one or more sensors. The supervisory controller may be configured to receive one or more operational parameters associated with pumping fracturing fluid into a wellhead. The one or more operational parameters may include one or more of a target flow rate or a target pressure for fracturing fluid supplied to the wellhead. The supervisory controller also may be configured to determine whether the plurality of hydraulic fracturing units have a capacity sufficient to achieve the one or more of the target flow rate or the target pressure. The supervisory controller further may be configured to increase a flow rate from at least some of the hydraulic fracturing units according to a controlled increasing flow rate schedule toward the one or more of the target flow rate or the target pressure. The controlled increasing flow rate schedule may be configured to cause operation of the hydraulic fracturing units, such that a flow rate of fracturing fluid does not exceed the maximum flow rate and a fracturing fluid pressure substantially remains within the pressure range. The supervisory controller still further may be configured to determine, based at least in part on the one or more sensor signals indicative of one or more of the flow rate of fracturing fluid or the pressure associated with fracturing fluid, whether the at least some of the hydraulic fracturing units have achieved the one or more of the target flow rate or the target pressure. When it has been determined that the one or more of the target flow rate or the target pressure has been achieved, the supervisory controller may be configured to operate the at least some hydraulic fracturing units to maintain one or more of the target flow rate or the target pressure. When it has been determined that the target flow rate has not been achieved, the supervisory controller may be configured to generate one or more signals indicative of a failure to achieve the target flow rate. When it has been determined that the target pressure has not been achieved, the supervisory controller may be configured to operate the at least some hydraulic fracturing units to maintain a maximum flow rate.
According to some embodiments, a hydraulic fracturing system may include a plurality of hydraulic fracturing units. Each of the hydraulic fracturing units may include a hydraulic fracturing pump to displace fracturing fluid into a wellhead and an internal combustion engine to drive the hydraulic fracturing pump. The hydraulic fracturing system also may include an input device configured to facilitate communication of rate ramp signals indicative of a rate ramp operational mode to control a flow rate associated with pumping fracturing fluid into a wellhead, and operational parameters to a supervisory controller. The one or more operational parameters may include one or more of a target flow rate, a maximum flow rate, a target pressure, or a pressure range for fracturing fluid supplied to the wellhead. The hydraulic fracturing system further may include one or more sensors configured to generate one or more sensor signals indicative of one or more of a flow rate of fracturing fluid or a pressure associated with fracturing fluid. The hydraulic fracturing system still further may include a supervisory controller in communication with one or more of the plurality of hydraulic fracturing units, the input device, or the one or more sensors. The supervisory controller may be configured to receive one or more operational parameters associated with pumping fracturing fluid into a wellhead. The one or more operational parameters may include one or more of a target flow rate or a target pressure for fracturing fluid supplied to the wellhead. The supervisory controller also may be configured to determine whether the plurality of hydraulic fracturing units have a capacity sufficient to achieve the one or more of the target flow rate or the target pressure. The supervisory controller further may be configured to increase a flow rate from at least some of the hydraulic fracturing units according to a controlled increasing flow rate schedule toward the one or more of the target flow rate or the target pressure. The controlled increasing flow rate schedule may be configured to cause operation of the hydraulic fracturing units, such that a flow rate of fracturing fluid does not exceed the maximum flow rate and a fracturing fluid pressure substantially remains within the pressure range. The supervisory controller still further may be configured to determine, based at least in part on the one or more sensor signals indicative of one or more of the flow rate of fracturing fluid or the pressure associated with fracturing fluid, whether the at least some of the hydraulic fracturing units have achieved the one or more of the target flow rate or the target pressure. When it has been determined that the one or more of the target flow rate or the target pressure has been achieved, the supervisory controller may be configured to operate the at least some hydraulic fracturing units to maintain one or more of the target flow rate or the target pressure. When it has been determined that the target flow rate has not been achieved, the supervisory controller may be configured to generate one or more signals indicative of a failure to achieve the target flow rate. When it has been determined that the target pressure has not been achieved, the supervisory controller may be configured to operate the at least some hydraulic fracturing units to maintain a maximum flow rate.
Still other aspects and advantages of these exemplary embodiments and other embodiments, are discussed in detail herein. Moreover, it is to be understood that both the foregoing information and the following detailed description provide merely illustrative examples of various aspects and embodiments, and are intended to provide an overview or framework for understanding the nature and character of the claimed aspects and embodiments. Accordingly, these and other objects, along with advantages and features of the present disclosure herein disclosed, will become apparent through reference to the following description and the accompanying drawings. Furthermore, it is to be understood that the features of the various embodiments described herein are not mutually exclusive and may exist in various combinations and permutations.
The accompanying drawings, which are included to provide a further understanding of the embodiments of the present disclosure, are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure, and together with the detailed description, serve to explain principles of the embodiments discussed herein. No attempt is made to show structural details of this disclosure in more detail than can be necessary for a fundamental understanding of the embodiments discussed herein and the various ways in which they can be practiced. According to common practice, the various features of the drawings discussed below are not necessarily drawn to scale. Dimensions of various features and elements in the drawings can be expanded or reduced to more clearly illustrate embodiments of the disclosure.
The drawings include like numerals to indicate like parts throughout the several views, the following description is provided as an enabling teaching of exemplary embodiments, and those skilled in the relevant art will recognize that many changes may be made to the embodiments described. It also will be apparent that some of the desired benefits of the embodiments described can be obtained by selecting some of the features of the embodiments without utilizing other features. Accordingly, those skilled in the art will recognize that many modifications and adaptations to the embodiments described are possible and may even be desirable in certain circumstances. Thus, the following description is provided as illustrative of the principles of the embodiments and not in limitation thereof.
The phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. As used herein, the term “plurality” refers to two or more items or components. The terms “comprising,” “including,” “carrying,” “having,” “containing,” and “involving,” whether in the written description or the claims and the like, are open-ended terms, i.e., to mean “including but not limited to,” unless otherwise stated. Thus, the use of such terms is meant to encompass the items listed thereafter, and equivalents thereof, as well as additional items. The transitional phrases “consisting of” and “consisting essentially of,” are closed or semi-closed transitional phrases, respectively, with respect to any claims. Use of ordinal terms such as “first,” “second,” “third,” and the like in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish claim elements.
