Hydraulically operated double-acting positive displacement pump system for generating fluid from boreholes

Abstract

A submersible downhole pumping system is provided. The pumping system is designed such that all fluid and electrical signal conduits are internalized within the pumping assembly. This design provides the pumping assembly with a substantially consistent and slim profile. The pumping assembly includes a housing that houses a power assembly, a powered actuator assembly operatively linked to a production fluid assembly, and a central bore extending through the pumping assembly to provide fluid communication between the power assembly and a first end of the pumping assembly. The pumping system further includes a flow distributor / connector at the first end or pump head that provides fluid communication between the pump head and a conduction system extending from the surface to the pumping system. The communicating fluids include high-pressure power hydraulic fluid, low-pressure discharge hydraulic fluid, and pressurized produced wellbore fluid.

Description

Technical Field

[0001]

[0001] Technical Field

[0002] The present disclosure is directed to devices and systems for supplying fluid from the surface to a downhole pump in a wellbore and for pumping fluid from the pump back to the surface. Specifically, embodiments of the present disclosure include a pumping system having a slim profile sized for use in wellbores of various dimensions.

Background Art

[0002]

[0003] Background

[0004] It is known to use reciprocating linear pumps installed in a row at the lower end of a well, by installing a conduit between the pump and the surface collecting equipment and powering the reciprocating motion of a pump that typically has pistons deployed in a cylinder with associated flow valve control devices such as one-way valves to control the fluid flow within the pump subassembly. This power is supplied to the reciprocating motion of the pump. The linear pump may be a conduit or stages of lift pistons and packers, each with a suitable one-way valve at each stage. While these systems have been used for a long time, proven effective over time, and offer high reliability, they cannot be actually deployed in deflected wells (commonly referred to as "horizontal wells") because they impact the inner wall of the well, thereby preventing the series of rigid, interconnected rods from performing linear motion at corners or bending in deflected wells without causing damage and wear to both the casing and rod system. In addition, pump-jack style lift systems provide a highly uneven pressure profile and smaller, more uneven flow rates for the generated fluid, resulting in smaller pumping volumes and less inefficiency. These pumps are very common and form part of the common sense in the field of this invention.

[0003]

[0005] Known solutions for supplying the generated fluid from a horizontal well utilize a relatively flexible fluid conduit fluid-connected to an electrically submersible pump (ESP). Known ESPs may have various externally connected fluid conduits and conductors to supply fluid and electrical command signals to the locations where they must be supplied for proper functioning. [Overview of the Initiative] [Problems that the invention aims to solve]

[0004]

[0006] overview

[0007] Without being constrained by any particular theory, embodiments of the present disclosure relate to a pumping assembly that fluidly communicates all related fluid conduits to associated subassemblies along the longitudinal axis of the assembly. The fluid conduits are positioned inside the outer surface of the pumping assembly. Furthermore, embodiments of the present disclosure provide an internalized conductor that enters one end of the pumping assembly and extends substantially along the longitudinal axis of the pumping assembly to supply (and receive) electrical signals to a power assembly at the downhole end of the pumping assembly. The in-line and internal fluid conduits and internal conductors allow the outer surface of the pumping assembly to have a substantially constant outer diameter along its length and a substantially smooth external profile. Without being constrained by any particular theory, the substantially constant outer diameter and smooth external profile may allow the pumping assembly to have a smaller cross-sectional area so that it can be used in smaller wells where known pumps cannot fit. [Means for solving the problem]

[0005]

[0008] Some embodiments of the present disclosure relate to downhole pumping assemblies. Pump assemblies include a first end and a second end defining an outer surface between them, the outer surface having a substantially constant outer diameter. The pumping assembly further includes a power assembly adjacent to the second end and configured to guide a power fluid, and a generating fluid assembly adjacent to the first end and configured to receive well fluid and to guide the received well fluid toward the first end, comprising a generating piston. The pumping assembly also includes a power-supplying actuating assembly positioned adjacent to the power assembly and in fluid communication with the power assembly, wherein the power-supplying actuating assembly is operably coupled to the generating fluid assembly, and the power-supplying actuating assembly is configured to move the generating piston via the operable coupling to receive power fluid and to guide the received well fluid toward the first end, and a central conduit extending from the first end to the power assembly to conduct power fluid between them.

[0006]

[0009] Some embodiments of this disclosure relate to a connector, also referred to herein as a flow distributor. The connector has a first end connectable to a fluid transport system and a second end connectable to a pumping assembly. The connector also includes an internal fluid channel in fluid communication with a first fluid conduit, a second fluid conduit, and a third fluid conduit. The internal fluid channel conducts the fluid contents of the first fluid conduit such that it detaches from the second end at a substantially central position in relation to the body of the connector. The connector is also configured to provide one or more internal conductive channels to allow one or more conductors to extend.

[0007]

[0010] Some embodiments of the present disclosure relate to a system comprising an underground fluid conduction system for conducting a power fluid to a connector and a discharge fluid from the connector to the ground surface. The system further comprises a connector through which the power fluid, discharge fluid, and generated fluid are conducted. The system further comprises a pumping assembly that is fluid-connectable to the connector at a first end. The pumping assembly includes a power assembly at the end opposite to the first end and a power-supplying actuator assembly. The power-supplying actuator assembly is in fluid communication with the power assembly in order to move a power-supplying piston of the power-supplying actuator assembly. The pumping assembly also includes a generated fluid piston operably linked to the power-supplying piston. The pumping assembly further includes a central conduit extending from the first end to the power assembly, the central bore configured to receive the power fluid from the fluid conduction system in order to conduct the power fluid to the power assembly.

[0008]

[0011] In some embodiments of the present disclosure, the fluid conduction system is configured to house one or more conductors that are extendable from the ground surface to the connector. In some embodiments of the system, the fluid conduction system includes a conduit that conducts the generated fluid received from the connector to an upper wellhead. The fluid conduction system also has a pair of two conduits, one positioned inside the other, and the pair of conduits is configured to enable fluid connection to a central conduit of the pumping assembly. The pair of conduits is further configured to supply power fluid to the central conduit and to receive discharge fluid from the central conduit. In these embodiments, the connector defines an internal fluid flow channel system configured to guide the appropriate fluid from the pumping assembly to the appropriate fluid conduit of the fluid conduction system.

[0009]

[0012] In some embodiments of the present disclosure, the fluid transport system has three fluid conduits, the first conduit being positioned within the second conduit, and the second conduit being positioned within the third conduit. One of the three conduits is configured to supply power fluid from the ground to the connector. Another of the three conduits is configured to supply discharge fluid from the connector to the ground above. Another of the three conduits is configured to supply generated fluid from the connector to the ground above. In these embodiments, the connector defines an internal fluid flow channel system configured to guide the appropriate fluid from the pumping assembly to the appropriate fluid conduit of the fluid transport system.

