Patent Grant
11365613
The techniques described herein relate to electric submersible pump (ESP) motor power quality. More particularly, the techniques relate to determining power quality of a motor of an ESP.
This section is intended to introduce various aspects of the art, which may be associated with one or more examples of the present techniques. This discussion is believed to assist in providing a framework to facilitate a better understanding of particular aspects of the present techniques. Accordingly, it should be understood that this section should be read in this light, and not necessarily as admissions of prior art.
Electrical submersible pumps (ESPs) can be used as an artificial lift technique in the oil and gas industry. For example, ESPs can be used to lift liquid volumes in excess of 500 barrels per day (bpd). Additionally, ESPs can have a large number of components, and some systems can reach lengths greater than 100 feet. ESPs can include one or more of an electric motor, a seal/protector, an intake, a gas separator, centrifugal pumping stages, a discharge, and a downhole sensor, for example. The ESP motor can be a three-phase alternating current (AC) induction motor. The ESP motor can also be a permanent magnet motor.
The motor of an ESP can be powered via a cable that extends to the surface and through the wellhead. The motor can be used to spin a shaft that rotates the centrifugal pump stages, increasing the pressure of the pumped fluids so they can be pumped to the surface. The seal/protector section of the ESP can handle the thermal expansion of the motor's oil, can allow the motor internals to equalize pressure in the well environment, and can carry a substantial portion of the thrust load of the ESP.
ESP run lives are generally defined by the environments in which they operate and by how they are operated. Run lives lasting two to three years are common, and some ESP systems can reach a run life of five or more years. A “good” run life may be determined by economics. ESPs can be attached to production tubing and installed with a rig. Therefore, ESP installations and workovers can be expensive, and ESP operators spend considerable efforts on ESP reliability initiatives, since each additional day of run time improves project economics.
An example provides an electric submersible pump that includes a pump, an electric motor to drive the pump, and a controller. The controller can monitor at one or more terminals of the electric motor a value relating to total harmonic distortion. The controller can also determine whether to de-rate the electric motor in response to the monitoring at the one or more terminals of the electric motor of the value relating to the total harmonic distortion.
Another example provides a method to be implemented in an electric submersible pump. The method includes monitoring, at one or more terminals of an electric motor of the electric submersible pump, a value relating to total harmonic distortion. The method also includes determining whether to de-rate the electric motor in response to the monitoring at the one or more terminals of the electric motor of the value relating to the total harmonic distortion.
In another example, one or more tangible, non-transitory machine readable media include a plurality of instructions. In response to being executed on at least one processor, the instructions can cause the at least one processor to monitor, at one or more terminals of an electric motor of the electric submersible pump, a value relating to total harmonic distortion. In response to being executed on at least one processor, the instructions can also cause the at least one processor to determine whether to de-rate the electric motor in response to the monitoring at the one or more terminals of the electric motor of the value relating to the total harmonic distortion.
The foregoing summary has outlined rather broadly the features and technical advantages of examples in order that the detailed description of the techniques that follow may be better understood. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present techniques. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the techniques described below. The novel features which are believed to be characteristic of the techniques below, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present techniques.
The foregoing and other advantages of the present techniques may become apparent upon reviewing the following detailed description and drawings of non-limiting examples of examples in which:
It should be noted that the figures are merely example of several examples of the present techniques and no limitations on the scope of the present techniques are intended thereby. Further, the figures are generally not drawn to scale, but are drafted for purposes of convenience and clarity in illustrating various aspects of the techniques.
In the following detailed description section, the specific examples of the present techniques are described in connection with some examples. However, to the extent that the following description is specific to a particular embodiment or a particular use of the present techniques, this is intended to be for example purposes only and simply provides a description of some examples. Accordingly, the techniques are not limited to the specific examples described below, but rather, it includes all alternatives, modifications, and equivalents falling within the true spirit and scope of the appended claims.
At the outset, and for ease of reference, certain terms used in this application and their meanings as used in this context are set forth. To the extent a term used herein is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in at least one printed publication or issued patent. Further, the present techniques are not limited by the usage of the terms shown below, as all equivalents, synonyms, new developments, and terms or techniques that serve the same or a similar purpose are considered to be within the scope of the present claims.