In some embodiments, one or more of the GTEs may be a dual-fuel or bi-fuel GTE, for example, capable of being operated using of two or more different types of fuel, such as natural gas and diesel fuel, although other types of fuel are contemplated. For example, a dual-fuel or bi-fuel GTE may be capable of being operated using a first type of fuel, a second type of fuel, and/or a combination of the first type of fuel and the second type of fuel. For example, the fuel may include gaseous fuels, such as, for example, compressed natural gas (CNG), natural gas, field gas, pipeline gas, methane, propane, butane, and/or liquid fuels, such as, for example, diesel fuel (e.g., #2 diesel), bio-diesel fuel, bio-fuel, alcohol, gasoline, gasohol, aviation fuel, and other fuels as will be understood by those skilled in the art. Gaseous fuels may be supplied by CNG bulk vessels, a gas compressor, a liquid natural gas vaporizer, line gas, and/or well-gas produced natural gas. Other types and associated fuel supply sources are contemplated. The one or more internal combustion engines 18 may be operated to provide horsepower to drive the transmission 20 connected to one or more of the hydraulic fracturing pumps 16 to fracture a formation during a well stimulation project or fracturing operation.
In some embodiments, the fracturing fluid may include, for example, water, proppants, and/or other additives, such as thickening agents and/or gels. For example, proppants may include grains of sand, ceramic beads or spheres, shells, and/or other particulates, and may be added to the fracking fluid, along with gelling agents to create a slurry as will be understood by those skilled in the art. The slurry may be forced via the hydraulic fracturing pumps 16 into the formation at rates faster than can be accepted by the existing pores, fractures, faults, or other spaces within the formation. As a result, pressure builds rapidly to the point where the formation fails and begins to fracture. By continuing to pump the fracturing fluid into the formation, existing fractures in the formation are caused to expand and extend in directions farther away from a well bore, thereby creating additional flow paths to the well. The proppants may serve to prevent the expanded fractures from closing or may reduce the extent to which the expanded fractures contract when pumping of the fracturing fluid is ceased. Once the well is fractured, large quantities of the injected fracturing fluid may be allowed to flow out of the well, and the water and any proppants not remaining in the expanded fractures may be separated from hydrocarbons produced by the well to protect downstream equipment from damage and corrosion. In some instances, the production stream may be processed to neutralize corrosive agents in the production stream resulting from the fracturing process.
In the example shown in
The hydraulic fracturing pumps 16, driven by the respective internal combustion engines 18, discharge the slurry (e.g., the fracking fluid including the water, agents, gels, and/or proppants) at high flow rates and/or high pressures through individual high-pressure discharge lines 42 into two or more high-pressure flow lines 44, sometimes referred to as “missiles,” on the frac manifold 38. The flow from the high-pressure flow lines 44 is combined at the frac manifold 38, and one or more of the high-pressure flow lines 44 provide fluid flow to a manifold assembly 46, sometimes referred to as a “goat head.” The manifold assembly 46 delivers the slurry into a wellhead manifold 48. The wellhead manifold 48 may be configured to selectively divert the slurry to, for example, one or more wellheads 50 via operation of one or more valves. Once the fracturing process is ceased or completed, flow returning from the fractured formation discharges into a flowback manifold, and the returned flow may be collected in one or more flowback tanks as will be understood by those skilled in the art.
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Some embodiments also may include a data center 60 configured to facilitate receipt and transmission of data communications related to operation of one or more of the components of the hydraulic fracturing system 10. Such data communications may be received and/or transmitted via hard-wired communications cables and/or wireless communications, for example, according to known communications protocols, such as Wi-Fi®, Bluetooth®, ZigBee®, or forms of near field communications. In addition, signal communication may include one or more intermediate controllers or relays disposed between elements that are in signal communication with one another. For example, the data center 60 may contain at least some components of the hydraulic fracturing control assembly 14, such as a supervisory controller 62 configured to receive signals from components of the hydraulic fracturing system 10 and/or communicate control signals to components of the hydraulic fracturing system 10, for example, to at least partially control operation of one or more components of the hydraulic fracturing system 10, such as, for example, the internal combustion engines 18, the transmissions 20, and/or the hydraulic fracturing pumps 16 of the hydraulic fracturing units 12, the chemical additive units 24, the hydration units 28, the blender 30, the conveyers 32, the frac manifold 38, the manifold assembly 46, the wellhead manifold 48, and/or any associated valves, pumps, and/or other components of the hydraulic fracturing system 10.
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For example, the supervisory controller 62 may be in signal communication with an input device 64, such as a display, terminal, and/or a computing device, as well as associated input devices. Further, the display may be included with a computing device. The computing device may include a user interface (the user interface to be displayed on the display). In such examples, the user interface may be a graphical user interface (GUI). In another example, the user interface may be an operating system. In such examples, the operating system may include various firmware, software, and/or drivers that allow a user to communicate or interface with, via input devices, the hardware of the computing device and, thus, with the supervisory controller 62. The computing device may include other peripherals or input devices, for example, a mouse, pointer device, a keyboard, and/or a touchscreen. The supervisory controller 62 may send or transmit prompts, requests, or notifications to the display, for example, through the computing device to the display. In some embodiments, a user (as used herein, “user” may refer an operator, a single operator, a person, or any personnel at the wellsite hydraulic fracturing system 10) may send data (such as, through data entry, via an input device, into a computing device associated with the display for a hydraulic fracturing stage profile) and responses (such as, through user selection of a prompt, via the input device, on the display) from the display to the supervisory controller 62.
In some embodiments, the operational parameters 66 may include, but are not limited to, a target flow rate, a maximum flow rate, a target pressure, a pressure range, and/or a minimum flow rate associated with fracturing fluid supplied to the wellhead 50. In some examples, a user associated with a hydraulic fracturing operation performed by the hydraulic fracturing system 10 may provide one more of the operational parameters 66 to the supervisory controller 62, and/or one or more of the operational parameters 66 may be stored in computer memory and provided to the supervisory controller 62 upon initiation of at least a portion of the hydraulic fracturing operation.
In some embodiments, a rate ramp mode may be enabled or disabled during a hydraulic fracturing stage. For example, a user may select a button (e.g., a physical or virtual display button) on a user interface. In some embodiments, prior to selecting or enabling the rate ramp mode, the user may configure and/or set-up the rate ramp mode, so increases in fracturing flow rate may be performed efficiently. In some examples, when configuring the rate ramp mode, the user may set a maximum allowable fracturing fluid flow rate (e.g., a maximum amount of barrels of fracturing fluid to be added to the fracturing fluid flow rate and, in some examples, within a user-defined fracturing fluid pressure range). For example, during low pressure pumping at the beginning of a hydraulic fracturing stage, the maximum fracturing fluid flow rate increase may be relatively higher, for example, as there may be a relatively reduced chance for the fracturing fluid pressure to spike when the fluid flow rate is increased. In some embodiments, when the fracturing fluid pressure is approaching a maximum allowable fluid pressure (e.g., a user-defined maximum fluid pressure), the rate of increase of the fluid flow rate may be reduced, for example, so the fracturing fluid pressure does not rapidly increase, which may result in an over-pressure event may that result in the supervisory controller 62 intervening and/or may cause a main discharge line pressure relief system to release pressure.