[0010]

[0013] In some embodiments of the present disclosure, the fluid transport system has two sets of fluid conduits, each set having a first conduit positioned within a second conduit. The outer conduit of each set can supply generated fluid from the connector to the ground. The inner conduit of one set can supply power fluid from the ground to the connector, and the inner conduit of the other set can supply discharge fluid from the connector to the ground. In these embodiments, the connector defines an inner fluid flow channel system configured to guide the appropriate fluid from a pumping assembly to the appropriate fluid conduit of the fluid transport system.

[0011]

[0014] In some embodiments of the present disclosure, the fluid transport system has two fluid conduits, one positioned inside the other. The inner fluid conduit is configured to supply power fluid from the ground to the connector, and the outer conduit is configured to supply discharge fluid from the connector to the ground. In these embodiments, the connector defines an inner fluid flow channel system configured to guide the appropriate fluid from the pumping assembly to the appropriate fluid conduit of the fluid transport system. In these embodiments, the connector is configured to seal-engage with the inner surface of the well so that the generated fluid can be transported by the well to the ground.

[0012]

[0015] In some embodiments of the present disclosure, the fluid conduction system has three separate fluid conduits, one for conducting power fluid to a connector, one for conducting discharge fluid from the connector to the ground, and the others for conducting generated fluid from the connector to the ground.

[0013]

[0016] Brief explanation of the drawing

[0017] The features of this disclosure will become clearer in the following detailed description, which will refer to the attached drawings. [Brief explanation of the drawing]

[0014] [Figure 1]

[0018] This is a schematic diagram illustrating a system according to an embodiment of the present disclosure, configured to supply fluid from the ground surface into a well and to a downhole pump, and to supply fluid from the pump back to the ground surface. [Figure 2A]

[0019] Figure 1 is a schematic diagram illustrating the operation of the pumping assembly of the system, and Figure 2A shows the piston moving in the first direction. [Figure 2B]

[0019] Figure 1 is a schematic diagram illustrating the operation of the pumping assembly of the system, and Figure 2B shows the same piston moving in the opposite direction in a rotation diagram different from Figure 2A. [Figure 3A]

[0020] This is a schematic diagram of the valve assembly, and Figure 3A shows the operating position of the valve assembly due to the operation depicted in Figure 2A. [Figure 3B]

[0020] This is a schematic diagram of the valve assembly, and Figure 3B shows the operating position of the valve assembly due to the operation shown in Figure 2B. [Figure 4]

[0021] This is a schematic diagram that shows the system in Figure 1 in more detail. [Figure 5]

[0022] Figure 4 shows the transformation of the system. [Figure 6A]

[0023] Shows the components of the system depicted in FIG. 4 in more detail. FIG. 6A shows the fluid conduction system and surface equipment. [Figure 6B]

[0023] Shows the components of the system depicted in FIG. 4 in more detail. FIG. 6B shows the connector. [Figure 7]

[0024] Shows a variation of the system depicted in FIG. 4. [Figure 8A]

[0025] Shows the components of the system depicted in FIG. 7 in more detail. FIG. 8A shows the fluid conduction system and surface equipment. [Figure 8B]

[0025] Shows the components of the system depicted in FIG. 7 in more detail. FIG. 8B shows the connector. [Figure 9]

[0026] Shows a variation of the system depicted in FIG. 4. [Figure 10A]

[0027] Shows the components of the system depicted in FIG. 9 in more detail. FIG. 10A shows the fluid conduction system and surface equipment. [Figure 10B]

[0027] Shows the components of the system depicted in FIG. 9 in more detail. FIG. 10B shows the connector. [Figure 11]

[0028] Shows a variation of the system depicted in FIG. 4. [Figure 12A]

[0029] Shows the components of the system depicted in FIG. 11 in more detail. FIG. 12A shows the fluid conduction system and surface equipment. [Figure 12B]

[0029] Shows the components of the system depicted in FIG. 11 in more detail. FIG. 12B shows the connector. [Figure 13]

[0030] Shows a variation of the system depicted in FIG. 4. [Figure 14A]

[0031] Shows the components of the system depicted in FIG. 13 in more detail. FIG. 14A shows the fluid conduction system and surface equipment. [Figure 14B]

[0031] Figure 13 shows the components of the system in more detail, and Figure 14B shows the connectors. [Modes for carrying out the invention]

[0015]

[0032] Detailed explanation

[0033] Unless otherwise defined, all technical and scientific terms used herein have the meanings generally understood by those skilled in the art in relation to this disclosure. Any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this disclosure; preferred methods and materials are described below. Any references made herein are entirely incorporated herein by reference.

[0016]

[0034] Embodiments of the present disclosure relate to a submersible pumping system for a downhole that supplies a generated fluid within a well from an underground area to surface equipment. Embodiments of the present disclosure relate to a pumping system comprising a pumping assembly, which includes an outer housing and is designed to house all of the functional and conduction components of the pumping assembly. Without being bound by any particular theory, the housing of the functional and conduction components of the pumping assembly allows the outer surface of the outer housing to have a smaller outer diameter than other downhole pumping assemblies. The housing of the functional and conduction components of the pumping assembly may also allow the outer housing to have a substantially constant outer profile. A small outer diameter and / or substantially constant outer profile may allow the pumping system to be used in wells with an inner diameter of about 5.5 inches or more (1 inch is about 2.54 cm).

[0017]

[0035] Figure 1 is a non-limiting schematic diagram of a pumping system 600 according to an embodiment of the present disclosure. The system 600 includes a ground system 602 of the equipment and an underground system 604 of the equipment. The ground system 602 comprises a hydraulic station 300 and a controller system 400. The hydraulic system 300 includes a hydraulic tank 85 that contains a predetermined volume of hydraulic fluid 80. A primary positive displacement hydraulic pump 40 is in fluid communication with the tank 85 to draw and pressurize the hydraulic fluid 80 into the power fluid 55, and the power fluid 55 can flow through a first flow control meter 50 and / or a second flow control meter 35 before entering the power conduit 56. The power conduit 56 contains the pressurized power fluid 55 capable of supplying power to one or more components of the underground system 604. The hydraulic station 300 can receive a return conduit 66 that contains low-pressure discharge fluid 65 returning from the underground system 604. The return conduit 66 is in fluid communication with the tank 85, and the discharged fluid can pass through the liquid fluid cooler 70 and / or filter 75 before entering the tank 85.