“Drilling” as used herein may include, but is not limited to, rotational drilling, slide drilling, directional drilling, non-directional (straight or linear) drilling, deviated drilling, geosteering, horizontal drilling, and the like. The drilling method may be the same or different for the offset and uncased intervals of the wells. Rotational drilling may involve rotation of the entire drill string, or local rotation downhole using a drilling mud motor, where by pumping mud through the mud motor, the bit turns while the drill string does not rotate or turns at a reduced rate, allowing the bit to drill in the direction it points.
A “well” or “wellbore” refers to holes drilled vertically, at least in part, and may also refer to holes drilled with deviated, highly deviated, and/or horizontal sections of the wellbore. The term also includes wellhead equipment, surface casing, intermediate casing, and the like, typically associated with oil and gas wells.
“De-rate” or “de-rating” refers to an adjustment of devices such as electrical devices, for example, in order to provide for longer device life. For example, the term can refer to adjusting a speed of the device (for example, adjusting a speed of an electric motor). For example, the term can refer to operation of a device (for example, operation of an electric motor) at less than its rated maximum capability in order to prolong its life. For example, the term can relate to operation below a maximum or typical power rating, current rating, or voltage rating, or lowering an operation parameter (such as, for example, lowering power, lowering current, or lowering voltage). The term may refer generally to changing an operating speed of a system, or stopping operation (for example, stopping operation in order to fix a problem).
Some techniques described herein relate to determining power quality of a motor or an electric submersible pump (ESP). For example, some techniques relate to determining power quality of a motor of an ESP based on one or more of total harmonic distortion (THD), maximum voltage, maximum spikes (for example, ringing), voltage change over time, balance and/or imbalance, current balance and/or imbalance, voltage balance and/or imbalance, etc. According to examples described herein, techniques are presented of a controller to monitor at one or more terminals of an electric motor of an electric submersible pump (ESP) a value relating to total harmonic distortion. The controller can also determine whether to de-rate the electric motor in response to the monitoring at the one or more terminals of the electric motor (for example, monitoring at the one or more terminals of the value relating to the total harmonic distortion). In some embodiments, measurement of power quality (PQ) at an electric motor of an ESP can influence one or more of motor de-rating, insight on insulation design change, variable speed drive (VSD) operation change, frequency change away from a resonant excitation frequency, surface filter design and/or performance, etc.
In some embodiments, an electrical submersible pump (ESP) can be used as an efficient and reliable artificial-lift to lift moderate to high volumes of fluids from wells (or wellbores). Such an ESP can include a tubing-hung unit with downhole components including, for example, one or more of a multistage centrifugal pump (for example, in some embodiments, with either an integral intake or a separate intake), a three-phase induction motor, a sensor, and a seal-chamber section. The ESP system can also include a power cable coupling the downhole components to surface controls. In some embodiments, ESP systems can be used to pump a variety of fluids, including, for example, crude oil, brine, liquid petroleum products, disposal or injection fluids, fluids containing free gas, some solids or contaminants, and/or CO2 and H2S gases or treatment chemicals, among others. Only surface control equipment and the power cable running from the surface controller to the wellhead might be visible. The surface controller may be provided in an outdoor weatherproof version or an indoor version for placement in a building or a container. The surface control equipment might be located within a minimum recommended distance from the wellhead, or can be located miles away from the wellhead.
The motor 108 and pump 102 can run on a production string connected back to the controller 112 (and to a transformer) via electric power cable 114. In some embodiments, motor 108 is a three-phase alternating current (AC) induction or permanent magnet motor and is powered via cable 114. The motor 108 can drive pump 102. For example, in some embodiments, motor 108 can spin a shaft that rotates centrifugal pump stages of pump 102 to increase a pressure of the pumped fluids. The ESP pump 102 can pump intermittently or continuously.
As discussed above, sensor 110 can be a downhole sensor installed in the ESP. Sensor 110 can measure one or more of intake/discharge pressures, intake temperature, motor temperature, vibration, and/or flow, for example. In some embodiments, sensor 110 can be coupled to the Y-point (or triple point, or zero voltage point) of motor 108. Sensor 110 can be can be powered from a “slipstream” of electricity that is being delivered to run the ESP and/or motor 108, for example, via power cable(s) 114. Sensor 110 communications may be modulated (or piggy-backed) onto the ESP power signal (for example, the ESP power signal provided via power cable 114) and can be read at the surface (for example, at controller 112).