In some embodiments, once the operational parameters are accepted by the supervisory controller 62 as being within allowable ranges stored or pre-programmed into the supervisory controller 62, the rate ramp mode may be activated and used during the hydraulic fracturing stage. In some embodiments, the supervisory controller 62 may use sensor signals 74 (e.g., analog inputs) from one or more pressure sensors (e.g., the hydraulic fracturing unit sensors 72 and/or the wellhead sensors 90) to determine the output pressure from the hydraulic fracturing units 12 and/or at the wellhead 50. In some embodiments, the supervisory controller 62 may be configured to use the sensor signals to determine the pressure range in which the hydraulic fracturing units 12 are operating, for example, relative to the rate ramp mode (e.g., according to the controller increasing flow rate schedule 82). In some embodiments, regardless of whether the hydraulic fracturing system 10 is being operated in a manual mode or according to a constant flow rate mode, the configured rate for the pressure range may designate the maximum flow rate that may be added to the hydraulic fracturing stage at any single rate increase.
In some embodiments, once an initial flow rate increase has been executed, a time delay may be performed to ensure that the flow rate does not increase immediately after each addition of a flow rate increase to the hydraulic fracturing stage. Once the time delay is complete, the user or the supervisory controller 62, in some examples, may increase the flow rate again. In some embodiments, once the fracturing fluid pressure has increased to a next pressure range according to the controlled increasing flow rate schedule 82, the increase in flow rate that may be added to the flow rate may decrease and a time delay maybe executed again. In some embodiments, during semi- or fully-autonomous control or in pressure mode, the rate ramp mode may be present and operating substantially simultaneously with automatic flow rate and automatic pressure modes, which may ensure or increase the likelihood that flow rate increases during these functions are performed efficiently and at a controlled rate, which results in a target flow rate being achieved, for example, in an S-bend curve fashion.
In some embodiments, an equipment profiler (e.g., a pump profiler) may calculate, record, store, and/or access data related each of the hydraulic fracturing units 12 including, but not limited to, pump data 68 including pump characteristics 70, maintenance data associated with the hydraulic fracturing units 12 (e.g., maintenance schedules and/or histories associated with the hydraulic fracturing pump 16, the internal combustion engine 18, and/or the transmission 20), operation data associated with the hydraulic fracturing units 12 (e.g., historical data associated with horsepower, fluid pressures, fluid flow rates, etc., associated with operation of the hydraulic fracturing units 12), data related to the transmissions 20 (e.g., hours of operation, efficiency, and/or installation age), data related to the internal combustion engines 18 (e.g., hours of operation, available power, and/or installation age), information related to the hydraulic fracturing pumps 16 (e.g., hours of operation, plunger and/or stroke size, maximum speed, efficiency, health, and/or installation age), equipment health ratings (e.g., pump, engine, and/or transmission condition), and/or equipment alarm history (e.g., life reduction events, pump cavitation events, pump pulsation events, and/or emergency shutdown events). In some embodiments, the pump characteristics 70 may include, but are not limited to minimum flow rate, maximum flow rate, harmonization rate, and/or pump condition, collectively identified as 71 in
In the embodiments shown in
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In some embodiments, the supervisory controller 62 may be configured to receive one or more operational parameters 66 associated with pumping fracturing fluid into the wellhead 50. For example, the operational parameters 66 may include a target flow rate and/or a target pressure 80 for fracturing fluid supplied to the wellhead 50. The supervisory controller 62 also may be configured to receive one or more pump characteristics 70, for example, associated with each of the hydraulic fracturing pumps 16 of the respective hydraulic fracturing units 12. As described previously herein, in some embodiments, the pump characteristics 70 may include a minimum flow rate, a maximum flow rate, a harmonization rate, and/or a pump condition 82 (individually or collectively) provided by the corresponding hydraulic fracturing pump 16 of a respective hydraulic fracturing unit 12. The pump characteristics 70 may be provided by a user, for example, via the input device 64 and/or via a pump profiler, as described previously herein.
In some embodiments, the supervisory controller 62 may be configured to determine whether the hydraulic fracturing units 12 have a capacity sufficient to achieve the target flow rate and/or the target pressure 80. For example, the supervisory controller 62 may be configured to make such determinations based at least partially on one or more of the pump characteristics 70, which the supervisory controller 62 may use to calculate (e.g., via addition) the collective capacity of the hydraulic fracturing units 12 to supply a sufficient flow rate and/or a sufficient pressure to achieve the target flow rate and/or the target pressure 80 at the wellhead 50. For example, the supervisory controller 62 may be configured to determine a total pump flow rate by combining at least one of the pump characteristics 70 for each of the plurality of hydraulic fracturing pumps 16, and comparing the total pump flow rate to the target flow rate. In some embodiments, determining the total pump flow rate may include adding the maximum flow rates of each of the hydraulic fracturing pumps 16.
In some embodiments, the supervisory controller 62 may be configured to receive one or more signals indicative of a pump condition of one or more hydraulic fracturing pumps 16 of the plurality of hydraulic fracturing units 16 and determine the maximum flow rate for each of the hydraulic fracturing pumps 16 based at least in part on the one or more signals indicative of pump condition. In some embodiments, the pump condition may include one or more of total pump strokes, maximum recorded pressure produced, maximum recorded flow produced, maximum recorded pump speed produced, total pump hours of operation, pressure pump efficiency health, pump installation age, pump deration based on health, pump cavitation events, pump pulsation events, emergency shut-down events, and/or any other use-related characteristics of the hydraulic fracturing pumps 16.
