Patent Application
20130233542
None.
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the recovery of hydrocarbons from subterranean formations, it is often necessary to apply various treatment procedures to the well to improve the life and/or the productivity of the well. Examples of the treatment procedures include, but are not limited to, cementing, gravel packing, hydraulic fracturing, and acidizing. Particularly, in formations with low permeability, it is common to fracture the hydrocarbon-bearing formation to provide flow channels. These flow channels facilitate movement of the hydrocarbons to the wellbore so that the hydrocarbons may be recovered from the well.
Fracturing has historically been an operation where the materials that were going to be pumped were prepared on location. Deliveries of liquids, proppant, and chemicals were all accomplished before the job began. Specialized storage equipment was normally used for handling the large quantities of materials, such as sand chiefs made by Besser. Similarly, specialized tanks such as water tanks and frac tanks were used for liquids. These tanks are typically the largest possible volume that can be legally transported down the road without a permit. Once everything was ready, more specialized equipment was used to prepare gel, mix in proppant, dose with chemicals, and deliver the resulting fluid to the fracturing pumps under positive pressure. All of these specialized well site vehicles and units are expensive, and lead to a very large footprint on location.
Referencing to
It can be seen from the operation 100 that various equipment is required at the location, including the water tanks, a chemical truck or other vehicle carrying the polymer and/or other additives, a continuous mixer, a proppant vehicle (sand truck, sand chief, etc.), a blender (e.g. a POD blender), and various fracturing pumps. Alternatively, the continuous mixer may be replaced with equipment and time to batch mix the fracturing fluid into the water tanks in advance, increasing the operational cost, reducing the flexibility of the fracturing treatment, and increasing the physical footprint of the fracturing operation. Also, a large amount of water is needed for a fracturing operation, which leads to the generation of a large amount of flowback fluid. The storage, management, and disposal of the flowback fluid are expensive and environmentally challenging.
The current application addresses one or more of the problems associated with the conventional fracturing operation.
In certain embodiments, a method is disclosed which includes preparing a pump-ready fracturing fluid, delivering the pump-ready fracturing fluid to a location operationally coupled to a wellsite, and pumping the fracturing fluid downhole to fracture a subterranean formation. The pump-ready fracturing fluid may be a fluid that is directly provideable to a pump for high pressure delivery. The pump-ready fracturing fluid may be further conditioned, as additional additives, liquid, etc. may be added to the pump-ready fracturing fluid before or during a formation treatment operation. The method may further include providing the pump-ready fracturing fluid to a positive displacement pump inlet, and pumping the pump-ready fracturing fluid into a wellbore. The method may further include combining pump-ready fracturing fluid sources in a manifold, pressurizing the pump-ready fracturing fluid, and/or providing shear or residence time conditions upstream of the positive displacement pump inlet. In certain embodiments the method includes hydrating, shearing, or conditioning the pump-ready fracturing fluid before the providing the pump-ready fracturing fluid to the positive displacement pump inlet. In certain embodiments, the method includes recirculating a sump side of the positive displacement pump during the pumping. In certain embodiments, the method includes pumping an alternate fluid pill during the pumping, for example alternating to the fluid pill and then back to the pump-ready fracturing fluid.
In certain embodiments, a system is disclosed which includes a regional blending facility that prepares pump-ready treatment fluid for use at a wellsite. The regional blending facility may include bulk receiving facilities that receive and store a number of particle types, each of the number of particle types having a distinct size modality. The facility may include a batching vessel and a bulk moving device to transfer particle types between the bulk receiving facilities and the batching vessel. The facility may further include a mixer that receives batched material from the batching vessel and provides a mixed product fluid, a product storage that stores the mixed product, and a transportation device that delivers the prepared fluid to a wellsite for usage.
In certain embodiments, the bulk receiving facilities may include a mobile receiver that positions under a bulk material carrier, a below grade receiver that allows a bulk material carrier to be positioned thereabove, a depressurized receiver that pneumatically receives bulk material, and/or a receiving area that receives and stores a bulk material carrier in the entirety. In certain embodiments, the bulk moving device may include a pneumatic system utilizing heated air and/or a mechanical bulk transfer device. In certain embodiments, the batching vessel includes a portion of a batching device, wherein the batching device includes an accumulative batch measurement device, a decumulative batch measurement device, and/or an intermediary vessel sized to be larger than a batch size, where the batching device includes structures for accumulating an amount larger than the batch size in the intermediary vessel, and decumulating the batch size from the intermediary vessel. An example batching device may additionally or alternatively include a number of batch vessels each receiving one of a plurality of distinct product modalities, or each receiving a distinct mix of product modalities.
An example mixing device includes a feed screw operationally coupling the batching vessel to the product storage, a feed screw operationally coupling the batching vessel to the product storage, the feed screw including a mixing feature, and/or a feed screw operationally coupling the batching vessel to the product storage. The feed screw may include a mixing feature, wherein the mixing feature comprises at least one of a tab, a slot, and a hole. Additionally or alternatively, the mixing device may include a drum mixer, a ribbon blender, a twin shaft compulsory mixer, a planetary mixer, a pug mill, a blender (e.g. a POD blender), and/or a colloidal mixer.
In certain embodiments, the product storage may include tanks having a portion with a reduced cross-sectional area, a vessel positioned to gravity feed the wellsite transportation device, a vessel having a head tank, a pressurizable storage vessel, and/or an agitation device. In certain embodiments, the wellsite transportation device is sized in response to a density of the mixed treatment fluid. An example wellsite transportation device may be deployable as a vertical silo, a trailer having an elevated portion, a plurality of trailers having coupled portions, and/or an unfolding trailer.