Harmonics can become an issue with ESP motors. For example, if the phases of the motor get out of sync, more power can end up going to one coil than to other coils and the pump can end up being destroyed. Therefore, in some embodiments, the motor is de-rated (or downrated) to avoid this situation. In some embodiments, a system can be used that includes active filter circuitry that can perform mitigation between the phases by lowering the amount of phase imbalance. In some embodiments, an indication can be sent to the surface to alert the surface controller that a level of imbalance is occurring so that a surface motor controller can do something about the imbalance. In some embodiments, an indication can be provided relating to power quality of an ESP motor (relating to, for example, one or more total harmonic distortion (THD), maximum spikes, ringing, imbalance, etc.) In some embodiments, a measurement and/or indication of power quality of an ESP motor can influence one or more of motor de-rating, insight on insulation design change, variable speed drive (VSD) operation change, frequency change away from resonant excitation frequency, surface filter design and/or performance, etc. In some embodiments, an indication can be provided that results in design changes such as, for example, increasing a motor and/or insulation rating, cable design changes (for example, round vs. flat, transpositional splices, etc.), and/or VSD output filter performance evaluation. In some embodiments, de-rating or downrating of the motor 108 can include, for example, adjustment of the motor in order to provide for longer device life, adjustment of a speed of the motor, operating the motor at less than its rated maximum capability, operating the motor below a maximum or typical power rating, current rating, or voltage rating, lowering an operation parameter of the motor (such as, for example, lowering power, current, and/or voltage supplied to the motor), changing an operating speed of the motor, and/or stopping operation of the motor.
An ESP driven by an electric motor can be susceptible to poor power quality issues (for example, poor output power quality issues). Power readings can be measured at the surface at a variable speed drive (VSD) outlet or another suitable port. Voltage and amperage values can be tracked (for example, at a VSD outlet) in a relatively simple manner. However, dynamic output power quality is more difficult to measure, since a 10 kHz or higher sampling frequency may be required to assess the relevant harmonics. This can be particularly difficult using VSDs, since they re-form the power they receive to provide variable frequency power to another device such as an ESP motor. VSD input power quality specifications are well known, for example, as outlined in the Institute of Electrical and Electronic Engineers (IEEE) 519 spec. However, output power specifications are not as well defined or stringent, and ESP motors are affected by a VSD's output power. Poor power quality (harmonics) can lead to excessive motor heating, insulation damage, bearing fluting, and other issues that can decrease the run life of an ESP.
Output power quality could be measured at the surface with modeling assistance. However, ESP VSDs typically output to a step-up transformer, and a measurement of total harmonic distortion (THD) would likely need to be at the output (high-voltage) side of the transformer. This high-voltage could be in a range of around 3-5 kV, which makes measurement a challenge. If the measurement point were on the low voltage side, the relatively high current (for example, several hundred Amps) could also be an issue, and the transformer effects would likely require modeling. Such a surface measurement would need to be re-processed to account for the additional capacitance in the lengthy power cable from the measurement point to the ESP, and changes in the power line capacitance from any initial assumptions would be difficult to account for. Improper ramp-up voltages (rise times) and ringing can be amplified by cable characteristics, resulting in damaging spikes at the ESP motor. Additionally, measurement at the surface power supply do not take the downstream electrical system into account, and cables/penetrators are known to fail.
If a total harmonic distortion (THD) such as, for example, total harmonic distortion on the voltage (THDv) or total harmonic distortion on the current (THDi), is greater than a threshold (for example, is greater than 3%) at a motor's terminals, it is advantageous to de-rate (or downrate) the motor. For example, the National Electrical Manufacturers Association (NEMA) MG-1 specification indicates that if Total Harmonic Distortion-Voltage (THDv) is >3% at a motor's terminals, the motor should be de-rated. However, in the case of an ESP motor, measurement of a VSD's output harmonics at the surface is not the best location for understanding the effect of power quality on the ESP motor. The harmonics in a line are dependent on the quality of the power waveform, the operational frequency, and the length (and/or capacitance) of the line. In some embodiments, the THD (for example, the THDv or the THDi) are measured at the ESP motor, it can be determined if (or when) the motor is in danger due to poor power quality. For example, in some embodiments, the THD can be monitored at the ESP motor terminals. The downhole system can then be isolated and the issue can be solved before an electrical-related failure occurs. Such a measurement of the THD can also be provided as a THD baseline, and THD values can be monitored over time to determine if characteristics of the electrical system have changed.
