Reversing valve assembly for hydraulic piston pumps and hydraulic piston pumps

Abstract

A reversing valve assembly for a hydraulic piston pump and the hydraulic piston pump itself are disclosed. The reversing valve assembly includes a reversing valve sleeve having a first radial hole, a second radial hole, a third radial hole, and a fourth radial hole spaced apart along the axial direction; a packer having an upper motor chamber flow channel, a waste fluid flow channel, a lower motor chamber flow channel, and a power fluid flow channel; the upper motor chamber flow channel communicates with the first radial hole and the upper motor chamber of the hydraulic piston pump; the waste fluid flow channel communicates with the second radial hole and the waste fluid chamber of the hydraulic piston pump; the lower motor chamber flow channel communicates with the third radial hole and the lower motor chamber of the hydraulic piston pump; the power fluid flow channel communicates with the fourth radial hole and the power fluid chamber of the hydraulic piston pump; and a reversing valve core movably installed in the reversing valve sleeve; the packer, the reversing valve sleeve, and the reversing valve core are coaxially arranged, with the packer fitted onto the reversing valve sleeve. This utility model modularizes the reversing valve assembly, facilitating its disassembly, assembly, and maintenance.

Description

Technical Field

[0001] This utility model relates to a reversing valve assembly for a hydraulic piston pump and the hydraulic piston pump itself, belonging to the technical field of oil and gas rodless drainage equipment manufacturing. Background Technology

[0002] Hydraulic piston pumps are an important branch of rodless well drainage equipment and a highly efficient mechanical drainage method. In certain situations, hydraulic piston pumps have proven irreplaceable. With the increasing exploitation of oil and gas reservoirs such as shale gas and coalbed methane, the depth of oil and gas reservoirs is constantly increasing, and the amount of water accumulated in wells is gradually increasing. Conventional drainage equipment, such as foam lift and velocity tubing, are becoming increasingly inadequate. Hydraulic piston pumps, due to their high efficiency, applicability to deep and deviated well operations, and mechanical drainage methods, are widely used in oil and gas field drainage operations.

[0003] However, directional valves are prone to wear, direct replacement is costly, and the installation and disassembly of directional valves in existing designs are cumbersome. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a reversing valve assembly for a hydraulic piston pump and a hydraulic piston pump. By setting a packer with internal threads and various flow channels, not only can the reversing function be realized, but the reversing valve assembly is also modularized, which facilitates the disassembly and assembly of the reversing valve assembly. By setting a reversing valve sleeve, only the vulnerable parts need to be replaced when wear occurs, thus extending the service life of other components.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0006] This utility model provides a reversing valve assembly for a hydraulic piston pump, the reversing valve assembly comprising:

[0007] A reversing valve sleeve, wherein a first radial hole, a second radial hole, a third radial hole and a fourth radial hole are provided at intervals along the axial direction;

[0008] A packer, comprising an upper motor cavity flow channel, a waste fluid flow channel, a lower motor cavity flow channel, and a power fluid flow channel; one end of the upper motor cavity flow channel is connected to the first radial hole, and the other end is connected to the upper motor cavity of the hydraulic piston pump; one end of the waste fluid flow channel is connected to the second radial hole, and the other end is connected to the waste fluid cavity of the hydraulic piston pump; one end of the lower motor cavity flow channel is connected to the third radial hole, and the other end is connected to the lower motor cavity of the hydraulic piston pump; one end of the power fluid flow channel is connected to the fourth radial hole, and the other end is connected to the power fluid cavity of the hydraulic piston pump; and

[0009] A reversing valve core, which is movably mounted in the reversing valve sleeve;

[0010] The packer, the reversing valve sleeve, and the reversing valve core are coaxially arranged, and the packer is fitted onto the reversing valve sleeve.

[0011] Preferably, the outer side of the reversing valve sleeve is provided with four annular flow channel grooves spaced axially. The number of the first radial hole, the second radial hole, the third radial hole and the fourth radial hole are multiple. The multiple first radial holes, the multiple second radial holes, the multiple third radial holes and the multiple fourth radial holes are evenly distributed along the circumference of the reversing valve sleeve. The first radial holes, the second radial holes, the third radial holes and the fourth radial holes are located in different flow channel grooves.