In certain embodiments, a method is disclosed for preparing a pump-ready fluid. An example method includes providing a carrier fluid fraction, providing an immiscible substance fraction including a plurality of particles such that a packed volume fraction (PVF) of the particles exceeds 64%, mixing the carrier fluid fraction and the immiscible substance fraction into a treatment slurry, and providing the treatment slurry to a storage vessel. The immiscible substance fraction exceeds 59% by volume of the treatment slurry. The method may further include positioning the storage vessel at a wellsite, and/or positioning the storage vessel vertically, for example where the storage vessel is a vertical silo. The method may further include fluidly coupling the storage vessel to a pump intake, and treating a wellbore with the treatment slurry. In certain embodiments, the method further includes providing all of a proppant amount for the treating of the wellbore within the treatment slurry. The example method in certain embodiments includes transferring the treatment slurry to a transportation device.
In certain further embodiments, the method includes performing the operations of: providing the carrier fluid fraction, providing the immiscible substance fraction, and mixing the carrier fluid fraction, at a facility remote from a wellsite. The facility includes a powered device to perform at least one of the providing and mixing operations, and the example method further includes capturing a carbon dioxide emission of the powered device. An example capturing operation includes capturing the carbon dioxide emission by injecting the carbon dioxide into a disposal well operationally coupled to the facility. In certain embodiments, the method further includes capturing and disposing of a treatment fluid byproduct at the facility remote from the wellsite. In certain further embodiments, the method includes selecting a location for the facility remote from the wellsite by selecting a location having an enhanced environmental profile relative to an environmental profile of the wellsite, where the wellsite is an intended treatment target for the treatment slurry.
These and other features and advantages will be better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings.
For the purposes of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the claimed subject matter is thereby intended, any alterations and further modifications in the illustrated embodiments, and any further applications of the principles of the application as illustrated therein as would normally occur to one skilled in the art to which the disclosure relates are contemplated herein.
The schematic flow descriptions which follow provide illustrative embodiments of performing procedures for preparing and delivering treatment fluid or treatment fluid precursor to a wellsite. Operations illustrated are understood to be examples only, and operations may be combined or divided, and added or removed, as well as re-ordered in whole or part, unless stated explicitly to the contrary herein. Certain operations illustrated may be implemented by a computer executing a computer program product on a computer readable medium, where the computer program product comprises instructions causing the computer to execute one or more of the operations, or to issue commands to other devices to execute one or more of the operations.
In particular, it should be understood that, although a substantial portion of the following detailed description is provided in the context of oilfield hydraulic fracturing operations, other oilfield operations such as cementing, gravel packing, etc. can utilize and benefit from the disclosure of the current application as well. All variations that can be readily perceived by people skilled in the art after reviewing the current application should be considered as within the scope of the current application.
As used herein, the term “treatment fluid” should be understood broadly. Treatment fluids include liquid, a solid, a gas, and combinations thereof, as will be appreciated by those skilled in the art. A treatment fluid may take the form of a solution, an emulsion, a slurry, or any other form as will be appreciated by those skilled in the art. In some embodiments, the treatment fluid may contain a carrying medium and a substance that is substantially immiscible therein. The carrying medium may be any matter that is substantially continuous under a given condition. Examples of the carrying medium include, but are not limited to, water, hydrocarbon, gas, liquefied gas, etc. In some embodiments, the carrying medium may optionally include a viscosifying agent. Some non-limiting examples of the carrying medium include hydratable gels (e.g. guars, poly-saccharides, xanthan, diutan, hydroxy-ethyl-cellulose, etc.), a cross-linked hydratable gel, a viscosified acid (e.g. gel-based), an emulsified acid (e.g. oil outer phase), an energized fluid (e.g. an N2 or CO2 based foam), a viscoelastic surfactant (VES) viscosified fluid, and an oil-based fluid including a gelled, foamed, or otherwise viscosified oil. Additionally, the carrier medium may be a brine, and/or may include a brine. The substantially immiscible substance can be any matter that only dissolves or otherwise becomes a constituent portion of the carrying fluid under a given condition for less than 10%, sometimes less than 20%, of the weight of substance when it is not in contact of the carrying medium. Examples of substantially immiscible substance include, but are not limited to, proppant, salt, emulsified hydrocarbon droplets, etc.
As used herein, the term “pump-ready” should be understood broadly. In certain embodiments, a pump-ready treatment fluid means the treatment fluid is fully prepared and can be pumped downhole without being further processed. In some other embodiments, the pump-ready treatment fluid means the fluid is substantially ready to be pumped downhole except that a further dilution may be needed before pumping or one or more minor additives need to be added before the fluid is pumped downhole. In such an event, the pump-ready treatment fluid may also be called a pump-ready treatment fluid precursor. In some further embodiments, the pump-ready treatment fluid may be a fluid that is substantially ready to be pumped downhole except that certain incidental procedures are applied to the treatment fluid before pumping, such as low-speed agitation, heating or cooling under exceptionally cold or hot climate, etc.
In certain embodiments, the pump-ready treatment fluid is a high particle content fluid where the volume fraction of the carrying medium in the pump-ready treatment fluid is less than 60% of the total volume of the pump-ready treatment fluid. Stated in another way, in such embodiments, the volume fraction of the immiscible substance in the pump-ready treatment fluid is equal to or more than 40% of the total volume of the pump-ready treatment fluid. In certain other embodiments, the volume fraction of the carrying medium is less than 50% of the pump-ready treatment fluid, with the immiscible substance making up 50% or more volume fraction of the pump-ready treatment fluid. In certain additional embodiments, the pump-ready treatment fluid has a volume fraction of the carrying medium that is less than 40% and a volume fraction of the immiscible substance that is 60% or more. In certain further embodiments, the pump-ready treatment fluid has a volume fraction of the carrying medium that is less than 30% and a volume fraction of the immiscible substance that is 70% or more. In certain even further embodiments, the pump-ready treatment fluid has a volume fraction of the carrying medium that is less than 20% and a volume fraction of the immiscible substance that is 80% or more. In certain additionally further embodiments, the pump-ready treatment fluid has a volume fraction of the carrying medium that is less than 10% and a volume fraction of the immiscible substance that is 90% or more.
