Fluid end

Abstract

The utility model discloses a fluid end, and relates to the field of oil and gas equipment. A fluid end comprises a valve box, a plunger and a packing assembly. The valve box is provided with a plunger channel, and the plunger is movably arranged in the plunger channel; the packing assembly comprises a packing box and a packing body, the packing box is detachably arranged on the side portion of the valve box, the plunger is sleeved with the packing box, and the packing body is connected between the plunger and the packing box in a sealed mode. The problems of high maintenance difficulty, high cost and the like caused by overall maintenance or replacement of the valve box can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas equipment, and particularly relates to a hydraulic end. BACKGROUND

[0002] In the development process of oil and gas fields, the fracturing process is a main method for reservoir reconstruction and yield increase of oil and gas reservoirs, and the process is mainly realized through fracturing pumping equipment. The role of the fracturing pumping equipment is to inject high-pressure and large-displacement fracturing fluid into the oil and gas reservoir, to press the formation, to squeeze the proppant into the fracture, to form an artificial fracture and a flow channel, and to improve the oil and gas recovery rate.

[0003] The hydraulic end is an important component of the fracturing equipment and the fracturing plunger pump, and bears the alternating load of high pressure and the continuous erosion of the sand-carrying fracturing fluid in the construction process, so that the disc root cavity of the hydraulic end is worn and cannot be sealed.

[0004] Since the disc root cavity is arranged in the valve box, when the disc root cavity is worn, the entire valve box needs to be repaired or replaced, which not only increases the repair difficulty, but also increases the cost. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the embodiment of the application is to provide a hydraulic end which can solve the problems of high repair difficulty and high cost caused by the overall repair or replacement of the valve box.

[0006] In order to solve the above technical problems, the application is implemented as follows:

[0007] The embodiment of the application provides a hydraulic end, which comprises a valve box, a plunger and a disc root assembly.

[0008] The valve box is provided with a plunger channel, and the plunger is movably arranged in the plunger channel.

[0009] The disc root assembly comprises a disc root box and a disc root body, the disc root box is detachably arranged on the side of the valve box, the disc root box is sleeved on the outer side of the plunger, and the disc root body is sealingly connected between the plunger and the disc root box.

[0010] The disc root box in the embodiment of the application is detachably mounted to the side of the valve box, and the installation of the disc root body is realized through the disc root box. In this way, the disc root body can play a sealing role between the plunger and the disc root box, and when the disc root box is worn, the disc root box can be detached from the valve box and repaired or replaced, so that the overall repair of the valve box is not needed, and the overall scrapping of the valve box is also avoided, thereby the repair difficulty can be reduced, and the cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The structure schematic diagram of the hydraulic end disclosed in the embodiment of the application is shown in the figure.

[0012] Figure 2 A cross-sectional view of a hydraulic end disclosed in embodiments of the present application;

[0013] Figure 3 A first structural view of a valve box disclosed in embodiments of the present application;

[0014] Figure 4 A second structural view of a valve box disclosed in embodiments of the present application;

[0015] Figure 5 A cross-sectional view of a packing element disclosed in embodiments of the present application;

[0016] Figure 6 A structural view of a packing box disclosed in embodiments of the present application;

[0017] Figure 7 A cross-sectional view of a packing box disclosed in embodiments of the present application;

[0018] Figure 8 A cross-sectional view of a packing cap disclosed in embodiments of the present application;

[0019] Figure 9 A partial view of a packing assembly disclosed in embodiments of the present application.

[0020] Explanation of Reference Signs:

[0021] 10 - valve box; 11 - plunger passage; 12 - first sink; 13 - first mounting hole; 14 - mounting groove; 15 - suction passage; 16 - second sink; 17 - third mounting hole;

[0022] 20 - plunger;

[0023] 30 - packing assembly;

[0024] 31 - packing box; 311 - central passage; 312 - second mounting hole; 313 - lubricating hole;

[0025] 32 - packing element;

[0026] 33 - packing cap;

[0027] 40 - seal ring; 41 - first end portion; 42 - second end portion; 43 - inclined surface;

[0028] 51 - seal ring;

[0029] 61 - valve box cap; 62 - suction cap; 63 - suction cover; 631 - plugging portion; 632 - pressing portion;

[0030] 70 - first valve assembly;

[0031] 80 - second valve assembly. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0033] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally represents a "or" relationship between the front and rear associated objects.