[0018]

[0036] The controller system 400 can be operably connected to one or more components of the hydraulic station 300. For example, the controller 400 may include a computerized programmable logic controller (PLC) 402. The PLC 402 may include a display and flow meter module 35A for flow control of the power fluid 55 by controlling a flow control meter 35. The PLC 402 may also include a pressure control system (P / T) 40A configured to control the pressure of the power fluid 55 by controlling the activity of a primary positive displacement hydraulic pump 40. The PLC 402 may also include a temperature control system (T / T) 80A for controlling the temperature of the fluid 80 in the tank 85 via one or more temperature sensors and heating elements (not shown). The PLC 402 may further include a variable frequency drive (VFD) 36A for controlling the activity of the primary positive displacement hydraulic pump 40, and a further VFD 70A for controlling a cooling device 70.

[0019]

[0037] The PLC402 may also include one or more solenoid controllers 31A and 32B and one or more limit switch controllers 33A and 34A. Commands in the form of electrical signals from controllers 31A, 32A, 33A, and 34A can be transmitted to the underground equipment via the conductive system 608. As will be understood by those skilled in the art, the conductive system 608 can be protected from the harsh environment present in the well so as to provide efficient communication of commands from controllers 31A, 32A, 33A, and 34A to the underground equipment.

[0020]

[0038] The PLC402 can be configured to supply power fluid 55 via conduit 56 at a desired pressure and temperature and to regulate the motion of one or more components of underground equipment 604 via controllers 31A, 32B, 33A, 34A. As will be understood by those skilled in the art, the PLC402 can be pre-programmed to perform this regulation and / or can respond to commands entered by the user.

[0021]

[0039] The above-ground system 602 may further include a wellhead system 200, which includes conduits 55 and 65, conductors of the conductive system 608, and a wellhead 20 configured to receive a generated fluid outlet 25. In addition to other functions, the wellhead system 200 is further configured to provide pressure control of the fluid in the well 15 of the underground system 604. The well 15 may be reinforced, coated, solidified or not, and the well 15 is configured to receive a generated fluid from a nearby underground reservoir, such as a multiphase flow of solid, gas, and liquid. The reservoir may be stimulated by hydraulic fracturing, by thermal stimulation (such as cyclic steam cycling, steam-assisted gravity draining, or heated solvent stimulation), by chemical stimulation (such as solvent stimulation), and by similar stimulation.

[0022]

[0040] The underground system 604 may include a pump assembly 500 and a fluid conduction system 606 extending from the pump assembly 500 to the wellhead 20. The fluid conduction system 606 provides one or more conduits for conducting power fluid 55 from conduit 56 to the pump assembly 500 and for conducting discharge fluid 65 from the pump assembly 500 to conduit 66. In some embodiments of the disclosure, the fluid conduction system 606 may also provide an optional generating conduit 10 for conducting generated fluid to a generated fluid outlet 25. In some embodiments of the disclosure, the fluid conduction system 606 may also provide a conduit for a conduction system 608 extending from the wellhead 20 to the pumping assembly 500.

[0023]

[0041] The pumping assembly 500 is configured to be positioned within an oil and / or gas well and to receive the generated fluid. The pumping assembly 500 is configured to pressurize the received generated fluid (shown as unpressurized received generated fluid 23 and pressurized received generated fluid 25 in Figure 2) and to supply it to the generated fluid outlet 25 of the wellhead system 200. The pumping assembly 500 comprises a first end 500A and a second end 500B that define the longitudinal axis of the pumping assembly 500 (represented by line α in Figure 1). As will be understood by those skilled in the art, the first end 500A is closer to the wellhead 20 and may therefore be referred to as the uphole end. The second end 500B is further away from the wellhead 20 and may therefore be referred to as the downhole end. The term “uphole” may be used herein to mean the end of a component or the directional orientation within the well toward the wellhead 20. The term "downhole" may be used herein to mean a component or orientation within the well that is away from the wellhead 20.

[0024]

[0042] In some embodiments of this disclosure, the pumping assembly 500 comprises three main components: a power assembly 502, a power-supplying actuator assembly 504, and a generating fluid assembly 506. The pumping assembly 500 further includes a central conduit 508 extending from a first end 500A through the generating fluid assembly 506 and the power-supplying actuator assembly 504 to the power assembly 502. The central conduit 508 may be centrally located within the cross-sectional area of ​​the pumping assembly 500, or, in some embodiments, may be located at a non-central location. The central conduit 508 is configured to provide fluid communication between the downhole end (also referred to as the flow distributor) of the fluid delivery system 606 via a connector 170 and the power assembly 502.

[0025]

[0043] The power assembly 502 is configured to receive power fluid 55 from the conduit 56 via the central conduit 508. The power assembly is further configured to guide the power fluid 55 to the power actuator assembly 504 in order to move the power supply piston 112 inside it. The power supply piston 112 is operably coupled to the generating piston 135 by a linking member 520 such that when the power supply piston 112 moves in a first direction, the generating piston 135 moves in the same direction and by the same stroke distance (see Figure 2). Also, when the power supply piston 112 moves in a second opposite direction, the generating piston 135 moves in the second direction and by the same stroke distance as the power supply piston 112 moved.

[0026]

[0044] Furthermore, as will be described later, the pumping assembly 500 may also include a connector 170 connectable to the first end 500A of the pumping assembly 500 to provide fluid communication between the downhole end of the fluid conduction system 606 and the central conduit 508. The connector 170 may also be referred to as a flow distributor. In some embodiments of this disclosure, the connector 170 may also provide a channel for conductors of the conduction system 608 to enter the inside of the pumping assembly 500. In these embodiments, all conduits supplying all fluids / fluids to and from the pumping assembly 500 and all conductors supplying electrical signals to and from the pumping assembly 500, and optionally from there, are located inside the outer surface 500A of the pumping assembly 500. In some embodiments of the present disclosure, the main components of the pumping assembly 500, namely the power assembly 502, the power-supplying actuator assembly 504, and the generating fluid assembly 506, are all housed within an outer housing of the pumping assembly 500, the outer housing defining an outer surface 500C. In other embodiments, each of the power assembly 502, the power-supplying actuator assembly 504, and the generating fluid assembly 506 defines its own individual outer surface such that when all of these assemblies are assembled together within the pumping assembly 500, they define an outer surface 500C.