In some cases, the immiscible substance contains a single particle size or particle size distribution (i.e. monomode). In some other cases, the immiscible substance contains a plurality of particles having distinct sizes or particles size distributions (i.e. multi-modes). As used herein, the terms distinct particle sizes, distinct particle size distribution, or multi-modes or multimodal, mean that each of the plurality of particles has a unique volume-averaged particle size distribution (PSD) mode. That is, statistically, the particle size distributions of different particles appear as distinct peaks (or “modes”) in a continuous probability distribution function. For example, a mixture of two particles having normal distribution of particle sizes with similar variability is considered a bimodal particle mixture if their respective means differ by more than the sum of their respective standard deviations, and/or if their respective means differ by a statistically significant amount. In certain embodiments, the immiscible substance contains a bimodal mixture of two particles; in certain other embodiments, the immiscible substance contains a trimodal mixture of three particles; in certain additional embodiments, the immiscible substance contains a tetramodal mixture of four particles; in certain further embodiments, the immiscible substance contains a pentamodal mixture of five particles.
In some embodiments, the immiscible substance has a packed volume fraction (PVF) of 64% or higher. As used herein, the term “packed volume fraction, or PVF, means a theoretical calculation of the most likely configuration of particles of various sizes. It can be defined as the volume occupied by the particles divided by the total volume of the particles plus the void space between the particles. In certain other embodiments, the immiscible substance has a packed volume fraction (PVF) of 74% or higher. In certain additional embodiments, the immiscible substance has a packed volume fraction (PVF) of 87% or higher.
As used herein, the terms “particle” or “particulate” should be construed broadly. In certain embodiments, the particle or particulate is substantially spherical. In some certain embodiments, the particle or particulate is not substantially spherical. For example, the particle or particulate may have an aspect ratio, defined as the ratio of the longest dimension of the particle to the shortest dimension of the particle, of more than 2, 3, 4, 5 or 6. Examples of such non-spherical particles include, but are not limited to, fibers, flakes, discs, rods, stars, etc. Similarly, in some embodiments, the particle(s) or particulate(s) of the current application are solid such as proppant, sands, ceramics, crystals, salts, etc.; however, in some other embodiments, the particle(s) or particulate(s) can be liquid, gas, foams, emulsified droplets, etc. Moreover, in some embodiments, the particle(s) or particulate(s) of the current application are substantially stable and do not change shape or form over an extended period of time, temperature, or pressure; in some other embodiments, the particle(s) or particulate(s) of the current application are degradable, dissolvable, deformable, meltable, sublimeable, or otherwise capable of being changed in shape, state, or structure. All such variations should be considered within the scope of the current application.
Certain examples of treatment fluids, carrying media, and particles that can be used in the current application are illustrated in U.S. Pat. No. 7,784,541, US2011/0005760, US2010/0300688, U.S. Pat. No. 7,923,415, US2012/0000651, US2012/0000641, US2011/0155371, the entire contents of which are incorporated into the current application in the entireties.
In certain embodiments, the pump-ready treatment fluid is a fracturing fluid. In certain embodiments, the pump-ready fracturing fluid includes all ingredients, including proppant, for the fracturing treatment in a form that is directly deliverable to the suction side of a fracturing pump. The procedure may further include an operation to deliver the pump-ready fracturing fluid to a location operationally coupled to a wellsite, and an operation to provide the pump-ready fracturing fluid directly to a pump inlet. The procedure may further include an operation to pump the pump-ready fracturing fluid into a wellbore to initiate or propagate a fracture in the subterranean formation.
The term “proppant”, as used herein, refers to particulates that are used in well work-overs and treatments, such as hydraulic fracturing operations, to hold fractures open following the treatment. The proppant can be naturally occurring materials, such as sand grains. It may also include man-made or specially engineered proppants, such as resin-coated sand or high-strength ceramic materials like sintered bauxite. In some embodiments, the proppant of the current application has a density greater than 2.45 g/cc, such as sand, ceramic, sintered bauxite or resin coated proppant. In some embodiments, the proppant of the current application has a density less than or equal to 2.45 g/cc, such as less than about 1.60 g/cc, less than about 1.50 g/cc, less than about 1.40 g/cc, less than about 1.30 g/cc, less than about 1.20 g/cc, less than 1.10 g/cc, or less than 1.00 g/cc. In some embodiments, the proppant concentration in the treatment fluid is about 6 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 12 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 16 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 20 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 24 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 30 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 36 pound-per-gallon (PPA). In some embodiments, the proppant concentration in the treatment fluid is about 40 pound-per-gallon (PPA).
In some embodiments, the oilfield treatment fluid of the current application is substantially stable over a period of time so that it can be transported or otherwise delivered to a wellsite without significant change in one or more properties of the fluid, such as viscosity, density, etc. In certain embodiment, the treatment fluids of the current application are substantially stable for about 8 hours. In certain embodiments, the treatment fluid of the current application is substantially stable for at least 24 hours. In some further embodiments, the treatment fluid of the current application is substantially stable for at least 72 hours. As used herein, the term “substantially stable” in the context of oilfield operations means that the oilfield fluid is in a stable condition after preparation and can be readily applied to a subterranean formation to perform a desired oilfield operation. In some embodiments, the term “substantially stable” refers to a condition that the viscosity of the oilfield fluid does not change for more than 20% over a prolonged period of time.