[0034] The embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments and their application scenarios.

[0035] Reference Figures 1 to 9 The embodiments of the present application disclose a hydraulic end, the disclosed hydraulic end comprises a valve box 10, a plunger 20 and a packing assembly 30.

[0036] The valve box 10 is a contact member, which can provide a mounting base for the plunger 20, the packing assembly 30, etc. The valve box 10 is provided with a plunger channel 11, and the plunger 20 is movably arranged in the plunger channel 11. In this way, the pressurization of the fracturing fluid can be realized by the reciprocating movement of the plunger 20 in the plunger channel 11, so as to obtain high-pressure fracturing fluid.

[0037] The packing assembly 30 is used to play a sealing role between the valve box 10 and the plunger 20, so as to prevent the fracturing fluid from leaking from the gap between the valve box 10 and the plunger 20. The packing assembly 30 can include a packing box 31 and a packing body 32, the packing box 31 can be mounted to the valve box 10, and the packing body 32 can be arranged in the packing box 31.

[0038] Further, the packing box 31 is detachably arranged at the side of the valve box 10. Based on this, the installation of one end of the packing box 31 is realized, the installation stability of the packing box 31 is ensured, and the disassembly of the packing box 31 is also facilitated, so as to facilitate the maintenance or replacement of the packing box 31.

[0039] The disc root box 31 is sleeved outside the plunger 20, and the disc root body 32 is sealingly connected between the plunger 20 and the disc root box 31. Thus, the disc root box 31 can bear the disc root body 32, and the disc root body 32 can seal the plunger 20 and the disc root box 31 to prevent the fracturing fluid from leaking from the gap between the plunger 20 and the disc root box 31.

[0040] Based on the above arrangement, the disc root box 31 in the embodiment of the application is detachably mounted to the side of the valve box 10, and the disc root box 31 is used to mount the disc root body 32. Thus, the disc root body 32 can seal the plunger 20 and the disc root box 31, and when the disc root box 31 is worn, the disc root box 31 can be detached from the valve box 10 for maintenance or replacement, without the need to maintain the valve box 10 as a whole, and the valve box 10 as a whole will not be scrapped, thereby reducing the difficulty of maintenance and reducing costs.

[0041] In some embodiments, the disc root box 31 can be provided with a central passage 311, the plunger 20 is movably arranged in the central passage 311, and the disc root body 32 is sealingly connected between the inner wall of the central passage 311 and the outer wall of the plunger 20. Thus, the disc root body 32 can sealingly connect the plunger 20 and the disc root box 31.

[0042] Optionally, the port of the plunger passage 11 can be provided with a first recess 12, and one end of the disc root box 31 is embedded in the first recess 12. Based on this, the outer periphery of the disc root box 31 can be limited by the groove wall of the first recess 12, thereby improving the installation stability of the disc root box 31.

[0043] To further improve the installation stability of the disc root box 31 and prevent the disc root box 31 from being pulled out of the first recess 12, the disc root box 31 can be provided with a plurality of second mounting holes 312, and the plurality of second mounting holes 312 are distributed around the periphery of the central passage 311 along the circumference of the disc root box 31. Correspondingly, the groove bottom of the first recess 12 can be provided with a plurality of first mounting holes 13 arranged along the circumference of the first recess 12, and the plurality of second mounting holes 312 and the plurality of first mounting holes 13 are one-to-one correspondingly arranged.

[0044] Further, the fluid end can further include a plurality of first fasteners, each first fastener being mounted to a corresponding first mounting hole 13 and second mounting hole 312.