[0027]

[0045] Without being constrained by any particular theory, the internalization of all fluid conduits, electrical conduits, and all other components of the pumping assembly 500 within the outer surface 500C provides a substantially constant external profile for the pumping assembly 500. Furthermore, this internalized design allows the pumping assembly 500 to be constructed to have an external diameter that may be smaller than that of other known submersible downhole pumping systems. In some embodiments of the present disclosure, the external diameter of the pumping assembly 500 may be substantially constant along its length from the first end 500A to the second end 500B. In some embodiments of the present disclosure, the external diameter of the pumping assembly 500 may be configured such that the outer surface 500C has substantially no protrusions, so that the profile of the pumping assembly 500 may be referred to as a “smooth profile”.

[0028]

[0046] Figure 2 provides a non-limiting schematic diagram of the function and fluid flow within the pumping assembly 500 during its operation.

[0029]

[0047] The power assembly 502 has an outer wall 63, which may or may not form part of the outer housing of the pumping assembly 500, but the outer wall 63 contributes to defining at least a portion of the outer surface 500C. The outer wall 63 defines an internal plenum 81 which functions as a reservoir for holding lower-pressure discharge fluid 65. The internal plenum 81 also houses a switchable valve 60.

[0030]

[0048] Hydraulic power is supplied to the pumping assembly 500 by the supply of pressurized power fluid 55 from the ground to the central conduit 508 via the conduit 56 and the fluid conduction system 606. The power fluid 55 flows through the length of the pumping assembly 500 to the power assembly 502 and is led to the first surface 112A or the second surface 112B of the power supply piston 112. The lower-pressure discharge fluid 65 flows through the fluid conduction system 606 to the discharge conduit 66 and back to the internal plenum 81 from where it entered the central conduit 508 in order to return to the hydraulic station 300. In short, the power fluid 55 flows in a closed-loop system with the ground through the conduit 56 to the pumping assembly 500, then through the fluid conduction system 606, and then through the central conduit 508 to the valve 60. The movement of the valve 60 during its operating position guides the power fluid 55 to the first surface 112A or the second surface 112B of the power supply piston 112. The power fluid 65 is guided from the opposite surface of the power supply piston 112 on which the power fluid 55 acts to flow through the valve 60 for return via the central conduit 508, as described above. Being a closed system, the power fluid 55 may be at a higher pressure inside the power supply actuator assembly 504 than the ambient well pressure, which can help lubricate and establish a pressure isolation effect to prevent well fluid and contaminants from reaching the moving parts of the power supply actuator assembly 504. In some embodiments of the present disclosure, the pressure of the power fluid 55 inside the power supply actuator assembly 504 may be at least twice the ambient well pressure.

[0031]

[0049] As shown in Figure 2A, the central conduit 508 includes an inner conduit 510 that is coaxial with the central conduit 508 and extends for the same length. The inner conduit 510 is configured to receive power fluid 55 from the fluid conduction system 606 and to conduct the power fluid 55 to the valve 60. Between the wall of the central conduit 508 and the inner conduit 510 is an annular space configured to receive power fluid 65 from the inner plenum 81 of the power assembly 502 and to conduct the power fluid 65 to the conduit 66 via the fluid conduction system 606. As will be understood by those skilled in the art, the power fluid 55 is at a higher pressure than the power fluid 65, and therefore, from a material and safety standpoint, it may be desirable to use the inner conduit 510 to conduct the power fluid. However, according to this disclosure, it is assumed that the inner conduit 501 may be used to conduct the power fluid 65, and the annular space may be used to conduct the power fluid.

[0032]

[0050] The power-supplying actuator assembly 504 may be housed within the outer housing of the pumping assembly 500, or it may include an outer wall 526. In the latter case, the outer wall 526 contributes to defining the outer surface 500C of the pumping assembly 500. An annular fluid chamber is defined between the outer wall 526 (or, optionally, the outer housing) and the cylinder 528, which consequently houses the power-supplying piston 112. The cylinder 528 has a first end 528A and a second end 528A, the second end 528B being close to and in fluid communication with the power assembly 502 (see Figure 2A). The power-supplying piston is configured to slide along the inner surface of the cylinder 528 toward one end of the cylinder 528 in a first direction and toward the other end of the cylinder 528 in a second opposite direction. To ensure that fluid communication does not occur across the power supply piston, and optionally to facilitate the sliding motion of the power supply piston 112, a suitable seal 113 can be positioned between the outer edge of the power supply piston 112 and the inner surface of the cylinder 528.

[0033]

[0051] Valve 60 may be an electromechanical switching valve configured to receive power fluid 55 from a central conduit 508 via one or more conduits 56A to guide the flow of power fluid 55 to the first face 112A or second face 112B of the power-supplying piston 112 so that the piston 112 moves (strokes) in a first direction or a second opposite direction, or so that the flow of power fluid 55 bypasses the power-supplying actuator assembly 504 and flows only through the valve, completing the return circuit to the ground. The three valve positions may be referred to as “direct flow,” “crossover flow,” and “bypass” or “idle.” The “bypass” valve position isolates the actuator from the hydraulic fluid flow and causes the piston 112 to brake or lock at its current position, which is useful in avoiding problems when a trip of the downhole component occurs into or out of the well where the pressure changes as the pumping assembly 500 moves in an uphole or downhole within the well.

[0034]

[0052] In addition, when in the “bypass” or “idle” position, the flow of hydraulic fluid from the ground to the pumping assembly 500 or vice versa is relatively unobstructed, thereby allowing for high-speed round trips of fresh hydraulic fluid (e.g., 1.5 minutes / 1000 feet travel distance), which, as appropriate, allows for the use of the hydraulic fluid as a coolant to cool the pumping assembly, including the valve 60.

[0035]

[0053] As shown in Figure 2A, the power fluid 55 is guided by the valve 60 along the conduit 56B so as to enter the power supply assembly 504 to act on the second surface 112B of the power supply piston 112. The power supply piston 112 has a first surface 112A and a second surface 112B and can move based on the power fluid 55 acting on either of these surfaces, so the power supply piston 112 can be referred to as a dual-acting piston. The power supply piston 112 and the cylinder 528, and both thereof, are configured to accommodate the extension of the central conduit 508 through them. When the valve 60 is in the position shown in Figure 2A, the power fluid 55 in the first chamber of the cylinder 528 may be present on the side of the second surface 112B of the power supply piston 112 within the cylinder 528. As the power fluid 55 acts on the second surface 112B, the discharge fluid 65 is guided from within the cylinder 528 into the annular fluid space to return to the valve 60 via the conduit 66A. From the valve, the power fluid 65 enters the inner plenum 81 for return to the ground surface as described above. In the configuration of Figure 2A, the power supply piston 112 can be described as moving in a first direction, in this case in the up-hole direction.