Referencing now to
Example bulk material deliveries may include materials mined and processed on site (or nearby), trucked materials, or rail car materials. The loading and off-loading of mined or processed on site materials can be accomplished, in certain embodiments, using conventional techniques. Trucked and rail car delivered materials may be unloaded by using dumping or pneumatic conveying. Dumped materials may be collected and transferred into storage using screws, conveyor belts, air eductors, or valves into pressure pots for dense phase air transfer. In certain embodiments, equipment can be provided that either slides under the carrier or is built underground so that the carrier can move on top of the equipment. Pneumatic transfer is generally flexible in design and requires less site modification. Fine powders may be moved at relatively high transfer rates. The movement of sand is related to the pressure rating of the delivering vehicle and the size and length of the delivery hoses. In certain embodiments, a receiving vessel is equipped with a vacuum system to lower the vessel pressure, which may increase the differential pressure between the carrier and the receiving vessel, allowing higher flow rates without increasing the rating of the carrier.
The facility 202 can be positioned at a distance from a group of wellsites 108, sometimes more than 250 miles away, sometimes more than 100 miles away, and sometimes more than 50 miles away. Such a regional facility 202 may enhance logistical delivery of bulk material to a plurality of wellsites. In some other embodiments, the facility 202 may be positioned in a field among wellsites as indicated. Other example facilities 202 may be positioned near a single wellsite—for example on or near a remote location such as an offshore platform, on or near a pad for access to multiple wells from a single surface location, etc., which will be discussed in more details below. Additionally or alternatively, an example facility 202 can be positioned incrementally closer to one or more wellsites 208 than a base facility (or facilities) for treating equipment utilized to treat wells at the wellsite(s) 208. Yet another example facility 202 is positioned to reduce a total trip distance of equipment utilized to treat a number of wellsites relative to treating the wellsites from the base facility (facilities) of the various treating equipment. Yet another example facility 202 is positioned to reduce a total trip distance of equipment utilized to treat a number of wellsites, where the wellsites are distributed in more than one continuous field of wellsite locations.
Bulk material as utilized herein includes any material utilized in large quantities in a treatment fluid for a formation in a wellbore. The amount of material to be a large quantity is context specific. An example large quantity includes any amount of a specific material that is a sufficient amount of the specific material to produce an amount of a treatment fluid that exceeds the transport capacity of a transportation vehicle that delivers treatment fluid to a wellsite 208. In one example, if a sand truck to deliver proppant to a wellsite holds 38,000 pounds of proppant, an amount of proppant exceeding 38,000 pounds is a large quantity. Example an non-limiting bulk materials include: proppant, particles for a treatment fluid, particles for a treatment fluid having a specified size modality, gelling agents, breaking agents, surfactants, treatment fluid additives, base fluid for a treatment fluid (e.g. water, diesel fuel, crude oil, etc.), materials utilized to create a base fluid for a treatment fluid (e.g. KCl, NaCl, KBr, etc.), and acids of any type.
Referencing to
In certain embodiments, the bulk receiving facilities 302 receive and deliver chemical or fluid additives to various storage areas of the facility 202. The bulk receiving facilities 302 may be a single device, a number of devices, and/or a number of distributed devices around the facility 202.
The bulk receiving facility 302 may further include a mobile receiver that is capable of being positioned under a bulk material carrier (not shown) that is positioned on the loading access 204. For example, a truck or rail car carrying particles may stop on the loading access 204 in proximity to the bulk receiving facility 302, and the bulk receiving facility 302 includes a receiving arm or funnel that can be rolled out, slid out, swiveled out, or otherwise positioned under the bulk material carrier. Any type of bulk material and receiving device that is positionable under the bulk material carrier is contemplated herein.
In some embodiments, the bulk receiving facility 302 may further include a below grade receiver that allows a bulk material carrier to be positioned thereabove. In one example, the loading access 204 includes a road having a hatch, covered hole, grate, or any other device allowing bulk material released from the bulk material carrier to pass therethrough and be received by the bulk receiving facility 302. The loading access 204, in certain embodiments, includes a raised portion to facilitate the bulk receiving facility 302 having a receiver below the grade of the loading access 204.
In certain embodiments, the bulk receiving facility 302 may include a pneumatic delivery system for pneumatically receiving bulk material. The illustrated facility 202 includes a pump 320 and pneumatic lines 324 structured in a single system connecting the bulk receiving facility 302 and the bulk storage vessels 304, 306, 308, 310. The configuration of the pneumatic delivery system may be any system understood in the art, including individual units for each vessel, grouped or sub-grouped units, etc. An example bulk receiving facility 302 is structured to de-pressurize during delivery from the bulk material carrier, and/or the pneumatic delivery system depressurizes the corresponding bulk storage vessel 304, 306, 308, 310 during delivery from the bulk material carrier. The facility 202 may include pneumatic equipment (not shown) to pressurize the bulk material carrier.
In certain embodiments, the bulk receiving facility 302 may include a receiving area (not shown) to receive and store a bulk material carrier in the entirety. For example, an example loading access 204 may include a rail, and the bulk receiving facility 302 may include a siding that allows a bulk material carrier to be received in the entirety and be utilized directly as one or more of the bulk storage vessels 304, 306, 308, 310 at the facility 202. The bulk receiving facility 302 may be structured to receive any type of bulk material carrier in the entirety to be utilized as one or more of the bulk storage vessels 304, 306, 308, 310. In certain embodiments, a portion of the bulk material carrier may be received directly to act as one or more of the bulk storage vessels 304, 306, 308, 310.