System 300 includes a motor 308 and a controller 320. A power cable includes lines P1, P2, and P3, which may be three phase wire lines (for example, three phase copper wire lines), and/or may be the same as (or similar to) lines included in power cable 114 of
In some embodiments, controller 320 is included in a sensor (for example, is included in a sensor such as sensor 110 of the ESP of
In some embodiments, controller 320 is a total harmonic distortion (THD) controller that can control the ESP motor (for example, can control the motor 108 or the motor 308) in response to THD (for example, based on measurements received from wires P1, P2, and/or P3). In some embodiments, controller 320 can control the ESP motor directly. In some embodiments, controller 320 can send a signal to a surface controller (for example, controller 112) so that the surface controller can control the ESP motor based on the signal sent from downhole controller 320.
In some embodiments, a power connection to provide power to controller 320 is a same power connection as a power connection to an ESP sensor (for example, at the bottom of an ESP motor such as motor 308). In some embodiments, a power connection to provide power to controller 320 is at an ESP pothead (for example, at a pothead connector connecting the motor 308 to a power cable). In some embodiments, a power connection to provide power to controller 320 is above an ESP pothead (for example, above a pothead connector connecting the motor 308 to a power cable). In some embodiments, a dedicated power source may be provided from the surface to controller 320 (for example, via one or more power cables).
In some embodiments, communications between controller 320 and devices at the surface are implemented using a same path as the ESP sensor uses for communications with devices at the surface (for example, using DC communication techniques impressed on an AC power cable). In some embodiments, communications between controller 320 and devices at the surface are implemented using a different path from the one that the ESP sensor uses for communications with devices at the surface (for example, using an independent communications path such as a high data-rate fiber optic line or some other communications line separate from the ESP power cable.
In some embodiments, data is transmitted by controller 320 to the surface (for example, to a surface controller) using all high-frequency data transmission (for example, in some embodiments, can transmit data with a 10 kHz or higher sampling frequency). In some embodiments, data is computed locally by controller 320, and all data or some data (for example, some data such as a subset of the locally computed data) is transmitted to the surface. In some embodiments, high frequency data (for example, in some embodiments, data with a 10 kHz or higher sampling frequency) is stored locally at or near the controller 320, which can be pulled for analysis and transmission to the surface. In some embodiments, the high frequency data may be compressed (for example, data with a 10 kHz or higher sampling frequency is compressed, and/or is compressed locally and/or at or near controller 320) before it is stored locally. In some embodiments, the high frequency data may be compressed and then transmitted at a lower frequency (for example, within communication bandwidth constraints).
In some embodiments, the controller 320 is a downhole power quality controller included in a sensor of an ESP (for example, included in sensor 110 of the ESP of
In some embodiments, controller 320 can provide power conditioning. In some embodiments, controller 320 can implement power conditioning features including, for example, one or more of maximum voltage regulation, minimum voltage regulation, minimum voltage rise time regulation, active harmonics filter, and/or passive harmonics filter. In some embodiments, power conditioning can be implemented using a sensor (for example, sensor 110) and/or a controller (for example, controller 320). This may be implemented, for example, by detecting maximum rise of voltage spikes and/or change of voltage over time (dV/dt).
Controller 320 can be used to regulate to a maximum and/or minimum rise time. This can be implemented, for example, using passive components to avoid insulation-damaging events. In some embodiments, an active harmonic filter can be used to inject equal amounts of harmonic currents at opposite phases, for example.