[0036]

[0054] As shown in Figure 2B, the power fluid 55 is guided by valve 60 to enter the conduit 56B, move through the annular fluid space, and then enter the cylinder 528 to act on the first surface 112A of the power supply piston 112. The fluid on the opposite side of the power supply piston 112 loses its pressure due to valve 60 opening the discharge port. As the power supply piston 112 moves in a second direction, in this case in the downhole direction, the power fluid 65 is guided along conduit 66A to valve 60 for entry into the inner plenum 81 and for return to the ground, as described above.

[0037]

[0055] The power supply piston 112 is mechanically coupled or linked to the generating piston 135, which is a component of the generating fluid assembly 502. The mechanical coupling can be achieved by a sleeve 520 fixed at one end to the power supply piston 112 and at the other end to the generating piston 135. The sleeve 520 may be cylindrical in shape so as to accommodate a central conduit 508 around which the sleeve 520 is positioned. The sleeve 520 may slide along the outer surface of the central conduit 508, or a gap may exist between them. During operation, when the power supply piston 112 moves in a first direction, such as an up-hole, due to the position of the valve 60, the generating piston 135 will move in the same direction and over the same distance, which may also be referred to as the stroke length or stroke distance.

[0038]

[0056] The generating fluid assembly 506 includes an outer wall 530, which may form part of the outer housing of the pumping assembly 500, similar to the power assembly 502 and the power-supplying actuator assembly 504, or it may be a separate structure that defines the outer surface 500C of the pumping assembly 500 together with the outer walls of the power assembly 502 and the power-supplying actuator assembly 504.

[0039]

[0057] Furthermore, the generating fluid assembly 506 includes a cylinder 532 within which the generating piston 135 moves slidably in two directions. The cylinder 532 comprises a first end 532A defining a first end 500A and a second end 532B adjacent to the power-actuated assembly 504 (see Figure 2B). As will be understood by those skilled in the art, the generating fluid assembly 504 is configured to include various seals to perform the functions described herein. The generating piston 135, like the power-supplied piston 112, may be a dual-actuated piston having a first surface 135A and a second surface 135B. The cylinder 532 and piston 135 define two pumping chambers. A first fluid pumping chamber 130 is defined between the first surface 135A and the first end 532A, and a second fluid pumping chamber 132 is defined between the second surface 135B and the second end 532B. As the generating fluid piston 125 moves due to a movable linkage with the power supply piston 112, the volumes in the two chambers 130 and 132 change such that the volume of one increases and the volume of the other decreases, resulting in opposite pressure changes. For example, Figure 2A depicts a scenario in which the valve 60 guides the power fluid 55 into the power supply actuator assembly 504 so that the power supply piston 112 moves in the up-hole direction. Also, due to the sleeve 520, the generating fluid piston 135 moves in the up-hole direction, causing the volume of the first chamber 130 to decrease and the pressure inside it to increase. In the second chamber 132, as the generating fluid piston 135 moves in the up-hole direction, the volume increases and the pressure decreases. When valve 60 changes position to guide power fluid 55 into power-supplying actuator assembly 504, the opposite occurs: namely, the volume of the first chamber 130 increases and the pressure inside it decreases, and the volume of the second chamber 132 increases and the pressure inside it decreases.

[0040]

[0058] The outer wall 530 includes at least two groups of ports 23, 23A and two groups of valves 141, 142, which provide fluid communication between the outside of the outer wall 530 of the pumping assembly 500 and the inside of the cylinder 532. For example, port 23A (see Figure 2A) can provide fluid communication between the outside of the pumping assembly 500 and the first surface 135A of the generating piston 135. Port 23 (see Figure 2B) can provide fluid communication between the outside of the pumping assembly 500 and the second surface 135B of the generating piston 135. When the pumping assembly 500 is positioned in the well, the pumping assembly 500 is submerged in various fluids, including the generating fluid, and ports 23, 23A can be provided so that the generating fluid is received inside either of the chambers 130, 132 of the cylinder 532. Whether these fluid communication flow paths are opened or closed depends on the operating position of the valve assembly, which consists of valves 141, 142, 151, and 152, and the individual pressures in the chambers 130, 132, to which each valve controls fluid access. Valve 141 controls fluid communication between the second chamber 132 and port 23A to regulate the flow of generated fluid through port 23A. Valve 142 controls fluid communication between the second chamber and the annular fluid chamber 529 defined between the outer wall 530 and the cylinder 532. Valve 142 is configured to regulate the flow of pressurized and received generated fluid into the annular fluid chamber 529, from which the fluid flows through the first end 500A, through the connector 170, and into the fluid conduction system 606. The annular fluid chamber 529 extends between the first and second ends of the generated fluid assembly 506. Valve 151 controls fluid communication between the annular fluid chamber 529 and the connector 170. Valve 152 controls fluid communication between the first chamber 130 and the connector 170.

[0041]

[0059] Figure 2A shows two dotted lines A and B, where line A shows a cross-sectional cut through the valve assembly at the first end 532A of the generating fluid assembly 506. Line B shows a cross-sectional cut through the valve assembly at the second end 532B of the assembly 506. Together, lines A and B should be interpreted as representing the time when the valve 60 is directing the power fluid 55 to move the pistons 112 and 135 in the uphole. Figure 2B shows two further dotted lines C and D, where line C shows a cross-sectional cut through the valve assembly at the first end 532A, and line D shows a cross-sectional cut through the second end 532B. Together, lines B and C should be interpreted as representing the time when the valve is directing the power fluid 55 to move the pistons 112 and 135 in the downhole.

[0042]

[0060] Figure 3A shows cross-sectional views of lines A and B. Below line A, the outer surface is shown as the outer wall 530 as described above, which represents the outer surface 500C of the pumping assembly 500. Between the outer wall 530 and the outer surface of the cylinder 532 (not shown in this figure) is the annular fluid chamber 529. Facing the observer is the valve seat 155, which can define at least a portion of the first end 532A of the cylinder 532. Located in the center is the central conduit 508, which has an inner conduit 510 inside it. Figure 3A shows the operating positions of three sets of valves 151 and 152 and three sets of valves 141 and 152, although there may be more or fewer valves. Below line B, the outer wall 530 and the annular fluid chamber 529 are shown, as well as the valve seat 140, which can define at least a portion of the second end 532B of the cylinder 532. In Figure 3A, valves 151 and 142 are shaded to indicate that they are in a closed operating position to prevent fluid communication across them. Valves 152 and 141 are shown without shades to indicate that they are in an open operating position to allow fluid flow across them. Figure 3B shows the same structure as in Figure 3A, except that valves 152 and 141 are closed and valves 151 and 142 are open. The valves in the valve assembly may be one-way check valves, such as floating ball type valves, in which the position of the valve (open or closed) is determined by the differential pressure across the valve. For example, the open / closed position of the valves in Figure 3A is determined by the pressure in the fluid pumping chambers 130, 132 in relation to the pressure on the opposite side of each valve.