[0045] Based on the above arrangement, the disc root box 31 can be firmly mounted to the valve box 10 by the plurality of first fasteners, so as to ensure the installation stability of the disc root box 31 and prevent the disc root box 31 from moving randomly relative to the valve box 10.

[0046] Optionally, the first mounting hole 13 can be a threaded hole, the second mounting hole 312 can be a smooth hole, and the first fastener can be a screw rod, so that the first fastener can be conveniently disassembled through threaded connection, thereby facilitating maintenance or replacement of the packing box 31.

[0047] It should be noted that the first sink groove 12 has a limiting effect on the packing box 31 to ensure the stability of the packing box 31 in the radial direction, and the plurality of first fasteners can limit the packing box 31 in the axial direction to ensure the stability of the packing box 31 in the axial direction.

[0048] In some embodiments, the side wall of the plunger channel 11 can be provided with a mounting groove 14 communicating with the first sink groove 12. Specifically, the mounting groove 14 can extend from the groove bottom of the first sink groove 12 along the arrangement direction of the plunger channel 11, so that the mounting groove 14 can be formed at the end of the plunger channel 11 close to the first sink groove 12, wherein the cross-sectional area of the mounting groove 14 is greater than that of the plunger channel 11 and less than that of the first sink groove 12.

[0049] The hydraulic end can further include a sealing ring 40 sleeved on the outside of the plunger 20 and connected between the valve box 10 and the packing box 31, so that the sealing ring 40 can seal the connection between the valve box 10 and the packing box 31 to prevent the fracturing fluid from leaking from the connection between the valve box 10 and the packing box 31.

[0050] The sealing ring 40 can include a first end portion 41 and a second end portion 42 arranged in the axial direction, the first end portion 41 is inserted into the mounting groove 14, and the second end portion 42 is inserted into the packing box 31. Based on this arrangement, the first end portion 41 can be located between the inner wall of the mounting groove 14 and the outer wall of the plunger 20 to achieve a sealing effect; the second end portion 42 can be located between the inner wall of the central channel 311 of the packing box 31 and the outer wall of the plunger 20 to achieve a sealing effect.

[0051] Optionally, the outer circumferential surface of the first end portion 41 and the inner wall of the mounting groove 14 can be in interference fit to ensure the sealing property; the inner circumferential surface of the first end portion 41 and the outer wall of the plunger 20 can be in transition fit or clearance fit to ensure that the plunger 20 can slide relative to the first end portion 41. Of course, the plunger 20 and the first end portion 41 can be provided with lubricating oil, lubricating grease, etc., which can not only play a lubricating role but also play a sealing role.

[0052] The outer circumferential surface of the second end portion 42 can be in interference fit with the inner wall of the central passage 311 of the packing box 31 to ensure the sealing performance; the inner circumferential surface of the second end portion 42 can be in transition fit or clearance fit with the outer wall of the plunger 20 to ensure that the plunger 20 can slide relative to the second end portion 42, of course, the plunger 20 and the second end portion 42 can be provided with lubricating oil, lubricating grease, etc., which can play the lubricating and sealing roles.

[0053] Since the packing base 32 is arranged in the central passage 311 of the packing box 31, the packing base 32 and the sealing ring 40 can abut in the axial direction of the packing box 31 to limit the axial position of the packing base 32 by the sealing ring 40.

[0054] In some embodiments, the outer circumferential surface of the first end portion 41 can be a cylindrical surface or a conical surface. When it is a conical surface, it can be beneficial to increase the extrusion force between the outer circumferential surface of the first end portion 41 and the inner wall of the mounting groove 14, thereby achieving better sealing effect.

[0055] The outer circumferential surface of the second end portion 42 can be a cylindrical surface or a conical surface. When it is a conical surface, it can be beneficial to increase the extrusion force between the outer circumferential surface of the second end portion 42 and the inner wall of the central passage 311, thereby achieving better sealing effect.