In some embodiments, upon initiation of a fracturing operation, for example, by a user associated with the hydraulic fracturing system 10, the supervisory controller 62 may be configured to increase a flow rate from at least some of the hydraulic fracturing units 12 according to a controlled increasing flow rate schedule 82 toward the target flow rate and/or the target pressure 80. In some embodiments, the controlled increasing flow rate schedule may cause operation of the hydraulic fracturing units, such that a flow rate of fracturing fluid does not exceed the maximum flow rate and a fracturing fluid pressure substantially remains within the pressure range. For example, rather than allowing the hydraulic fracturing units 12 to increase respective flow rate outputs in an uncontrolled manner (e.g., at a rate provided by the output of the internal combustion engine 18), the supervisory controller 62 may ramp-up the flow rate at a lower rate of change than could be achieved without control. This may reduce the likelihood or prevent the hydraulic fracturing pumps 16 from over-speeding and/or being subjected to cavitation by the fracturing fluid when increasing the flow rate toward the target flow rate and/or target pressure 80. In some embodiments, the controlled flow rate increase provided by the controlled increasing flow rate schedule 82 may be substantially constant (e.g., the rate of change of the flow rate may remain substantially constant), may be increasing as the flow rate increases, may be decreasing as the flow rate increases, and/or may increase or decrease based at least partially on the flow rate. In some examples, flow rates provided by different hydraulic fracturing units 12 may change according to different schedules and/or strategies, for example, such that the hydraulic fracturing units 12 do not increase flow rate at the same rate and/or according to the same schedule.
In some embodiments, the supervisory controller 62 may be configured to increase the flow rate from at least some of the hydraulic fracturing units 12 by maintaining a rate of change of the flow rate provided by at least some of the hydraulic fracturing units 12 below a maximum rate of change of the flow rate until at least some of the hydraulic fracturing units 12 have achieved the target flow rate and/or the target pressure. For example, the supervisory controller 62 may be configured to determine the maximum rate of change of the flow rate by changing the maximum rate of change of the flow rate as the total flow rate increases to achieve the target flow rate and/or the target pressure. In some embodiments, the supervisory controller 62 may be configured to receive one or more signals indicative fracturing fluid pressure at the wellhead 50, and determine the maximum rate of change of the flow rate based at least in part on the one or more signals indicative of the fluid pressure at the wellhead 50.
Table 1 below provides an example controlled increasing flow rate schedule 82. According to the example in Table 1, the rate of change of the flow rate is reduced as the fracturing fluid pressure increases, from a maximum rate of change of 3 barrels per minute per second (BPM/sec), up until a fracturing fluid pressure of 500 pounds per square inch (psi). Above 500 psi fracturing fluid pressure, the rate of change of the flow rate decreases to 2 BPM/see until the fracturing fluid pressure reaches 5,000 psi. From 5,000 psi to 10,000 psi fracturing fluid pressure, the rate of change of the flow rate is reduced to 1 BPM/sec. Above 10,000 psi, the rate of change of the flow rate is further reduced to 0.5 BPM/sec. In some embodiments, the supervisory controller 62 may be configured to generate one or more pump flow rate signals and/or pump pressure signals 84, which may be communicated to one or more of the hydraulic fracturing units 12 to control operation of the hydraulic fracturing pumps 16, the internal combustion engines 18, and/or the transmissions 20, such that the output of the hydraulic fracturing pumps 16 corresponds to the one or more control signals 84.
As described in more detail below, during operation of the hydraulic fracturing system 10, the supervisory controller 62 may be configured to receive one or more signals indicative of a maximum fluid pressure at the wellhead 50. For example, a user may use the input device 64 to provide a maximum fluid pressure at the wellhead 50, the maximum fluid pressure may be stored and/or accessed by the supervisory controller 62, and/or the maximum fluid pressure may be calculated by the supervisory controller 62 based at least in part on, for example, one or more of the operational parameters 66, one or more of the pump characteristics 70, and/or information relating to the well. In some embodiments, when the fluid pressure at the wellhead 50 increases to within an upper range of the maximum fluid pressure, the supervisory controller 62 may be configured to generate one or more notification signals 86 indicative of the fluid pressure being within the upper range of the maximum fluid pressure. The upper range may range from about 25% below the maximum pressure to about 5% below the maximum pressure (e.g., about 10% below the maximum pressure). In some embodiments, when the fracturing fluid pressure at the wellhead 50 increases to within the upper range of the maximum fluid pressure, the supervisory controller 62 may be configured to reduce a rate of change of the flow rate provided by the hydraulic fracturing units 12 and/or reduce the target flow rate, for example, according to a rate of flow rate change (e.g., 2.5% per second), and/or generate one or more notification signals 86 indicative of reducing the target rate, which may be received by one or more output devices 88 to notify an on-site user and/or remotely located personnel, for example, as described herein.
In some embodiments, a maximum operating pressure set point may be established that may be less than a wellhead kick-out pressure, for example, a fracturing fluid pressure at the wellhead 50, above which the supervisory controller 62 will cause the hydraulic fracturing system 10 to reduce pumping output and/or cease pumping output. In such embodiments, if it is determined that the fracturing fluid pressure at the wellhead 50 approaches to within a specified upper range of the wellhead kick-out pressure, the supervisory controller 62 may be configured to generate one or more notification signals 86 to notify an on-site or remotely-located user or computing device communicating an indication (e.g., an alarm) of the fracturing fluid pressure approaching the wellhead kick-out pressure. In some embodiments, the notification signals 86 may be communicated to one or more output devices 88, which may be configured to provide a visual, audible, and/or tactile (e.g., vibration) alarm for a user located on-site and/or personnel located remotely from the hydraulic fracturing operation, such as at a fracturing management facility. The output device(s) 88 may include a computer display device, a hand-held computing device, such as a smartphone, a tablet, and/or a dedicated held-held display device. In some embodiments, the output device(s) 88 may include a speaker, a siren, an alarm, and/or a hand-held computing device. In some embodiments, following reducing the target flow rate, when the fracturing fluid pressure at the wellhead 50 falls below a lower range of the maximum fluid pressure, the supervisory controller 62 may be configured to increase the flow rate provided by the hydraulic fracturing units 12, for example, until the fracturing fluid pressure at the wellhead 50 returns to within the upper range of the maximum fluid pressure.
In some embodiments, the supervisory controller 62 also may be configured to generate one or more control signals 84 causing one or more of the hydraulic fracturing units 12 to operate according to a slow rate adjustment mode, for example, to reduce the likelihood or prevent the fracturing fluid pressure from reaching or exceeding the wellhead kick-out pressure. For example, as shown in Table 1, the slow rate adjustment may be set to 0.5 BPM/sec. In some examples, the upper range (e.g., within twenty percent, fifteen percent, ten percent, or five percent of the wellhead kick-out pressure) may be set by the user and/or may be predetermined and stored in memory accessible by the supervisory controller 62. Upon triggering of the slow rate adjustment mode, some embodiments of supervisory controller 62 may be configured communicate one or more control signals 84 to one or more of the hydraulic fracturing units 12, so that they can operate to provide the flow rate corresponding to the slow rate adjustment. In some embodiments, the slow rate adjustment may be set by the user and/or may be predetermined and stored in memory accessible by the supervisory controller 62.