[0012] Preferably, the outer side of the reversing valve core is provided with a first annular groove and a second annular groove spaced apart along the axial direction, and the distance between the first annular groove and the first radial hole is less than the distance between the second annular groove and the first radial hole; the piston movement assembly of the hydraulic piston pump passes through the reversing valve core; the reversing valve sleeve is divided into a first volume chamber, a second volume chamber, a third volume chamber and a fourth volume chamber along the axial direction by the reversing valve core and the piston movement assembly.

[0013] Preferably, the reversing valve core is located in a first position, the first radial hole is connected to the second radial hole via the second volume chamber, and the third radial hole is connected to the fourth radial hole via the third volume chamber.

[0014] Preferably, the reversing valve core is located in the second position, the power fluid chamber of the hydraulic piston pump is connected to the first radial hole via the first volume chamber, and the second radial hole is connected to the third radial hole via the second volume chamber.

[0015] In order to communicate with other components of the hydraulic piston pump, the packer is also provided with a well fluid intake channel and a well fluid discharge channel.

[0016] Preferably, the length directions of the upper motor cavity flow channel, the depleted power fluid flow channel, the lower motor cavity flow channel, the power fluid flow channel, the well fluid intake flow channel, and the well fluid discharge flow channel are parallel to the axial direction of the packer.

[0017] Preferably, the reversing valve assembly further includes a sealing assembly, the sealing assembly including a sealing ring groove formed on the outside of the reversing valve sleeve and a sealing ring located in the sealing ring groove.

[0018] The packer has internal threads at both ends for connection to other components of the hydraulic piston pump.

[0019] This utility model also provides a hydraulic piston pump, which includes the reversing valve assembly described above.

[0020] In summary, this utility model, by setting a packer with internal threads and various flow channels, not only realizes the reversing function, but also modularizes the reversing valve assembly, facilitating the disassembly and assembly of the reversing valve assembly; by setting a reversing valve sleeve, only the vulnerable parts need to be replaced when wear occurs, thus extending the service life of other components.

[0021] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the directional valve assembly;

[0023] Figure 2 This is a schematic diagram of the packer structure;

[0024] Figure 3 A schematic diagram illustrating the different flow channels in the packer;

[0025] Figure 4 A cross-sectional view showing the flow channel of the upper motor cavity of the packer;

[0026] Figure 5 A cross-sectional view showing the waste fluid flow path of the packer;

[0027] Figure 6 A cross-sectional view showing the flow channel of the lower motor chamber of the packer;

[0028] Figure 7 A cross-sectional view showing the dynamic fluid flow path of the packer;

[0029] Figure 8 A cross-sectional view showing the well fluid intake channel of the packer;

[0030] Figure 9 A cross-sectional view showing the well fluid discharge channel of the packer;

[0031] Figure 10 A schematic diagram showing the piston motion assembly passing through the reversing valve core;

[0032] Figure 11 This is a schematic diagram of the reversing valve sleeve.

[0033] [Explanation of Labels in the Attached Image]