In some embodiments, the facility 202 may include one or more batching vessels 312, 314, 316. The batching vessels 312, 314, 316, where present, provide for intermediate components of a final product fluid to be prepared in the proper proportions. One or more particle types from the bulk storage vessels 304, 306, 308, 310 are delivered in the selected proportions to the batching vessels 312, 314, 316. The bulk delivery may be pneumatic, for example through the pneumatic lines 324 and/or through a separate pneumatic system 324. In some embodiments of the bulk storage vessels 304, 306, 308, 310, these vessels may be provided with more than one discharge port. Such ports may be spaced such that the angle of repose of the bulk material in question allows it to be fully emptied from the bulk vessel. Further, more than one bulk inlet may be similarly provided to allow the bulk material to substantially fill the bulk storage vessel, unhindered by the angle of repose of the material. In further reference to bulk storage vessels with multiple discharge ports, control systems may be provided that select different discharge ports for various periods of time to allow the bulk vessel to be unloaded despite the angle of repose preventing the entire vessel from being unloaded from one discharge port. Such systems may further incorporate sensing means to detect that one discharge port has reached its limit of discharge due to the angle of repose of the bulk material and thus change to a different discharge port. In certain embodiments, the pneumatic system may include a heater 322 that heats the air in the pneumatic lines 324, especially with respect to bulk materials that are not sensitive to temperature variations, such as proppant. The heater 222 can be particularly beneficial for operations under freezing point, where the addition of bulk solids into carrying medium may cause the carrying medium to freeze.
In some embodiments, the delivery from the bulk storage vessels 304, 306, 308, 310 to the batching vessels 312, 314, 316 includes a mechanical delivery device. For example, the bulk storage vessels 304, 306, 308, 310 may include a portion having a reduced cross-sectional area (e.g. cone bottomed vessels). A screw feeder, airlock, rotary valve, tubular drag conveyor, or other mechanical device may also be used to transfer the bulk material from the bulk storage vessels 304, 306, 308, 310 to the batching vessels 312, 314, 316. Each of the batching vessels 312, 314, 316 can be coupleable to one or more of the bulk storage vessels 304, 306, 308, 310, for example by various valves (not shown). Conversely, each of the bulk storage vessels 304, 306, 308, 310 can be coupled to one or more of the batching vessels 312, 314, 316, for example by various valves (not shown).
Dependent upon the types of treatment fluids produced, one or more of the batching vessels 312, 314, 316 may be dedicated to or limited to delivery from one or more of the bulk storage vessels 304, 306, 308, 310. In one non-limiting example, a first batching vessel 312 receives particles from the first bulk storage vessel 304, a second batching vessel 314 receive particles from the second bulk storage vessel 306, and a third batching vessel 316 selectively receives particles from the third and/or fourth bulk storage vessels 308, 310. In
In some embodiments, the facility 202 may further include a fluid vessel 330 and fluid pumps 332. The fluid vessel 330 and fluid pumps 332 may contain any type of carrying medium, chemical(s), and/or additive(s) for a given treatment fluid.
In some embodiments, the facility 202 may further include a mixing device 326 that receives material from one or more of the batching vessels 312, 314, 316 and provides a mixed product fluid to a product storage vessel 328. The mixing device 326 may be any mixing device understood in the art that is compatible with the components of the treating fluid and that provides sufficient mixing. Example and non-limiting mixing devices 326 include a feed screw and a feed screw having mixing feature that provides additional fluid motion beyond axial fluid motion along the feed screw. An example feed screw with a mixing feature may include a tab, a slot, and/or a hole in one or more threads of the feed screw. Other example and non-limiting mixing devices 326 include a drum mixer, a ribbon blender, a planetary mixer, a pug mill, a blender, a controlled solids ratio blender (e.g. a POD blender), and/or a colloidal mixer. Another example mixing device 326 is a twin shaft compulsory mixer.
The mixer 326, as well as related controls and/or connected hardware to the mixer 326, provides in certain embodiments for receiving batched products according to a mixing schedule. The mixing schedule may include a schedule in time, spatial, and/or sequential mixing descriptions. For example, and without limitation, the product provided from each of the batching vessels 312, 314, 316 and/or fluid vessel 330 may be varied over time, the product provided from each of the batching vessels 312, 314, 316 and/or fluid vessel 330 may be provided to the mixing device 326 at distinct spatial positions (e.g. as shown in
In certain embodiments, the mixing device 326 and/or associated equipment conditions a powder (e.g. with an air pad, vibrator, heater, cooler, etc.) received at the mixing device 326. In certain embodiments, the mixing device 326 and/or associated equipment provides for a component dispersal. An example component dispersal includes pre-blending some or all of the component into one of the batching vessels 312, 314, 316 (e.g. to provide hydration time), pre-blending with an educator system, utilizing a paddle blender, injection through a pump or orifice, and/or injection into a centrifugal pump eye. In certain embodiments, the mixing device 326 and/or associated equipment provides for fluid conditioning, for example providing a desired fluid shear trajectory (high, low, and/or scheduled), de-lumping, straining, colloidal mixing, and/or shaking the fluid. In certain embodiments, the mixing device 326 and/or associated equipment provides for particle conditioning, for example providing sufficient fluid shear to break a larger particle size into a smaller desired particle size, and/or providing sufficient fluid shear to break or prevent clumping (e.g. between silica and calcium carbonate).
In certain embodiments, the sequencing of the addition of materials from the batching vessels 312, 314, 316, the spatial positions of the addition of materials, and/or the timing of the addition of materials, are selected to manage, minimize, or otherwise respond to compatibility issue and/or efficiency of mixing. For example, additions may be scheduled to minimize a contact time between incompatible components, and/or to add a material that minimizes incompatibility effects between two materials before one or both of the materials are added. In certain embodiments, the sequencing of the addition of materials from the batching vessels 312, 314, 316, the spatial positions of the addition of materials, and/or the timing of the addition of materials, are selected to account for physical deliverability characteristics of the components to be mixed. For example, a largest component may be added at a slow feed rate to the mixing device 326 at a position sweeping the entire device. A non-limiting example includes adding a largest component, adding all of a smallest component during the addition of the largest component, adding a medium component, and then finishing with the remainder of the largest component. A still further non-limiting example includes sequentially adding larger components and finishing with the addition of the largest component.