In some embodiments, the supervisory controller 62 may be configured to determine, based at least in part on the one or more sensor signals 74 indicative of flow rate of fracturing fluid and/or the pressure associated with fracturing fluid at the wellhead 50, whether at least some of the hydraulic fracturing units 12 have achieved the target flow rate and/or the target pressure 80. In some embodiments, the supervisory controller 62 may receive sensor signals 74 from one or more wellhead sensors 90 configured to generate one or more signals indicative of the flow rate and/or fracturing fluid pressure 84. In some embodiments, the supervisory controller 62 may receive sensor signals 74 indicative of flow rate of fracturing fluid and/or the pressure associated with fracturing fluid from the one or more sensors 72 associated with each of the hydraulic fracturing units 12. In some such embodiments, the supervisory controller 62 may be configured to combine (e.g., add together) the flow rates and/or pressures from the sensors 74 to determine a total flow rate and/or a total pressure. In some embodiments, the supervisory controller 62 may be configured to receive sensor signals 74 from the one or more hydraulic fracturing units 12 and the wellhead sensors 90 and determine whether the at least some of the hydraulic fracturing units 12 have achieved the target flow rate and/or the target pressure 80, for example, at the wellhead 50.
In some embodiments, the supervisory controller 62, based at least in part on determination of whether the hydraulic fracturing units 12 have achieved the target flow rate and/or the target pressure 80, may be configured to control operation of one or more of the hydraulic fracturing units 12. For example, when it has been determined (e.g., via the supervisory controller 62) that the one or more of the target flow rate or the target pressure 80 has been achieved, the supervisory controller 62 may be configured to cause one or more of the hydraulic fracturing units 12 to operate to substantially maintain the target flow rate and/or the target pressure 80. For example, the supervisory controller 62 may generate the pump flow rate control signals and/or the pump pressure control signals 84 (see
In some examples, once the target flow rate and/or the target pressure 80 has been achieved, the supervisory controller 62 may be configured to receive one or more signals indicative of a total flow rate of fracturing fluid supplied by the hydraulic fracturing units 12 to the wellhead 50. Based at least in part on the one or more signals indicative of the total flow rate, the supervisory controller 62 may be configured to determine whether the total flow rate is decreasing relative to the target flow rate. Based at least in part on this determination, the supervisory controller 62 may be configured to increase the flow rate to substantially maintain the target flow rate, for example, when it has been determined (e.g., by the supervisory controller 62) that the total flow rate is decreasing relative to the target flow rate. In some embodiments, when it has been determined that the total flow rate is substantially equal to the target flow rate, the supervisory controller 62 may be configured to maintain the target flow rate.
In some embodiments, when it has been determined (e.g., via the supervisory controller 62) that the target flow rate has not been achieved, the supervisory controller 62 may be configured to generate one or more notification signals 86 indicative of a failure to achieve the target flow rate. For example, prior to initiation of the fracturing operation, a user may use the input device 64 to select via, for example, a graphical user interface, that the hydraulic fracturing system 10 operate according to a first mode of operation, which may be configured to control operation of the one or more hydraulic fracturing units 12 according to a flow rate-based strategy, for example, as explained in more detail with respect to
In some embodiments, when it has been determined (e.g., via the supervisory controller 62) that the target pressure has not been achieved, the supervisory controller 62 may be configured to operate the hydraulic fracturing units 12 to substantially maintain a maximum flow rate. For example, prior to initiation of the fracturing operation, a user may use the input device 64 to select via, for example, a graphical user interface, that the hydraulic fracturing system 10 operate according to a second mode of operation, which may be configured to control operation of the one or more hydraulic fracturing units 12 according to a fracturing fluid pressure-based strategy, for example, as explained in more detail with respect to
In some embodiments, when the hydraulic fracturing control assembly 14 is operating according to the second mode of operation (e.g., the target pressure-based mode), when the maximum total flow rate has not been achieved, the supervisory controller 62 may be configured to substantially maintain the fracturing fluid pressure at the wellhead 50 to within a pressure differential of the fracturing fluid pressure by (1) increasing the total flow rate to increase the fracturing fluid pressure at the wellhead 50 to be within the pressure differential, or (2) decreasing the total flow rate to decrease the fracturing fluid pressure at the wellhead 50 to be within the pressure differential. In some embodiments, the pressure differential may be included with the operational parameters 66, which may be provided by the user prior to beginning pumping of fracturing fluid by the hydraulic fracturing units 12, for example, via the input device 64. The pressure differential may range from about 100 psi to about 800 psi, from about 200 psi to about 600 psi, or from about 300 psi to about 500 psi.
In some embodiments, when hydraulic fracturing control assembly 14 is operating according to the second mode of operation (e.g., the target pressure-based mode), the supervisory controller 62 may be configured to receive the one or more operational parameters associated with pumping fracturing fluid into a wellhead 50, including receiving a maximum flow rate, which may be provided by the user. In such embodiments, the supervisory controller 62 may be configured to increase the flow rate from the hydraulic fracturing units 12 while substantially maintaining the flow rate from the hydraulic fracturing units 12 below the maximum flow rate.
Some embodiments of the supervisory controller 62 may be configured to substantially maintain the flow rate and/or fluid pressure provided by the hydraulic fracturing units 12, for example, if a user causes generation of one or more signals indicative of switching out of the first mode of operation or the second mode of operation, for example, to a third manual mode of operation. For example, if the supervisory controller 62 is controlling operation of the hydraulic fracturing units 12 according to the first or second modes of operation, the user may cause the supervisory controller 62 to exit the mode of operation, such that the user may manually control operation of the hydraulic fracturing units 12. For example, the user may use the input device 64 to exit the first or second mode of operation. Under such circumstances, the supervisory controller 62 may be configured to cause the hydraulic fracturing units 12 to continue to operate at flow rates substantially the same as flow rates at the time of receipt of the one or more signals indicative of ceasing the first or second modes of operation. Thereafter, the user may manually generate control signals for controlling operation and/or the output of the hydraulic fracturing units 12. In some embodiments, even when operation has been switched to a manual mode, safety systems to detect and control operation during events, such as well screen-outs and/or over-pressure conditions, may continue to be controlled by the supervisory controller 62.