[0043]

[0061] For example, when pistons 112 and 135 move in the up-hole direction (as shown in Figure 2A), valve 60 can be opened so that the pressure in the second chamber 132 is less than the ambient pressure of the generated fluid surrounding the pumping assembly 500 and can continue to decrease the ambient pressure. This opens valve 141 so that the generated fluid can be received in the chamber 132 through port 23A. At the same time, the pressure in the annular fluid chamber 529 exceeds the pressure in chamber 132, which closes valve 142. As pistons 112 and 135 move in the up-hole direction, the pressure in the first chamber 130 increases and exceeds the ambient pressure of the generated fluid, which closes valve 151 and prevents reservoir fluid from being received in chamber 130. Also, the pressure in chamber 130 opens valve 152 so that the received (and pressurized) generated fluid inside it can flow out of the generated fluid assembly 506 and into connector 170. In fact, Figure 2A depicts the operating position of the valve assembly, where the generated fluid is drawn into the chamber 132 and pumped so that the received generated fluid in the chamber 130 is released into the connector 170.

[0044]

[0062] Figure 2B depicts the operating position of the valve assembly, with valves 141 and 152 closed and valves 151 and 142 open. This operating position guides the received generated fluid in chamber 132 to flow through the annular fluid chamber 529 and into connector 170, and to close the fluid communication between chamber 132 and the outside of generated fluid assembly 506. This operating position also allows new generated fluid to be received into chamber 130 via port 23.

[0045]

[0063] Figure 4 shows a pumping assembly 500 positioned within the well 15 and submerged in the generated fluid (shown as a white arrow) with a connector 170. The operating position of the valve assembly of the generated fluid assembly 506 is the same as that shown in Figures 2A and 3A, so that the generated fluid can be received in the chamber 132 of the generated fluid assembly 506 via port 23A. The connector 170 comprises a first end 170' operably coupled to the downhole end of the fluid conduction system 606 and a second end 170'' operably coupled to the first end 500A of the pumping system 500. The connector 170 is configured to provide fluid communication between the downhole end of the fluid conduction system 606 and the central bore of a channel for receiving and internalizing the conductive system 608. In Figure 4, connector 170 is simply shown as having an outer diameter exceeding the outer surface 500C of the pumping assembly 500, that is, to help illustrate the features and function of connector 170. In reality, connector 170 has an outer diameter less than or equal to the outer surface 500C. Connector 170 is configured to be operably coupled to the first end 500A of the pumping assembly 500. Specifically, connector 170 provides one or more internal conduits for conducting the pressurized and received generated fluid received from the generated fluid assembly 506 as described above. The fluid conduction system 606 includes a generated line 10 for conducting the pressurized and received generated fluid 25 from connector 170 up to the wellhead 20. The fluid conduction system 606 further includes a hydraulic conduction line 610 providing extensions for conduits 56 and 66 (see Figure 6A). Specifically, line 610 is configured to accommodate an extension 56A of a conduit 56 positioned within the conduit 66, which is optionally positioned concentrically within the conduit 66, such that the power fluid 55 enters the discharge fluid 65 through the fluid transmission system 606 and flows in the opposite direction.Line 610 is configured to be fluidically and in a sealed state connected to the string adapter 171 of connector 170 in order to accept and maintain the isolation and flow direction of the power fluid 55 and discharge fluid 65 to the internal fluid channel system 173 of connector 170, and to conduct them to fluid communication with the central conduit 508 (see Figure 6B). Specifically, the power fluid 55 in the conduit 56 of line 610 is conducted through the internal fluid channel system 173 of the string adapter 171, through connector 170, and into the inner conduit 510. The discharge fluid 66 flows through the annular space of the central conduit 508 and through the internal fluid channel system 173 in connector 170 so as to enter the extension 65A for conduction to the ground. Figure 6B shows the internal fluid channel system 173 having corners, but those skilled in the art will understand that it may be advantageous to round, smooth, or substantially straighten all corners in order to reduce, mitigate, or eliminate any adverse effects that such directional changes may have on maintaining the pressure of the power fluid 55.

[0046]

[0064] The connector 170 further comprises a generating string adapter 172 for connecting the generating conduit 10 to the connector 170 in a fluid and sealed state in order to facilitate the conduction of the pressurized generated fluid 25 received from the generated fluid assembly 506.

[0047]

[0065] The connector 170 further comprises an internal channel for conducting the conductor of the conductive system 608. This internal channel for the conductor is configured to receive the conductor from the outside of the fluid conduction system 606 in order to electrically transmit electrical signals from the controller 400 to the valve 60, and to internalize the conductor so that it may extend from the connector 170 through the internal channel of the pumping assembly 500.

[0048]

[0066] Figure 5 shows a variation of connector 170Z, and all other features described above in relation to Figures 4, 6A, and 6B are identical to those in Figure 5, except that the conductive system 608 is conducted downward through the well 15 inside the fluid conduction system 606. Specifically, the conductive system 606 can be positioned within the extension 66A such that the conductor is present in the lower-pressure discharge fluid 65. However, as will be understood by those skilled in the art, a properly and efficiently sealed conductor can also be conducted through the extension 56A of the fluid conduction system 606. The conductive system 608 allows electrical signals generated in the controller 400 to be transmitted in the downhole to change the operating position of the valve 60, as is known and generally understood in the art. Connector 170Z is configured to internalize the conductor of the conductive system 608, as described above for connector 170. Figure 6A illustrates a configuration in which the ground system 602 may be configured to receive and supply the correct fluid into the correct conduit of the fluid conduction system 606.

[0049]

[0067] Figure 7 shows another variation of system 600, where the fluid transport system 606A has three extending fluid conduits, with the first conduit (inner conduit) nested within the second conduit (intermediate conduit), and the second conduit nested within the third conduit (outer conduit). In some embodiments, the first, second, and third conduits can be configured coaxially and, optionally, concentrically. Collectively, the three extending fluid conduits may be referred to as a triple conduit. As shown in Figure 8A, the inner conduit may also be extending 55A, which is located within extending 65A, which is located within extending 10A of the generation line 10. Figure 8A illustrates a configuration in which the ground system 602 may be configured to receive and supply the correct fluid into the correct conduits of the fluid transport system 606A.