[0034] 1000 reversing valve assembly

[0035] 1100 packer

[0036] 1101 internal thread

[0037] 1110 Upper Motor Cavity Flow Channel

[0038] 1120 waste fluid flow channel

[0039] 1130 Lower Motor Cavity Flow Channel

[0040] 1140 Dynamic Fluid Flow Channel

[0041] 1150 Well Fluid Suction Channel

[0042] 1160 well fluid discharge channel

[0043] 1200 directional valve sleeve

[0044] 1210 flow channel groove

[0045] 1211 First radial hole

[0046] 1212 Second radial hole

[0047] 1213 Third radial hole

[0048] 1214 Fourth radial hole

[0049] 1221 First Volumetric Cavity

[0050] 1222 Second Volume Chamber

[0051] 1223 Third Volume Chamber

[0052] 1224 Fourth Volume Chamber

[0053] 1300 reversing valve core

[0054] 1400 sealing assembly

[0055] 1401 sealing ring groove

[0056] 2000 Piston Motion Components Detailed Implementation

[0057] Figure 1 This is a cross-sectional view of the directional valve assembly; Figure 2 This is a schematic diagram of the packer structure; Figure 3 A schematic diagram illustrating the different flow channels in the packer; Figure 4 A cross-sectional view showing the flow channel of the upper motor cavity of the packer; Figure 5 A cross-sectional view showing the waste fluid flow path of the packer; Figure 6 A cross-sectional view showing the flow channel of the lower motor chamber of the packer; Figure 7 A cross-sectional view showing the dynamic fluid flow path of the packer; Figure 8 A cross-sectional view showing the well fluid intake channel of the packer; Figure 9A cross-sectional view showing the well fluid discharge channel of the packer; Figure 10 A schematic diagram showing the piston motion assembly passing through the reversing valve core; Figure 11 This is a schematic diagram of the reversing valve sleeve. Figures 1 to 11 As shown, this utility model provides a reversing valve assembly 1000 for a hydraulic piston pump and a hydraulic piston pump. The reversing valve assembly 1000 includes a packer 1100, a reversing valve sleeve 1200, and a reversing valve core 1300 coaxially arranged. The packer 1100 is fitted onto the reversing valve sleeve 1200, and the reversing valve core 1300 is movably installed in the reversing valve sleeve 1200. The hydraulic piston pump includes the reversing valve assembly 1000.

[0058] The piston movement assembly 2000 of the hydraulic piston pump (e.g., piston rod, etc.) passes through the directional valve core 1300. The packer 1100 has internal threads 1101 at both ends for connection to other components of the hydraulic piston pump; for example, the packer 1100 can be connected to a multi-function connector of the hydraulic piston pump via the internal threads 1101. By providing the packer 1100, the directional valve assembly 1000 can be modularized, thereby simplifying maintenance and installation of the directional valve assembly 1000.

[0059] Four annular flow channels 1210 are provided on the outer side of the reversing valve sleeve 1200 along the axial direction. The flow channels 1210 are coaxially arranged with the reversing valve sleeve 1200. Each flow channel 1210 is provided with a set of radial holes, namely the first radial hole 1211, the second radial hole 1212, the third radial hole 1213 and the fourth radial hole 1214. Each set of radial holes is evenly distributed along the circumference.

[0060] In other words, the directional valve sleeve 1200 is provided with a first radial hole 1211, a second radial hole 1212, a third radial hole 1213, and a fourth radial hole 1214 spaced apart along the axial direction. The number of each of these holes is multiple, and they are evenly distributed circumferentially along the circumference of the directional valve sleeve 1200. Furthermore, each of these holes is located in a different flow channel groove 1210. By providing the directional valve sleeve 1200, when wear occurs in the friction pairs such as the valve core and the inner bore, only the directional valve sleeve needs to be replaced; there is no need to replace the packer. This separates the worn parts from the external packer structure, facilitating maintenance and replacement.

[0061] To separate different flow channels, static sealing is used between the radial holes. For example, the reversing valve assembly 1000 also includes a sealing assembly 1400. This invention does not limit the position, structure, and type of the sealing assembly; those skilled in the art can design and select according to actual conditions. For example, the sealing assembly 1400 can be a sealing ring groove 1401 formed on the outside of the reversing valve sleeve 1200 and a sealing ring located in the sealing ring groove 1401.

[0062] The outer side of the reversing valve core 1300 is provided with a first annular groove 1310 and a second annular groove 1320 spaced apart along the axial direction. The distance between the first annular groove 1310 and the first radial hole 1211 is smaller than the distance between the second annular groove 1320 and the first radial hole 1211.

[0063] The directional valve sleeve 1200 is axially divided into a first volume chamber 1221, a second volume chamber 1222, a third volume chamber 1223, and a fourth volume chamber 1224 by the directional valve core 1300 and the piston movement assembly 2000.

[0064] Specifically, the first volumetric chamber 1221 is connected to the power fluid chamber of the hydraulic piston pump (not shown in the figure).

[0065] The second volume chamber 1222 is the space formed by the outer wall of the first annular groove 1310 of the reversing valve core 1300 and the inner wall of the reversing valve sleeve 1200; the third volume chamber 1223 is the space formed by the second annular groove 1320 of the reversing valve core 1300 and the inner wall of the reversing valve sleeve 1200.

[0066] Different connection methods can be achieved by changing the position of the reversing valve core 1300.

[0067] For example, when the reversing valve core 1300 is in the first position ( Figure 10 When the reversing valve sleeve 1200 is in its leftmost position, the second volume chamber 1222 (or the first annular groove 1310) can connect the first radial hole 1211 with the second radial hole 1212, and the third volume chamber 1223 (or the second annular groove 1320) can connect the third radial hole 1213 with the fourth radial hole 1214.