In some embodiments, controller 320 can calculate one or more THD values at terminals of motor 308 (for example, including one or more THDv and/or one or more THDi values) and can adjust a speed of motor 308 if the calculated THD value(s) are not within a particular tolerance. In some embodiments, controller 320 can measure each phase of the motor 308, calculate a Fourier Transform for each phase, calculate THD for each phase, calculate a total THD, compare THD values to de-rated values (or de-rating values, downrated values, or downrating values) for the motor 308, determine whether the motor is to be de-rated (downrated) based on the compared values (for example, by determining whether the THD values are within a tolerance value), calculate a de-rated value (downrated value), and/or adjust a speed of the motor 308 based on a de-rated value (downrated value). In some embodiments, adjusting a speed of the motor 308 in this manner can be referred to as de-rating the motor, downrating the motor, etc. In some embodiments, de-rating or downrating of the motor 308 can include, for example, adjustment of the motor in order to provide for longer device life, adjustment of a speed of the motor, operating the motor at less than its rated maximum capability, operating the motor below a maximum or typical power rating, current rating, or voltage rating, lowering an operation parameter of the motor (such as, for example, lowering power, current, and/or voltage supplied to the motor), changing an operating speed of the motor, and/or stopping operation of the motor.
In some embodiments, controller 320 can calculate THD values at the terminals of motor 308 and can adjust the motor directly. In some embodiments, by using controller 320, which is located downhole at the ESP rather than at the surface, problems associated with performing similar functions at the surface (such as induction issues relating to the long length of any communication lines) do not occur.
At 402, flow 400 measures each phase of a motor of an ESP. At 404, a Fourier Transform is calculated for each phase. Total harmonic distortion (THD) is calculated for each phase at 406. For example, in some embodiments, THDv and/or THDi is calculated for each phase at 406. A total THD is calculated at 408. For example, a total THD is calculated at 408 based on the THD calculated for each phase at 404. One or more calculated THD values are compared with de-rating values (or de-rated values, downrated values, downrating values, etc.) for an ESP motor at 410. For example, one or more THD calculated values are compared with one or more tolerance values at 410 (for example, in some embodiments, compared with a 3% tolerance value). A determination is made at 412 as to whether an ESP motor is to be downrated (de-rated). The determination at 412 can be made, for example, based on the comparison implemented at 410. If the ESP motor is not to be downrated (de-rated) at 412, flow 400 returns to 402. If the ESP motor is to be downrated (de-rated) at 412, a downrated (de-rated) value is calculated at 414. For example, the downrated (de-rated) value may be calculated at 414 based on the values compared at 410. At 416, a speed of an ESP motor is adjusted to the downrated value (de-rated value) calculated at 414. Flow then returns to 402. In some embodiments, adjusting a speed of an ESP motor in this manner can be referred to as de-rating the motor, or downrating the motor, etc. In some embodiments, de-rating or downrating of the motor used in reference to 410, 412, 414, and/or at 416 can include, for example, adjustment of the motor in order to provide for longer device life, adjustment of a speed of the motor, operating the motor at less than its rated maximum capability, operating the motor below a maximum or typical power rating, current rating, or voltage rating, lowering an operation parameter of the motor (such as, for example, lowering power, current, and/or voltage supplied to the motor), changing an operating speed of the motor, and/or stopping operation of the motor.
Computing device 502 can include a processor 504, memory 506, and storage 508. Computing device 502 also can include a system interconnect 510 that can be used to connect various elements of the computing device 502. Storage 508 can store instructions 512 that can be executed by a processor such as processor 504 to implement voltage measurement control, instructions 514 that can be executed by a processor such as processor 504 to implement Fourier Transform control, instructions 516 that can be executed by a processor such as processor 504 to implement downrating (or de-rating) comparison, instructions 518 that can be executed by a processor such as processor 504 to implement motor speed control, and instructions 520 that can be executed by a processor such as processor 504 to direct communications. In some embodiments, processor 504 can be used to de-rate or downrate a motor, which can include, for example, adjustment of the motor in order to provide for longer device life, adjusting a speed of the motor, operating the motor at less than its rated maximum capability, operating the motor below a maximum or typical power rating, current rating, or voltage rating, lowering an operation parameter of the motor (such as, for example, lowering power, current, and/or voltage supplied to the motor), changing an operating speed of the motor, and/or stopping operation of the motor.