[0050]

[0068] Figure 8B shows a more detailed diagram of another variation of connector 170A used with the fluid conduction system 606A. Connector 170A can be configured to provide fluid communication for conducting pressurized generated fluid received from the generated fluid assembly 506, discharged fluid from the central conduit 508, and power fluid 55 to the inner conduit 510. Connector 170A may also be configured to internalize the conductors of the conduction system 608, as described above. Connector 170A includes a low-pressure latch 171B for fluid coupling with extension 66A, a high-pressure latch 172B for fluid coupling with extension 56A, and a generated coupler 173B such as a generated mandrel for fluid coupling with extension 10A.

[0051]

[0069] As will be understood by those skilled in the art, the conductor of system 608 may or may not be enclosed within one or more conduits of the fluid conduction system 606A.

[0052]

[0070] Figure 9 shows another variation of system 600, where the fluid transport system 606B comprises two sets of two nested fluid conduits. As shown in Figure 10A, each set of two nested fluid conduits includes an inner conduit and an outer conduit. One set of nested conduits 606B' may have extension 10A as the outer conduit and extension 66A as the inner conduit. The other set of nested conduits 606B'' may have extension 56A as the inner conduit and extension 10A as the outer conduit. Figure 10A illustrates how the ground system 602 may be configured to receive and supply the correct fluid into the correct conduits of the fluid transport system 606B.

[0053]

[0071] As those skilled in the art will understand, the conductor of system 608 may or may not be enclosed within one or more conduits of the fluid conduction system 606B.

[0054]

[0072] Figure 10B shows a more detailed diagram of another variation of connector 170B used with the fluid conduction system 606B. Connector 170B can be configured to provide fluid communication for conducting discharge fluid and power fluid 55 from the central conduit 508 to the inner conduit 510. Connector 170B can also be configured to internalize the conductors of the conduction system 608, as described above, or not. Connector 170B may comprise a scoop head 171C for fluidically and in a sealed state engaging with the outer surfaces of each pair of two nested fluid conduits, a low-pressure latch 172B configured to fluidly connect, moor, and seal with the extension 66A, a high-pressure latch 173B configured to fluidly connect, moor, and seal with the extension 56A, and a concentric string adapter 174B configured to connect the outer surface of the extension 10A to the scoop head 171C.

[0055]

[0073] Figure 11 shows another variation of system 600, where the fluid transport system 606C comprises one set of nested fluid conduits. As shown in Figure 12A, each set of two nested fluid conduits includes an inner conduit and an outer conduit. Within the set of nested conduits, extension 66A may be the outer conduit, and extension 56A may be the inner conduit. Both Figures 11 and 12 further show that well 15 can function as a conduit for guiding the pressurized and received generated fluid 25 to well 20. Figure 12A depicts a configuration in which the surface system 602 may be configured to receive and supply the correct fluid into the correct conduit of the fluid transport system 606C.

[0056]

[0074] Figure 12B shows a more detailed diagram of another variation of connector 170C used with a fluid conduction system 606C configured to provide fluid communication for conducting discharge fluid and power fluid 55 from the central conduit 508 to the inner conduit 510. Connector 170B is also configured to internalize the conductors of the conduction system 608, as described above, or not. Connector 170C further comprises one or more packing assemblies configured to connect to the outer surface of connector 170C and to establish a fluid seal in a press-fit state against the inner wall of the conduit 15. The packing assembly 175 may comprise, as understood in the art, one or more packing elements 175A and one or more anchor elements 175B, and a concentric string adapter for fluidically connecting extensions 55A and 66A to the internal fluid channel of the connector 170C, thereby allowing the pressurized received generated fluid to move in the uphole through the well 15 to the wellhead 20 after passing through the connector 170C.

[0057]

[0075] As those skilled in the art will understand, the conductor of system 608 may or may not be enclosed within one or more conduits of the fluid conduction system 606C.

[0058]

[0076] Figure 13 shows another variation of system 600, where the fluid transport system 606D comprises three separate fluid conduits. As shown in Figure 14A, extension 55A may be one of the separate fluid conduits, extension 66A may be one of the separate fluid conduits, extension 10A may be one of the separate fluid conduits, and extension 56A may be an inner conduit. Figures 11 and 12 further show that well 15 can function as a conduit for pressurizing and guiding the received generated fluid 25 to well 20. Figure 14A depicts a configuration in which the surface system 602 may be configured to receive and supply the correct fluid into the correct conduit of the fluid transport system 606D.

[0059]

[0077] Figure 14B shows a more detailed diagram of another variation of connector 170D used with a fluid conduction system 606D configured to provide fluid communication for conducting discharge fluid 65 and power fluid 55 from the central conduit 508 to the inner conduit 510. Furthermore, connector 170D may or may not be configured to internalize the conductors of the conduction system 608, as described above. Connector 170D may comprise a high-pressure string adapter 171D for fluidly connecting the appropriate internal fluid channel of connector 170D to the extension 56A, a low-pressure string adapter 172D for fluidly connecting the appropriate internal fluid channel of connector 170D to the extension 66A, and a generating string adapter for fluidly connecting the appropriate internal fluid channel of connector 170D to the extension 10A.

[0060]

[0078] Without being constrained by any particular theory, since valve 60 is positioned at the downhole end of the pumping assembly 500 in the well 15, the fluid in the hydraulic power conduits 56, 56A always flows downward to the pumping assembly 500, and the discharge fluid in conduits 65, 65A always flows upward. The flow directions of these fluids are not reversed so that the momentum effect on the thousands of feet of fluid contained within is negligible. As a result, a valve at the ground avoids a problem that can occur in systems where the hydraulic fluid flow direction is switched at the ground when the flow is stopped or its direction changes, causing the conduit, which was carrying the column of hydraulic fluid over the length between the surface switching valve and the hydraulic actuator piston, to first experience the stress resulting from the cessation of fluid flow, and consequently causing a drop in internal pressure above the associated actuator. This can generate a surge in internal conduit pressure in other conduits above the associated actuator because the pressure from above collides with the continuous upflow of hydraulic fluid in that conduit, which was previously upward and below pump pressure. These stresses resemble a “water hammer” effect, resulting in excessive and unnecessary stress and strain on the conduit, connectors, seals, couplings, and other fluid transmission equipment. In these hydraulic systems, the hydraulic power arriving from the ground source is mostly wasted reciprocating thousands of feet long of rapidly flowing pressurized oil column, leaving little power for the oil column to power the actuator at its lower end. This system 600 of the present disclosure can address this problem by positioning the valve 60 in a downhole location, and the power assembly 504 does not change the flow direction of the power fluid 55 or discharge fluid 65, thereby reducing or significantly eliminating the “water hammer” effect.