[0068] When the reversing valve core 1300 is in the second position ( Figure 10 When the directional valve sleeve 1200 is in its rightmost position, the first volumetric cavity 1221 can connect the power fluid chamber of the hydraulic piston pump with the first radial hole 1211, and the second volumetric cavity 1222 (or the first annular groove 1310) can connect the second radial hole 1212 with the third radial hole 1213. The first position is closer to the first radial hole 1211 than the second position.

[0069] The fourth volume chamber 1224 is a pressure control chamber. By changing the position of the piston movement assembly 2000, the fourth volume chamber 1224 is connected to the power fluid chamber or the depletion fluid chamber of the hydraulic piston pump (not shown in the figure), thereby introducing different pressures into the fourth volume chamber 1224. This causes the force state of the reversing valve core 1300 to change alternately, realizing the axial movement of the reversing valve core 1300. Furthermore, during the axial movement of the reversing valve core 1300, different conduction connection forms are generated on the radial holes of the other reversing valve sleeves 1200, realizing the reversing process.

[0070] Figures 4 to 9 The diagram shows the structural schematics of the flow channels in different longitudinal sections of the packer 1100. The packer 1100 is provided with an upper motor cavity flow channel 1110, a waste fluid flow channel 1120, a lower motor cavity flow channel 1130, and a power fluid flow channel 1140.

[0071] One end of the upper motor cavity flow channel 1110 is connected to the first radial hole 1211, and the other end is connected to the upper motor cavity of the hydraulic piston pump; one end of the waste power fluid flow channel 1120 is connected to the second radial hole 1212, and the other end is connected to the waste power fluid cavity of the hydraulic piston pump; one end of the lower motor cavity flow channel 1130 is connected to the third radial hole 1213, and the other end is connected to the lower motor cavity of the hydraulic piston pump; one end of the power fluid flow channel 1140 is connected to the fourth radial hole 1214, and the other end is connected to the power fluid cavity of the hydraulic piston pump.

[0072] In addition to the aforementioned flow channels, other flow channels may be provided within the packer 1100 to connect with other components of the hydraulic piston pump, such as the well fluid suction flow channel 1150 and the well fluid discharge flow channel 1160. This invention does not limit the position, number, or length of the flow channels; those skilled in the art can design and select according to their needs, as long as it ensures that each flow channel does not interfere with the others. Preferably, the length direction of each flow channel is parallel to the axial direction of the packer 1100, and each flow channel connects to other components through radial holes located at both ends.

[0073] The working process of the reversing valve assembly of this utility model is explained below with examples.

[0074] When the reversing valve core 1300 is in the first position ( Figure 10 When the reversing valve sleeve 1200 is in its leftmost position, the first radial hole 1211 of the reversing valve sleeve 1200 is connected to the second radial hole 1212, and the third radial hole 1213 is connected to the fourth radial hole 1214; at this time, the upper motor cavity is connected to the power fluid flow channel 1120, and the lower motor cavity is connected to the power fluid flow channel 1140.

[0075] As high-pressure hydraulic fluid is injected into the hydraulic piston pump, the upper and lower pistons of the pump experience a resultant force. For example, the direction of the resultant force is... Figure 10In the direction from right to left, the pressure difference will push the piston movement assembly 2000 to move to the left. At this time, the volume chamber of the lower pump piston chamber gradually decreases. When the internal well fluid is compressed to a pressure greater than that of the waste fluid, the liquid in the lower pump chamber will mix with the waste fluid through the discharge valve assembly and be lifted to the surface, thus completing the discharge process of the lower pump chamber.

[0076] During this process, the volume of the upper pump chamber gradually increases. Under the combined effects of well fluid pressure and negative pressure generated by the expansion of the piston chamber volume, the well fluid begins to enter the upper pump chamber through the suction valve assembly. The upper pump chamber will complete the suction process during the entire movement.

[0077] When the piston movement assembly 2000 moves to the left limit position, the fourth volume chamber 1224 connects with the depleted fluid chamber, and the fourth volume chamber 1224 begins to depressurize. The resultant force on the reversing valve core 1300 is to the right, and it begins to move to the right. When the reversing valve core 1300 is in the second position ( Figure 10 When the reversing valve sleeve 1200 is in its rightmost position, the first volume chamber 1221 is connected to the first radial hole 1211, and the second radial hole 1212 is connected to the third radial hole 1213; at this time, the upper motor chamber is connected to the power fluid flow channel 1140, and the lower motor chamber is connected to the waste power fluid flow channel 1120.