Computing device 502 may also include one or more analog to digital converters (AD converters) 522, filter circuitry interface 524, power supply 526, and network/signal interface 528 (for example, a network interface, NIC, or signal interface). System 500 can also include electrical measurement circuitry 532 (for example, voltage measurement circuitry and/or other electrical measurement circuitry) that may be coupled to power cable lines P1, P2, and P3 (for example, to power cable lines P1, P2, and P3 illustrated in
The computing device 502 may include a processor 504 that is adapted to execute stored instructions (for example, instructions stored in processor 504, instructions stored in memory 506, and/or instructions stored in storage 508). Memory device 506 (or storage 506) can store instructions that are executable by the processor 504. The processor 504 can be a single core processor, a multi-core processor, a computing cluster, or any number of other configurations. The memory device 506 can be a memory device or a storage device, and can include volatile storage, non-volatile storage, random access memory, read only memory, flash memory, or any other suitable memory or storage system. The instructions that are executed by the processor 504 may also be used to implement any of the techniques illustrated and/or described herein. In some embodiments, processor 504 may include the same or similar features or functionality as, for example, various controllers or agents in this disclosure.
The processor 504 may be linked through the system interconnect 510 (e.g., PCI®, PCI-Express®, NuBus, etc.) to memory 506, storage 508, AD converters 522, filter circuitry interface 524, power supply 526, and network/signal interface 528, for example. Analog-Digital converters 522 may be adapted to connect the computing device 502 to electrical measurement circuitry 532. Filter circuitry interface 524 may be adapted to connect computing device 502 to active filter circuitry 534. Power supply 526 can receive power from the neutral point 536 to power the computing device 502. Network/signal interface 528 may be adapted to connect the computing device 502 to the neutral point. In some embodiments, network/signal interface 528 may be a network interface controller (also referred to herein as a NIC) that may be adapted to connect the computing device 502 through a system interconnect to a network (not depicted), or to a surface controller via a power cable, for example. In some embodiments, the network (not depicted) may be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, among others.
In some embodiments, the processor 504 may also be linked through the system interconnect 510 to storage device 508, and storage device 508 can include a hard drive, a solid-state drive (SSD), a magnetic drive, an optical drive, a USB flash drive, an array of drives, or any other type of storage, including combinations thereof. In some embodiments, the storage device 508 can include any suitable applications that can be used by processor 504 to implement any of the techniques described herein. In some embodiments, storage 508 stores instructions 512, 514, 516, 518, and/or 520 that are executable by the processor 504. In some embodiments, the storage device 508 can include a basic input/output system (BIOS).
In some embodiments, electrical measurement circuitry 532 can include induction coils (or inductors) on each of the power lines P1, P2, and P3. Electrical measurement circuitry 532 is coupled to wires P1, P2, and P3 and can be used to measure one or more characteristic of the wire such as one or more of voltage, current, frequency, induction, and/or harmonics, etc. (for example, using a separate induction coil, or a separate inductor, around each of the power line wires P1, P2, and P3). In some embodiments, active filter interface 524 and active filter circuitry 534 can be used in a situation where active intervention occurs on the phases.
It is to be understood that the block diagram of
In some embodiments, computing device 502 may include one or more processors. In some embodiments, storage device 508 can be one or more tangible, non-transitory computer readable media that can be included in computing device 502, or can be separate media from computing device 502. The one or more tangible, non-transitory, computer-readable media may be accessed by the processor(s) over a computer interconnect. Furthermore, the one or more tangible, non-transitory, computer-readable media may include instructions (or code) to direct the processor(s) to perform operations to implement any of the techniques as illustrated and/or described herein. In some embodiments, the processor(s) can perform some or all of the same or similar functions that can be performed by other elements described herein using instructions (code) included on the media. In some embodiments, the one or more of processor(s) may include the same or similar features or functionality as, for example, various controllers, units, or agents, etc. described in this disclosure. In some embodiments, the one or more processor(s), interconnect, and/or media may be included in computing device 502. It is to be understood that any suitable number of software components may be included within the one or more tangible, non-transitory computer-readable media, depending on the specific application.