In certain embodiments, the mixing device 326 delivers the mixed product to a storage vessel 328. In certain embodiments, the mixing device 326 delivers the mixed product fluid directly to a transportation vehicle (not shown) which then transports the mixed product to a wellsite 208. In one example, the product storage vessel 328 is positioned to gravity feed a transportation vehicle. In some other examples, the product storage vessel 328 is positioned direction above the off-loading access 206, which in turn feeds a transportation vehicle. In certain embodiments, the product storage vessel 328 is pressurizable. In certain embodiments, the product storage vessel 328 includes a circulating pump, agitator, bubble column pump, and/or other agitating or stirring device.
Referencing to
The pilot plant 400 may further include a number of batching vessels 404. Each batching vessel 404 may be operationally coupled to a load cell (not shown), so that the batching vessel 404 may provide prescribed amounts of each particle from the bulk storage vessels 402. Examples of batch measurement of bulk materials include accumulative and/or decumulative weigh batching, which involves the use of a storage device (or batcher) mounted on load cells where the amount of powder can be determined by weighing the batcher. Accumulative methods measure the accumulation of powder delivered to the batcher. Once the appropriate amount is in the batcher, delivery is stopped and the powder may be supplied to the mixing system. Decumulative batching uses a large storage vessel where the movement of powder out of the vessel is measured. An example batch measurement system includes a batcher that is slightly larger than needed, where the batcher is filled by weight to slightly more than needed. Then, powder is extracted and a more precise measurement is made by decumulation.
Alternatively or additionally, batch measurement is achieved by direct control of the moving product. In certain embodiments, calibrated feeders (such as screw, belt, airlock, starwheel, or vibratory feeders) are used. In certain other embodiments, flow measuring devices (such as flow meters, mass flow meters, impact particle flow meters, etc.) are used.
A fluid vessel 406 may be provided along the batching vessels 404. The batching vessels 404 and the fluid vessel 406 can be loaded on a raised trailer, as illustrated in
The pilot plant 400 may further include a number of carrying medium vessels 414. The carrying medium vessels 414 may contain water, brine, as well as any other suitable carrying medium. Different carrying medium vessels 414 may contain the same type of liquid or distinct types of liquid. The pilot plant 400 further includes a number of additive vessels 410. The additive vessels 410 may contain chemicals, gelling agents, acids, inhibitors, breakers, or any other type of additive to be combined with the carrying medium. The skid including the additive vessels 410 may further include a batching tub 408. The final mixed product can be stored in finished product storage 412.
The units at the example pilot plant 400 are shown as skid loaded and transportable by standard highway vehicles. In certain embodiments, the entire bulk facility 202 can be made from skid loaded and/or transportable units. In certain embodiments, a portion or the whole bulk facility 202 are permanently constructed at a location.
The use of a centralized facility 202 and/or a pilot plant 400 provides for enhanced quality assurance and quality control of treatment fluids use at the wellsite. The facility 202 ensures that fluids are being generated in a uniform fashion and with uniform source materials (e.g. the same water source). Additionally, the mixing and material delivery equipment is not being moved or adjusted, and individual pieces of equipment are not being changed out—avoiding, for example, part to part variability that occurs when different styles of blenders are present on separate locations due to equipment availability. Further, the mixing and material delivery equipment at the facility 202 is not constrained to the same mobility requirements that apply to wellsite mixing and material delivery equipment, allowing for higher equipment quality and precision. In certain embodiments, a crew or crews working the facility 202 or pilot plant 400 may also have a more stable composition over time, for example relative to the composition of hydraulic fracturing crews, so that variability due to personnel is also minimized.
Still further, the centralized location of the fluid product provides one geographic location for testing one or more fluid features with precision. For example, a single unit of expensive testing equipment can thereby test all relevant treatment fluids for the region serviced by the facility 202 or pilot plant 400. Additionally, any complex or time consuming testing procedures can be performed at the facility 202 or pilot plant 400, avoiding travel costs and risks for testing personnel to be available at individual wellsite locations. In certain further embodiments, the automation and control elements available due to the presence of a controller 1002 (see the description referencing
An example centralized facility 202 and/or a pilot plant 400 provides an improved system-wide environmental impact by decoupling the wellsite location from the facility 202 location. For example, the facility 202 and/or pilot plant 400 can be provided in an area that is not environmentally sensitive (e.g. an industrially zoned area), avoiding areas that are environmentally sensitive. Example and non-limiting environmental sensitivities include zoning constraints, access constraints, noise considerations, the presence of endangered species, wetlands, and/or amicability considerations. Additionally or alternatively, the facility 202 and/or pilot plant 400 can be provided in an area that enables environmental management, such as carbon capture, fluid disposal, and/or fluid treatment that is not equivalently available at an individual wellsite.
In certain additional or alternative embodiments, the use of a centralized facility 202 and/or a pilot plant 400 provides for an improved environmental impact of the treatment fluid generation system. In one example, the facility 202 can be co-located with treatment facilities and/or disposal facilities. As an example, carbon capture facilities (e.g. a disposal well) may be present to store carbon dioxide emissions from various powered equipment at the facility 202. Any chemical or fluid effluents from the facility 202 can be treated into neutral products and/or stored in a disposal facility (e.g. a separate disposal well, the same disposal well, and/or a separate geological zone within the disposal well). Additionally, the facility 202 and related equipment is not constrained to be highly mobile, and accordingly enhanced environmental equipment (e.g. dust catchers, sound mufflers, etc.) may be present that would be inconvenient or expensive to include on wellsite mobile equipment. In other embodiments the recirculation may be accomplished using the pressure provided by pressurizing pump 512 and simply having hoses from the pump sumps leading back to the tanks 503 or the low pressure manifold 504.