In some embodiments, the supervisory controller 62 may also be configured to receive one more signals indicative of fluid pressure (e.g., at the wellhead 50) and determine whether a well screen-out or an over-pressure condition exists, collectively identified as 92 in
In some embodiments, at the completion of one or more stages of the fracturing operation, the supervisory controller 62 may be configured to decrease the flow rate from the hydraulic fracturing units 12 according to a controlled decreasing flow rate schedule 96 (see
The example method 300, at 302, may include receiving a target flow rate associated with pumping fracturing fluid into a wellhead. For example, a user of the hydraulic fracturing system may use an input device to provide operational parameters associated with the fracturing operation, which may include one or more of a target flow rate, a maximum flow rate, a target pressure, or a pressure range for fracturing fluid supplied to the wellhead. A supervisory controller may receive the operational parameters as a basis for controlling operation of the hydraulic fracturing units. In some examples of the method 300, the user may specify operation of the hydraulic fracturing units according to a first mode of operation, which controls operation of one or more hydraulic fracturing units according to a flow rate-based strategy. In some examples of the method 300, the supervisory controller may receive one or more rate ramp signals indicative of a rate ramp operational mode to control a flow rate associated with pumping fracturing fluid into a wellhead.
At 304, the example method 300 further may include determining whether the hydraulic fracturing units have a capacity sufficient to achieve the target flow rate. For example, the supervisory controller may be configured to calculate the capacity based at least in part on pump characteristics received from a pump profiler, for example, as previously described herein.
If, at 304, it is determined that the hydraulic fracturing units lack sufficient capacity to achieve the target flow rate, at 306, the example method 300 also may include stopping the hydraulic fracturing process and/or generating one or more notification signals indicative of the insufficient capacity, for example, as discussed herein.
If, at 304, it is determined that the hydraulic fracturing units have a capacity sufficient to achieve the target flow rate, at 308, the example method 300 also may include initiating operation of the hydraulic fracturing units. For example, the supervisory controller may generate control signals for commencing operation of the hydraulic fracturing units.
The example method 300, at 310, also may include increasing a flow rate from the hydraulic fracturing units according to a controlled increasing flow rate schedule toward the target flow rate, for example, as previously described herein. In some examples of the method 300, the controlled increasing flow rate schedule may cause operation of the hydraulic fracturing units, such that a flow rate of fracturing fluid does not exceed the maximum flow rate and a fracturing fluid pressure substantially remains within the pressure range.
At 312, the example method 300 also may include determining whether a well screen-out or an over-pressure condition exists. In some embodiments of the method 300, this may be performed substantially continuously by the supervisory controller during the hydraulic fracturing operation, for example, as described previously herein.
If, at 312, it is determined that a well screen-out or an over-pressure condition exists, at 314, the example method 300 also may include one or more determination or other action steps. For example, if the rate ramp is running, and it is identified that a potential well screen-out situation is approaching, commencing, or occurring, then a first step may be a reduction of the proppant concentration, and thereafter a reduction of the rate. The reduced rate thereafter may be maintained. If, when maintaining the reduced rate, the pressure still is not at a constant and continues increasing, then the rate may be reduced further or potentially the job may be ceased. Accordingly, the method further may include ceasing the hydraulic fracturing process and/or generating one of more notification signals indicative of the insufficient capacity as will be understood by those skilled in the art. In some embodiments of the method 300, one or more of these determinations or actions may be performed by the supervisory controller during the hydraulic fracturing operation, for example, as described previously herein.
If, at 312, it is determined that a well screen-out or an over-pressure condition does not exist, at 316, the example method 300 further may include continuing to increase the flow rate from the hydraulic fracturing units according to the controlled increasing flow rate schedule toward the target flow rate. In some embodiments of the method 300, this may be performed by the supervisory controller, for example, as described previously herein.
Referring to
The example method 300, at 320, further may include receiving signals indicative of a total flow rate of the hydraulic fracturing units. For example, the supervisory controller may receive the signals, for example, as described previously herein.
The example method 300, at 322, may include determining whether the total flow rate is decreasing relative to the target flow rate. In some embodiments of the method 300, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 322, it is determined that the total flow rate is not decreasing relative to the target flow rate, at 324, the example method 300 also may include maintaining the target flow rate. In some embodiments of the method 300, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 322, it is determined that the total flow rate is decreasing relative to the target flow rate, at 326, the example method 300 further may include increasing the flow rate to substantially maintain the target flow rate. In some embodiments of the method 300, this may be performed by the supervisory controller, for example, as described previously herein.
The example method 300, at 328, further may include receiving signals indicative of a blender output upstream of the plurality of hydraulic fracturing units. In some embodiments of the method 300, this may be performed substantially continuously during the hydraulic fracturing operation by the supervisory controller.
The example method 300, at 330, also may include controlling operation of each of the hydraulic fracturing units based at least in part on the signals indicative of the blender output. For example, if the blender output is insufficient to supply the hydraulic fracturing units with fracturing fluid to maintain the target flow rate, the target flow rate may be reduced to a point at which the blender output is sufficient to supply fracturing fluid to the hydraulic fracturing units to achieve the lowered target flow rate.
At 332, the example method 300 also may include receiving one or more signals indicative of completion of one or more stages of a hydraulic fracturing operation. For example, when the fracturing operation is substantially complete, the user may use an input device to indicate that the fracturing operation is complete. In some embodiments, the supervisory controller may be configured to automatically generate the one or more signals indicative of completion, for example, based at least partially on duration of operation, a total amount of fracturing fluid pumped by the hydraulic fracturing units, and/or pressure at the wellhead.
At 334, the example method 300 may further include decreasing the flow rate from the hydraulic fracturing units according to a controlled decreasing flow rate schedule toward zero or no flow, for example, as previously described herein. After 334, the example method 300 may end.
The example method 400, at 402, may include receiving a maximum flow rate and a target pressure associated with pumping fracturing fluid into a wellhead. For example, a user may use the input device to provide operational parameters, which may include one or more of a target flow rate, a maximum flow rate, a target pressure, or a pressure range for fracturing fluid supplied to the wellhead. A user of the hydraulic fracturing system may use an input device to provide operational parameters associated with the fracturing operation. A supervisory controller may receive the operational parameters as a basis for controlling operation of the hydraulic fracturing units. In some examples of the method 400, the user may specify operation of the hydraulic fracturing units according to a second mode of operation, which controls operation of one or more hydraulic fracturing units according to a pressure-based strategy. In some examples of the method 400, the supervisory controller may receive one or more rate ramp signals indicative of a rate ramp operational mode to control a flow rate associated with pumping fracturing fluid into a wellhead.