System 600 includes a controller 620. In some embodiments, controller 620 can be the same as or similar to controller 320. System 600 also includes a neutral point 622 and coils 624 of a motor (for example, of an ESP motor). System 600 illustrates sensor measurement of current, voltage, and/or total harmonic distortion (THD) in accordance with some embodiments. Inductors 632 each measure the current coming out of each phase of the motor. Resistors 634 can be used across each of the inductors 632 to provide a respective voltage to controller 620. In this manner, electrical signals can be provided to controller 620 so that controller 620 can perform phase calculations for each of the phases in accordance with some embodiments. It is noted that the 1, 2 and 3 numbers in
System 700 includes a controller 720. In some embodiments, controller 720 can be the same as or similar to controller 320. System 700 also includes a neutral point 722 and coils 724 of a motor (for example, of an ESP motor). System 700 illustrates sensor measurement of current, voltage, and/or total harmonic distortion (THD) in accordance with some embodiments. Resistors 732 can each be coupled between one of the power lines and controller 720. In this manner, electrical signals can be provided to controller 720 so that controller 720 can perform phase calculations for each of the phases in accordance with some embodiments. It is noted that the 1, 2 and 3 numbers in
System 800 includes a neutral point 822 and coils 824 of a motor (for example, of an ESP motor). System 800 illustrates communications 826 (for example, a high frequency communications unit such as, for example, a unit that can provide communications with a 10 kHz or higher sampling frequency) and network/signal interface 828 (for example, a network interface controller or NIC). In some embodiments, communications 826 can be a filter that connects to the neutral point 822 (or Y point, triple point, etc.) and can impose high frequency signaling (for example, in some embodiments, can impose signaling with a 10 kHz or higher sampling frequency) on the neutral point 822 to communicate (for example, to the surface) via the power cable signal lines P1, P2, and P3 (for example, using Ethernet over Power communications).
System 900 includes a controller 920. In some embodiments, controller 920 can be the same as or similar to controller 920. System 900 also includes a neutral point 922 and coils 924 of a motor (for example, of an ESP motor). System 900 illustrates sensor measurement of current, voltage, and/or total harmonic distortion (THD) in accordance with some embodiments. Inductors 932 each measure the current coming out of each phase of the motor. In some embodiments, a current detection system may be included in controller 920 to detect current at each of the phases. In some embodiments, resistors (not illustrated in
Various components discussed in this specification may be implemented using software components. These software components may be stored on the one or more tangible, non-transitory, computer-readable media 1000, as indicated in
It is to be understood that any suitable number of software components may be included within the one or more tangible, non-transitory computer-readable media 1000. Furthermore, any number of additional software components shown or not shown in
The various techniques and/or operations described herein (for example, in reference to any one or more of
Reference in the specification to “one embodiment” or “an embodiment” or “some embodiments” of the disclosed subject matter means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosed subject matter. Thus, the phrase “in one embodiment” or “in some embodiments” may appear in various places throughout the specification, but the phrase may not necessarily refer to the same embodiment or embodiments.
While the present techniques may be susceptible to various modifications and alternative forms, the example examples discussed above have been shown only by way of example. However, it should again be understood that the present techniques are not intended to be limited to the particular examples disclosed herein. Indeed, the present techniques include all alternatives, modifications, and equivalents falling within the true spirit and scope of the appended claims.
The systems and methods disclosed herein are applicable to the oil and gas industries.
It is believed that the disclosure set forth above encompasses multiple distinct inventions with independent utility. While each of these inventions has been disclosed in its preferred form, the specific embodiments thereof as disclosed and illustrated herein are not to be considered in a limiting sense as numerous variations are possible. The subject matter of the inventions includes all novel and non-obvious combinations and subcombinations of the various elements, features, functions, and/or properties disclosed herein. Similarly, where the claims recite “a” or “a first” element or the equivalent thereof, such claims should be understood to include incorporation of one or more such elements, neither requiring nor excluding two or more such elements.
It is believed that the following claims particularly point out certain combinations and subcombinations that are directed to one of the disclosed inventions and are novel and non-obvious. Inventions embodied in other combinations and subcombinations of features, functions, elements, and/or properties may be claimed through amendment of the present claims or presentation of new claims in this or a related application. Such amended or new claims, whether they are directed to a different invention or directed to the same invention, whether different, broader, narrower, or equal in scope to the original claims, are also regarded as included within the subject matter of the inventions of the present disclosure.
This application claims the benefit of U.S. Provisional Application 62/776,738 filed Dec. 7, 2018 entitled “Electrical Submersible Pump Motor Adjustment,” the entirety of which is incorporated by reference herein.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5959431 | Xiang | Sep 1999 | A |
| 6328102 | Dean | Dec 2001 | B1 |
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