Referencing to
The system 500 may further include one or more check valves 516 positioned between the low pressure manifold 504 and the vessels on the wellsite transportation vehicles 502. Additional or alternative, the system 505 may be a system that includes a means for adding a gel pill (e.g. a gel pill fluid source and pressurizing pump), a system without a low pressure manifold 504, a system with one or more fracturing pumps dedicated to particle free solution delivery (which may be coupled to a high pressure manifold), and/or a system with a fluid tank and fluid tank delivery pressure mechanism (e.g. sufficient hydraulic pressure from the orientation and/or raising of the fluid tank, pressurizing pump for the fluid tank, etc.).
The wellbore 522 may be cased and/or cemented into the ground. Alternatively or additionally, the wellbore 522 may be open or otherwise unfinished or uncompleted. The wellbore 522 may be a vertical well or a horizontal well, as shown in
An example procedure that can be implemented by system 500 may include performing the fracture treatment where no blender is present at the location. An example procedure may further include an operation to recirculate a sump of the positive displacement pump during the pumping. The operation to recirculate the sump and/or suction side of the positive displacement pump includes operating a recirculating pump fluidly coupled to the sump/suction side of the fracturing pump. In certain embodiments, a dedicated pump (not shown) pumps into or pulls from the sump to clean out and/or prevent sanding off in the sump.
Referencing
In certain further embodiments, each point of interest 804, 804′ is associated with one or more facilities 802, 802′. In certain embodiments, a facility 802, 802′ is a fracture fluid batching facility, for example as illustrated in
In certain embodiments, a method is disclosed for preparing a pump-ready fluid. An example method includes providing a carrier fluid fraction, providing an immiscible substance fraction including a plurality of particles such that a packed volume fraction (PVF) of the particles exceeds 64%, and mixing the carrier fluid fraction and the immiscible substance fraction into a treatment slurry. In certain embodiments, the immiscible substance fraction exceeds 59% by volume of the treatment slurry. The method includes providing the treatment slurry to a storage vessel. The storage vessel may be a vessel at a facility 202 or pilot plant 400. In certain embodiments, the method includes positioning the storage vessel at a wellsite. In certain embodiments, the storage vessel is not fluidly coupled (in fluid communication) to a wellbore at the wellsite. The storage vessel may be fluidly coupleable to a wellbore at the wellsite, and/or the storage vessel may be a vessel that is transportable to the wellsite, and/or a storage vessel configured to couple to and transfer the pump-ready fluid to a transporting device.
In certain embodiments, the method includes positioning the storage vessel at a wellsite, and/or positioning the storage vessel vertically, for example where the storage vessel is a vertical silo. An example vertical silo includes a frame attached to the silo that deploys the silo from the transport vehicle, and reloads the silo to the transport vehicle after the treatment. Another example vertical silo is a modular and stackable silo, which may include an external frame for the silo. Another example vertical silo is raiseable directly on the transport vehicle, for example as shown in
In certain embodiments, the method includes fluidly coupling the storage vessel to a pump intake, and treating a wellbore with the treatment slurry. In certain embodiments, the method further includes providing all of a proppant amount for the treating of the wellbore within the treatment slurry. Stated differently, in certain embodiments no proppant is added to the treatment slurry after the pump-ready treatment fluid is prepared. Accordingly, the treating equipment omits, in certain embodiments, a proppant delivery vehicle (e.g. sand truck and/or sand Chief) and/or a blender (e.g. a POD blender).
In certain further embodiments, the method includes performing the operations of: providing the carrier fluid fraction, providing the immiscible substance fraction, and mixing the carrier fluid fraction, at a facility remote from a wellsite. The wellsite is any one of the wellsites intended to be served by the facility, and/or intended as the treatment target for the treatment slurry. An example facility includes a powered device to perform at least one of the providing and mixing operations, and an example method further includes capturing an emission (such as carbon dioxide) of the powered device. An example capturing operation includes capturing the emission and may further include disposal of the emission. An example of disposal include injecting the carbon dioxide into a disposal well operationally coupled to the facility, although any emission capture operation known in the art is contemplated herein. In certain embodiments, the method further includes capturing and disposing of a treatment fluid byproduct at the facility remote from the wellsite. The disposing of the treatment fluid byproduct includes any treating operation to render the treatment fluid byproduct harmless, and/or direct disposal of the treatment fluid byproduct, for example into a disposal well. The disposal well for captured carbon the disposal well for the treatment fluid byproduct may be the same or distinct wells, and the geological formations for disposal within the disposal well may be the same or distinct formations.
In certain further embodiments, an example method includes selecting a location for the facility remote from the wellsite by selecting a location having an enhanced location profile relative to a location profile of the wellsite, where the wellsite is an intended treatment target for the treatment slurry. The determination of an enhanced location profile may be made with respect to any special consideration. Example and non-limiting location considerations include environmental, zoning, regulatory, situational, and/or amicability considerations. Examples include locating the facility in an industrial zoned area, locating the facility away from environmentally sensitive areas, locating the facility where adequate disposal is present or can be made available, locating the facility in an area supported by nearby property owners or local governments, etc.
Referring to
The control unit 1000 may include a controller 1002 structured to functionally execute operations to communicate with and/or control the facility 202, 802, 902. In certain embodiments, the distance of communication exceeds 250 miles, although any other distance can be contemplated. In certain embodiments, the controller 1002 forms a portion of a processing subsystem including one or more computing devices having memory, processing, and communication hardware. The controller 1002 may be a single device or a distributed device, and the functions of the controller may be performed by hardware or software. The controller 1002 may be in communication with any sensors, actuators, i/o devices, and/or other devices that allow the controller to perform any described operations.