[0078] At this moment, the resultant force on the upper and lower pistons is to the right, and the piston motion assembly 2000 moves to the right to complete the reversing action. The suction and discharge valve assembly simultaneously completes the liquid suction and discharge process.

[0079] In summary, this utility model, by setting a packer with internal threads and various flow channels, not only realizes the reversing function, but also modularizes the reversing valve assembly, facilitating the disassembly and assembly of the reversing valve assembly; by setting a reversing valve sleeve, only the vulnerable parts need to be replaced when wear occurs, thus extending the service life of other components.

Claims

1. A reversing valve assembly for a hydraulic piston pump, characterized in that, The reversing valve assembly includes: A reversing valve sleeve, wherein a first radial hole, a second radial hole, a third radial hole and a fourth radial hole are provided at intervals along the axial direction; A packer, comprising an upper motor cavity flow channel, a waste fluid flow channel, a lower motor cavity flow channel, and a power fluid flow channel; one end of the upper motor cavity flow channel is connected to the first radial hole, and the other end is connected to the upper motor cavity of the hydraulic piston pump; one end of the waste fluid flow channel is connected to the second radial hole, and the other end is connected to the waste fluid cavity of the hydraulic piston pump; one end of the lower motor cavity flow channel is connected to the third radial hole, and the other end is connected to the lower motor cavity of the hydraulic piston pump; one end of the power fluid flow channel is connected to the fourth radial hole, and the other end is connected to the power fluid cavity of the hydraulic piston pump; and A reversing valve core, which is movably mounted in the reversing valve sleeve; The packer, the reversing valve sleeve, and the reversing valve core are coaxially arranged, and the packer is fitted onto the reversing valve sleeve.

2. A reversing valve assembly for a hydraulic piston pump as defined in claim 1, characterized in that The outer side of the reversing valve sleeve is provided with four annular flow channel grooves spaced axially. The number of the first radial hole, the second radial hole, the third radial hole and the fourth radial hole are multiple. The multiple first radial holes, the multiple second radial holes, the multiple third radial holes and the multiple fourth radial holes are evenly distributed along the circumference of the reversing valve sleeve. The first radial holes, the second radial holes, the third radial holes and the fourth radial holes are located in different flow channel grooves.

3. A reversing valve assembly for a hydraulic piston pump as defined in claim 2, characterized in that The outer side of the reversing valve core is provided with a first annular groove and a second annular groove spaced apart along the axial direction. The distance between the first annular groove and the first radial hole is less than the distance between the second annular groove and the first radial hole. The piston movement assembly of the hydraulic piston pump passes through the reversing valve core. The reversing valve sleeve is divided into a first volume chamber, a second volume chamber, a third volume chamber, and a fourth volume chamber along the axial direction by the reversing valve core and the piston movement assembly.

4. The reversing valve assembly for a hydraulic piston pump as described in claim 3, characterized in that, The reversing valve core is located in the first position, the first radial hole is connected to the second radial hole via the second volume chamber, and the third radial hole is connected to the fourth radial hole via the third volume chamber.

5. The reversing valve assembly for a hydraulic piston pump as described in claim 3, characterized in that, The reversing valve core is located in the second position, the power fluid chamber of the hydraulic piston pump is connected to the first radial hole via the first volume chamber, and the second radial hole is connected to the third radial hole via the second volume chamber.

6. The reversing valve assembly for a hydraulic piston pump as described in claim 1, characterized in that, The packer is also equipped with a well fluid intake channel and a well fluid discharge channel.

7. The reversing valve assembly for a hydraulic piston pump as described in claim 6, characterized in that, The length directions of the upper motor cavity flow channel, the depleted power fluid flow channel, the lower motor cavity flow channel, the power fluid flow channel, the well fluid intake flow channel, and the well fluid discharge flow channel are parallel to the axial direction of the packer.

8. The reversing valve assembly for a hydraulic piston pump as described in claim 1, characterized in that, The reversing valve assembly also includes a sealing assembly, which includes a sealing ring groove formed on the outside of the reversing valve sleeve and a sealing ring located in the sealing ring groove.

9. The reversing valve assembly for a hydraulic piston pump as described in claim 1, characterized in that, The packer has internal threads at both ends.

10. A hydraulic piston pump, characterized in that, The hydraulic piston pump includes a reversing valve assembly as described in any one of claims 1-9.

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