At 404, the example method 400 further may include receiving signals indicative of operation of the hydraulic fracturing units according to a constant pressure mode, for example, as compared to a target flow rate mode, for example, as described with respect to
At 406, the example method 400 also may include determining whether the hydraulic fracturing units are able to achieve the target pressure. For example, the supervisory controller may receive pump characteristics for each of the hydraulic fracturing units and determine whether the hydraulic fracturing units have sufficient capacity to achieve the target pressure, for example, as described previously herein.
The example method 400, at 408, further may include initiating operation of the hydraulic fracturing units. For example, the supervisory controller may generate control signals for commencing operation of the hydraulic fracturing units.
The example method 400, at 410, also may include increasing a flow rate from the hydraulic fracturing units according to a controlled increasing flow rate schedule toward the maximum flow rate or target pressure, for example, as previously described herein with respect to
At 412, the example method 400 also may include determining whether a well screen-out or an over-pressure condition exists. In some embodiments of the method 400, this may be performed by the supervisory controller substantially continuously during the hydraulic fracturing operation.
If, at 412, it is determined that a well screen-out or an over-pressure condition exists, at 414, the example method 400 also may include stopping the hydraulic fracturing process and/or generating one of more notification signals indicative of the insufficient capacity, for example, as discussed herein.
If, at 412, it is determined that a well screen-out or an over-pressure condition does not exist, at 416, the example method 400 further may include continuing to increase the flow rate from the hydraulic fracturing units according to the controlled increasing flow rate schedule toward the maximum pressure or the target pressure, for example, as previously described herein.
Referring to
If, at 418, it is determined that the hydraulic fracturing units have not achieved the target pressure, the example method 400 may skip to 434 (see
If, at 418, it is determined that the hydraulic fracturing units have achieved the target pressure, at 420, the example method 400 may include operating the hydraulic fracturing units at flow rates to maintain the target pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
The example method 400, at 422, further may include determining whether the pressure is decreasing relative to the target pressure. For example, the supervisory controller may receive signals indicative of the pressure at the wellhead and determine whether the pressure has decreased relative to the target pressure, for example, as previously described herein.
If, at 422, it is determined that the pressure is not decreasing relative to the target pressure, at 424, the example method 400 also may include maintaining the flow rates to maintain the target pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 422, it is determined that the pressure is decreasing relative to the target pressure, at 426, the example method 400 further may include determining whether the pressure has decreased to more than a threshold amount less than the target pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 426, it is determined that the pressure has decreased to more than the threshold amount less than the target pressure, the example method 400 may skip to 434 (see
If, at 426, it is determined that the pressure has not decreased to more than the threshold amount less than the target pressure, at 428, the example method 400 further may include determining whether the pressure has increased to more than a threshold amount more than the target pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 426, it is determined that the pressure has increased to more than a threshold amount more than the target pressure, the example method 400, at 430, may include decreasing the flow rates to reduce the pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein. At 432, the example method 400 also may include returning to 418.
If, at 428, it is determined that the pressure has not increased to more than a threshold amount more than the target pressure, the example method 400 may skip to 446 (see
Referring to
If, at 434, it is determined that the maximum flow rate has not been achieved, at 436, the method 400 also may include increasing the flow rates to achieve the maximum flow rate. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 434, it is determined that the maximum flow rate has been achieved, at 438, the method 400 further may include operating the hydraulic fracturing units to maintain the maximum flow rate. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
At 440, the example method 400 may further include determining whether the pressure has increased to more than a threshold amount more than the target pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
If, at 440, it is determined that the pressure has increased to more than the threshold amount more than the target pressure, at 442, the method 400 also may include decreasing flow rates to reduce the pressure. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein. At 444, the example method 400 further may include returning to 418 (see
If, at 440, it is determined that the pressure has not increased to more than the threshold amount more than the target pressure, at 446, the method 400 further may include operating the hydraulic fracturing units to maintain the maximum flow rate. In some embodiments of the method 400, this may be performed during the fracturing operation by the supervisory controller, for example, as described previously herein.
The example method 400, at 448, further may include receiving one or more signals indicative of completion of one or more stages of a hydraulic fracturing operation. For example, when the fracturing operation is substantially complete, the user may use an input device to indicate that the fracturing operation is complete. In some embodiments, the supervisory controller may be configured to automatically generate the one or more signals indicative of completion, for example, based at least partially on duration of operation, a total amount of fracturing fluid pumped by the hydraulic fracturing units, and/or pressure at the wellhead.
The example method 400, at 450, may include decreasing the flow rate from the hydraulic fracturing units according to a controlled decreasing flow rate schedule toward zero or no flow, for example, as previously described herein. After 450, the example method 400 may end.
It should be appreciated that subject matter presented herein may be implemented as a computer process, a computer-controlled apparatus, a computing system, or an article of manufacture, such as a computer-readable storage medium. While the subject matter described herein is presented in the general context of program modules that execute on one or more computing devices, those skilled in the art will recognize that other implementations may be performed in combination with other types of program modules. Generally, program modules include routines, programs, components, data structures, and other types of structures that perform particular tasks or implement particular abstract data types.
Those skilled in the art will also appreciate that aspects of the subject matter described herein may be practiced on or in conjunction with other computer system configurations beyond those described herein, including multiprocessor systems, microprocessor-based or programmable consumer electronics, minicomputers, mainframe computers, handheld computers, mobile telephone devices, tablet computing devices, special-purposed hardware devices, network appliances, and the like.
The memory 502 may be used to store program instructions that are loadable and executable by the processor(s) 500, as well as to store data generated during the execution of these programs. Depending on the configuration and type of the supervisory controller 62, the memory 502 may be volatile (such as random access memory (RAM)) and/or non-volatile (such as read-only memory (ROM), flash memory, etc.). In some examples, the memory devices may include additional removable storage 504 and/or non-removable storage 506 including, but not limited to, magnetic storage, optical disks, and/or tape storage. The disk drives and their associated computer-readable media may provide non-volatile storage of computer-readable instructions, data structures, program modules, and other data for the devices. In some implementations, the memory 502 may include multiple different types of memory, such as static random access memory (SRAM), dynamic random access memory (DRAM), or ROM.
The memory 502, the removable storage 504, and the non-removable storage 506 are all examples of computer-readable storage media. For example, computer-readable storage media may include volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data. Additional types of computer storage media that may be present may include, but are not limited to, programmable random access memory (PRAM), SRAM, DRAM, RAM, ROM, electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile discs (DVD) or other optical storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which may be used to store the desired information and which may be accessed by the devices. Combinations of any of the above should also be included within the scope of computer-readable media.