[0061]

[0079] The piston stroke length depends on the desired length of the rigid pumping assembly 500 that can accommodate the deflection of the well 15. Although the pistons 112 and 135 disclosed herein may have strokes of any length, the preferred range of stroke lengths is about 10 feet (approximate), similar to general or conventional suction rod pump equipment, which allows for the compatibility required with conventional hardware and methods.

[0062]

[0080] For the sake of clarity, it should be noted that valve 60 can actually be realized by a series of valves, one that cycles between closed (idle or bypass) and open (to allow flow to the next valve), and the next inline valve that cycles between the straight-through hydraulic circuit and the crossover hydraulic circuit. In this case, the bypass valve can be controlled from the ground, while the straight / crossover valve can be controlled locally (in the power assembly 502). Various possible control circuits and valve configurations are possible. In some embodiments, there may be a switching valve (a directional switching valve between the straight and crossover circuits) and two limit switches (one switch at or near the end of the stroke and another limit switch at the end of the linear motion of a piston, not necessarily the same piston, in the opposite direction of the stroke, assembled so that in the case of maximum stroke, the limit switch is located where the piston of the system is at the end of its linear motion in one direction) These limit switches may be wired to the ground by an electrical signal conduit electrically connected to the controller 400, which can guide the switching valve to the downhole to a straight-through or crossover position (and, if equipped, to a bypass position). Control signals can be provided from the downhole limit switches or from the ground controller system, depending on the configuration of the electrical control circuit and controller functions, and can be performed automatically or manually. Various stroke lengths can be utilized through feedback to the controller 400 between the ground flow sensing and control device, which can control the switches to change the direction of the hydraulic flow circuit within the actuator, or otherwise control the hydraulic fluid flow rate and power from the ground. To integrate all these complex controller functions, the PLC 402 plays a central role in the ground equipment, and all system equipment, including the valves 60 and all temperature and pressure devices located throughout the overall system, are centrally controlled and displayed by the PLC 402.

[0063]

[0081] As will be understood by those skilled in the art, this disclosure assumes further modifications of the above-described embodiments and variations of System 600. For example, the nested conduits may or may not be configured concentrically, and the conductors may or may not extend from the ground to the pumping assembly 500 inside the conduits of the fluid conduction system. Any given contents and flow directions of any conduit described herein can be replaced with different contents and flow directions when power fluid and discharge fluid are maintained, and when pressurized and retained generated fluid is guided to the wellhead for handling. The outer surface of the pumping assembly 500 may be defined by a separate housing, or by the outer wall of the power assembly 502, the outer wall of the power-supplying actuator assembly 506, and the outer wall of the generated fluid assembly 506. If the pumping assembly 500 does not include such a housing, the outer surface 500C has a substantially constant outer diameter and substantially no protruding members extending thereout and / or radially. Each of the assemblies 502, 504, and 506 is operably coupled together according to a mechanism known in the art, provided that such a mechanism does not interfere with the central conduit 508 extending from the first end 500A to the uphole end of the power assembly 502.

Claims

1. A downhole pumping assembly, a. A first end and a second end defining the outer surface between them, wherein the first end and the second end are both ends defining the longitudinal axis of the pumping assembly, the first end is closer to the pit entrance and the second end is further away from the pit entrance, and the outer surface has a substantially constant outer diameter, the first end and the second end and b. A power assembly located near the second end and configured to guide the power fluid, c. A generating fluid assembly comprising a generating piston located near the first end, configured to receive well fluid, and configured to guide the received well fluid toward the first end, d. A power supply type actuation assembly positioned adjacent to the power assembly and in fluid communication with the power assembly, wherein the power supply type actuation assembly is movably coupled to the generating fluid assembly, and the power supply type actuation assembly is configured to move the generating piston via the movably coupled assembly to receive the power fluid and to guide the received well fluid toward the first end, e. A central conduit extending from the first end to the power supply type actuation assembly for conducting the power fluid, f. An inner conduit positioned within the central conduit, wherein the inner conduit is configured to conduct a first fluid, an annular fluid passage is defined between the central conduit and the inner conduit, the annular fluid passage is configured to conduct a second fluid, the first fluid is at a first pressure, the second fluid is at a second pressure, the first pressure is different from the second pressure, the first fluid is the power fluid and the second fluid is the discharge fluid, or the first fluid is the discharge fluid and the second fluid is the power fluid, the inner conduit, A pumping assembly equipped with the following features.

2. The pumping assembly according to claim 1, wherein the inner conduit is configured to conduct the first fluid from the first end to the power assembly, and the annular fluid passage is configured to conduct the second fluid from the power assembly to the first end.

3. The pumping assembly according to claim 1 or 2, further comprising a conductive assembly for conducting an electrical signal from the first end to the power assembly, wherein the conductive assembly is located inside the outer surface.

4. The pumping assembly according to claim 3, wherein the power assembly includes a valve that can be switched under the control of an electrical signal to guide the power fluid to a first or second surface of the power supply piston of the power supply actuation assembly, the first surface being provided on the first end side and the second surface being provided on the second end side, and when the power fluid is guided to the second surface, both the power supply piston and the generating piston move in a first direction toward the first end to guide the received generated fluid toward the first end.

5. The pumping assembly according to claim 4, wherein when the switchable valve guides the power fluid to the first surface, the power supply piston and the generating piston move in a second direction toward the second end to guide the generated fluid received by the annular generated fluid chamber defined by the generated fluid assembly toward the first end.

6. The pumping assembly according to claim 4 or 5, wherein the generating fluid assembly further comprises a valve assembly configured to control fluid communication between the outer surface of the outer surface and a first surface provided on the first end side of the generating piston.

7. The pumping assembly according to claim 6, wherein the valve assembly is further configured to control fluid communication of the received generated fluid between the first surface and the first end of the generating piston.

8. The pumping assembly according to any one of claims 4 to 7, further comprising a second valve assembly configured to control fluid communication between the outer surface of the outer surface and a second surface provided on the second end side of the generating piston.

9. The pumping assembly according to claim 8, wherein the second valve assembly is further configured to control the fluid communication of the received generated fluid between the second surface of the generating piston and the annular generated fluid chamber defined by the generated fluid assembly.

10. The pumping assembly according to any one of claims 1 to 9, further comprising a connector coupled to the first end, wherein the connector is configured to provide fluid communication between the fluid conduction system and the central conduit.

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