In certain embodiments, the controller 1002 may include one or more modules structured to functionally execute the operations of the controller. In certain embodiments, the controller includes facility feedback module 1004, a treatment design module 1006, and a facility control module 1008. An example facility feedback module 1004 may interpret facility conditions, including temperatures, pressures, actuator positions and/or fault conditions, fluid conditions such as fluid density, viscosity, particle volume, etc., and supply indications for various materials at the facility. An example treatment design module 1006 may interpret a treatment schedule, a fluid recipe, and/or fluid preparation conditions. An example facility control module 1008 may provide facility commands in response to the facility conditions and the treatment schedule, wherein one or more actuators or display units at the facility are responsive to the facility commands. In certain embodiments, the controller 1002 further includes a facility maintenance module 1010. An example facility maintenance module 1010 may provide a facility supply communication and/or a facility maintenance communication in response to the facility conditions and/or the treatment schedule.
The description herein including modules emphasizes the structural independence of the aspects of the controller, and illustrates one grouping of operations and responsibilities of the controller. Other groupings that execute similar overall operations are understood within the scope of the present application. Modules may be implemented in hardware and/or software on computer readable medium, and modules may be distributed across various hardware or software components. Moreover, certain operations described herein include operations to interpret one or more parameters. Interpreting, as utilized herein, includes receiving values by any method known in the art, including at least receiving values from a datalink or network communication, receiving an electronic signal (e.g. a voltage, frequency, current, or PWM signal) indicative of the value, receiving a software parameter indicative of the value, reading the value from a memory location on a computer readable medium, receiving the value as a run-time parameter by any means known in the art including operator entry, and/or by receiving a value by which the interpreted parameter can be calculated, and/or by referencing a default value that is interpreted to be the parameter value.
Referencing back to
The example controller 1002 further includes a treatment design module 1006. The example treatment design module 1006 interprets a treatment schedule 1014. An example treatment schedule 1014 includes information relevant to a production fluid to be produced at the facility. An example treatment schedule 1014 may include a fluid type, fluid amount, fluid ingredients, and fluid characteristics, such as density, viscosity, particle volume, etc. The fluid type may be a quantitative or qualitative description. The controller 1002 in certain embodiments accesses stored information to determine the formulation of a qualitatively described fluid. In certain embodiments, the treatment schedule 1014 includes a number of fluids, a trajectory of fluids (e.g. a fluid density or proppant density ramp), and/or a sequence of fluids.
In certain embodiments, the treatment schedule 1014 further includes a fluid recipe 1016. An example and non-limiting fluid recipe 1016 may include a list of ingredients to be mixed to provide the pump-ready treatment fluid, the amount of each ingredient, a mixing schedule (e.g. a first particle type to be added first, and a second particle type to be added second, etc.), a gelling schedule, a breaker schedule, a desired fluid density and viscosity, etc. Any fluid formulation information that is actionable by the facility is contemplated herein as a potential aspect of the treatment schedule 1014 and/or fluid recipe 1016. Additionally or alternatively, the treatment schedule 1014 may further include fluid preparation conditions 1018. Example and non-limiting fluid preparation conditions 1018 include fluid shear rates, hydration times, hydration temperatures, etc. In certain embodiments, information may overlap between the fluid recipe 1016 and the fluid preparation conditions 1018.
The example controller 1002 may further include the facility control module 1008. The facility control module 1008 provides facility commands 1020 in response to the facility conditions 1012 and the treatment schedule 1014, the fluid recipe 1016, and/or the fluid preparation conditions 1018. In certain embodiments, the facility commands 1020 are direct commands to actuators of the facility. Additionally or alternatively, the facility commands 1020 provide instructions that indirectly cause operations at the facility—for example communicated information to a display device (computer monitor, printout, etc.). Example facility commands 1020 provide the actions that create the fluid according to the treatment schedule 1014, adjust facility operations according to the measured fluid conditions such as fluid density, viscosity, particle volume, etc., and/or provide the actions that create a fluid acceptably close to the fluid according to the treatment schedule 1014, for example substituting products according to availability, etc.
The example controller 1002 may further include a facility maintenance module 1010 that provides a facility supply communication 1022 and/or a facility maintenance communication 1024 in response to the facility conditions 1012 and/or the treatment schedule 1014 including the fluid recipe 1016 and/or the fluid preparation conditions 1018. An example includes any actuator or sensor fault or diagnostic indicator at the facility may be provided by the facility maintenance module 1010, for example as a facility maintenance communication 1024 that is communicated to notify a maintenance operator of the condition. In certain embodiments, a facility condition 1012 indicating that a fluid constituent is not available in sufficient quantities or is running low may be communicated as a facility supply communication 1022. The described usages of the facility supply communication 1022 and the facility maintenance communication 1024 are examples and non-limiting. Without limitation, any indication that an aspect of the facility is non-functional, degrading, running low, below a predetermined threshold value, and/or of an unknown status may be communicated by the facility maintenance module 1010 and/or controller 1002.
While the disclosure has provided specific and detailed descriptions to various embodiments, the same is to be considered as illustrative and not restrictive in character. Only certain example embodiments have been shown and described. Those skilled in the art will appreciate that many modifications are possible in the example embodiments without materially departing from the disclosure. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the following claims.
In reading the claims, it is intended that when words such as “a,” “an,” “at least one,” or “at least one portion” are used there is no intention to limit the claim to only one item unless specifically stated to the contrary in the claim. When the language “at least a portion” and/or “a portion” is used the item can include a portion and/or the entire item unless specifically stated to the contrary. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. For example, although a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. §112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function.