The supervisory controller 62 may also include one or more communication connection(s) 508 that may facilitate a control device (not shown) to communicate with devices or equipment capable of communicating with the supervisory controller 62. The supervisory controller 62 may also include a computer system (not shown). Connections may also be established via various data communication channels or ports, such as USB or COM ports to receive cables connecting the supervisory controller 62 to various other devices on a network. In some examples, the supervisory controller 62 may include Ethernet drivers that enable the supervisory controller 62 to communicate with other devices on the network. According to various examples, communication connections 508 may be established via a wired and/or wireless connection on the network.
The supervisory controller 62 may also include one or more input devices 510, such as a keyboard, mouse, pen, voice input device, gesture input device, and/or touch input device. The one or more input device(s) 510 may correspond to the one or more input devices 64 described herein with respect to
Turning to the contents of the memory 502, the memory 502 may include, but is not limited to, an operating system (OS) 514 and one or more application programs or services for implementing the features and embodiments disclosed herein. Such applications or services may include remote terminal unit(s) 516 for executing certain systems and methods for controlling operation of the hydraulic fracturing units 12 (e.g., semi- or full-autonomously controlling operation of the hydraulic fracturing units 12), for example, upon receipt of one or more control signals generated by the supervisory controller 62. In some embodiments, each of the hydraulic fracturing units 12 may include a remote terminal unit 516. The remote terminal unit(s) 516 may reside in the memory 502 or may be independent of the supervisory controller 62. In some examples, the remote terminal unit(s) 516 may be implemented by software that may be provided in configurable control block language and may be stored in non-volatile memory. When executed by the processor(s) 500, the remote terminal unit(s) 516 may implement the various functionalities and features associated with the supervisory controller 62 described herein.
As desired, embodiments of the disclosure may include a supervisory controller 62 with more or fewer components than are illustrated in
References are made to block diagrams of systems, methods, apparatuses, and computer program products according to example embodiments. It will be understood that at least some of the blocks of the block diagrams, and combinations of blocks in the block diagrams, may be implemented at least partially by computer program instructions. These computer program instructions may be loaded onto a general purpose computer, special purpose computer, special purpose hardware-based computer, or other programmable data processing apparatus to produce a machine, such that the instructions which execute on the computer or other programmable data processing apparatus create means for implementing the functionality of at least some of the blocks of the block diagrams, or combinations of blocks in the block diagrams discussed.
These computer program instructions may also be stored in a non-transitory computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable apparatus provide task, acts, actions, or operations for implementing the functions specified in the block or blocks.
One or more components of the systems and one or more elements of the methods described herein may be implemented through an application program running on an operating system of a computer. They may also be practiced with other computer system configurations, including hand-held devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, mini-computers, mainframe computers, and the like.
Application programs that are components of the systems and methods described herein may include routines, programs, components, data structures, etc., that may implement certain abstract data types and perform certain tasks or actions. In a distributed computing environment, the application program (in whole or in part) may be located in local memory or in other storage. In addition, or alternatively, the application program (in whole or in part) may be located in remote memory or in storage to allow for circumstances where tasks can be performed by remote processing devices linked through a communications network.
This application is a continuation-in-part of U.S. Non-Provisional application Ser. No. 17/248,484, filed Jan. 27, 2021, titled “SYSTEMS AND METHODS TO OPERATE HYDRAULIC FRACTURING UNITS USING AUTOMATIC FLOW RATE AND/OR PRESSURE CONTROL” which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,328, filed Jun. 22, 2020, titled “SYSTEMS AND METHODS TO OPERATE HYDRAULIC FRACTURING UNITS USING AUTOMATIC FLOW RATE AND/OR PRESSURE CONTROL”, U.S. Provisional Application No. 62/705,369, filed Jun. 24, 2020, titled “SYSTEMS AND METHODS PROVIDING A CONFIGURABLE STAGED RATE INCREASE FUNCTION TO OPERATE HYDRAULIC FRACTURING UNITS”, and U.S. Provisional Application No. 62/705,649, filed Jul. 9, 2020, titled “SYSTEMS AND METHODS PROVIDING A CONFIGURABLE STAGED RATE INCREASE FUNCTION TO OPERATE HYDRAULIC FRACTURING UNITS”, the disclosures of all of which are incorporated herein by reference in their entirety.
Although only a few exemplary embodiments have been described in detail herein, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the embodiments of the present disclosure. Accordingly, all such modifications are intended to be included within the scope of the embodiments of the present disclosure as defined in the following claims.
This application is a continuation of U.S. Non-Provisional application Ser. No. 17/248,485, filed Jan. 27, 2021, titled “SYSTEMS AND METHODS TO OPERATE HYDRAULIC FRACTURING UNITS USING AUTOMATIC FLOW RATE AND/OR PRESSURE CONTROL” which is a continuation-in-part of U.S. Non-Provisional application Ser. No. 17/248,484, filed Jan. 27, 2021, titled “SYSTEMS AND METHODS TO OPERATE HYDRAULIC FRACTURING UNITS USING AUTOMATIC FLOW RATE AND/OR PRESSURE CONTROL” which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,328, filed Jun. 22, 2020, titled “SYSTEMS AND METHODS TO OPERATE HYDRAULIC FRACTURING UNITS USING AUTOMATIC FLOW RATE AND/OR PRESSURE CONTROL”, U.S. Provisional Application No. 62/705,369, filed Jun. 24, 2020, titled “SYSTEMS AND METHODS PROVIDING A CONFIGURABLE STAGED RATE INCREASE FUNCTION TO OPERATE HYDRAULIC FRACTURING UNITS”, and U.S. Provisional Application No. 62/705,649, filed Jul. 9, 2020, titled “SYSTEMS AND METHODS PROVIDING A CONFIGURABLE STAGED RATE INCREASE FUNCTION TO OPERATE HYDRAULIC FRACTURING UNITS”, the disclosures of all of which are incorporated herein by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62705649 | Jul 2020 | US | |
| 62705369 | Jun 2020 | US | |
| 62705328 | Jun 2020 | US | |
| 62705649 | Jul 2020 | US | |
| 62705369 | Jun 2020 | US | |
| 62705328 | Jun 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17248485 | Jan 2021 | US |
| Child | 18442960 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17248484 | Jan 2021 | US |
| Child | 17248485 | US |