[0056] In addition, the connection between the outer circumferential surface and the end surface of the first end portion 41 can be provided with an inclined surface 43, i.e., a chamfer structure is formed at the connection between the outer circumferential surface and the end surface, on the one hand, the inclined surface 43 can be used for positioning to facilitate the insertion of the first end portion 41 into the mounting groove 14, on the other hand, it can also effectively prevent the first end portion 41 from scratching the inner wall of the mounting groove 14.

[0057] To further improve the sealing performance, the fluid end can further include a sealing ring 51, which is sealingly connected between the end surface of the packing box 31 and the bottom of the first sink groove 12. Based on this, the sealing ring 51 can be used to seal between the end surface of the packing box 31 and the bottom of the first sink groove 12 to ensure the sealing performance.

[0058] Optionally, the sealing ring 51 can be located at the connection between the end surface of the packing box 31, the bottom of the first sink groove 12 and the sealing ring 40, in this way, the sealing ring 51 can be used to achieve the sealing effect at the connection of the three.

[0059] In some embodiments, the packing assembly 30 may further include a packing cap 33, which is sleeved on the outside of the plunger 20 and threadedly connected to the central channel 311, and the packing cap 33 presses against the packing body 32. Specifically, the outer circumferential surface of the packing cap 33 may be provided with external threads, and the central channel 311 of the packing box 31 may be provided with internal threads. In this way, the packing cap 33 and the packing box 31 can be stably installed through the cooperation of the external and internal threads, and the packing cap 33 can be easily installed and removed. In addition, the packing cap 33 can also limit the packing body 32 axially to ensure the axial stability of the packing body 32.

[0060] Optionally, the plunger 20 can also pass through the packing cap 33, and a sealing ring can be provided between the plunger 20 and the packing cap 33 to provide a sealing effect and prevent fracturing fluid from leaking from the gap between the plunger 20 and the packing cap 33.

[0061] In some embodiments, the side wall of the packing box 31 may be provided with a lubrication hole 313, which communicates with the central channel 311. Thus, lubricating oil or grease can be injected into the central channel 311 through the lubrication hole 313 to ensure lubrication between the plunger 20 and the packing box 31. It should be noted that the packing body 32 is located between the inner wall of the central channel 311 and the outer wall of the plunger 20. Lubricating oil or grease can be delivered to the packing body 32 through the lubrication hole 313 to achieve a lubrication effect between the packing body 32 and the plunger 20. Of course, the lubricating oil or grease can also play a certain sealing role.

[0062] In some embodiments, the valve box 10 may also be provided with a suction channel 15, which is coaxially arranged with the plunger channel 11, and a second sink 16 is provided at the port of the suction channel 15.

[0063] Additionally, the hydraulic end may also include a valve box cap 61, a suction cap 62, and a suction cover 63. The suction cover 63 may include a blocking part 631 and a pressing part 632. The blocking part 631 is located within the suction channel 15, the pressing part 632 is located in the second settling tank 16, the suction cap 62 is located on the valve box cap 61 and abuts against the pressing part 632, and the valve box cap 61 is detachably connected to the valve box 10.

[0064] Based on the above setting, the stable connection between the valve box pressure cap 61 and the valve box 10 can be ensured, and the installation stability of the valve box pressure cap 61 can be ensured. The suction pressure cap 62 can be installed through the valve box pressure cap 61, so as to ensure the installation stability of the suction pressure cap 62. The suction passage 15 can be blocked by the blocking part 631 of the suction pressure cover 63, so as to prevent the fracturing fluid from leaking from the suction passage 15. The suction pressure cover 63 can be extruded and limited by the suction pressure cap 62, so as to ensure that the suction pressure cover 63 can be tightly matched with the valve box 10.

[0065] Optionally, the valve box 10 can be provided with a plurality of third mounting holes 17 on the outer periphery of the second sink groove 16. Correspondingly, the valve box pressure cap 61 can be provided with a central hole and a plurality of fourth mounting holes. The plurality of fourth mounting holes are distributed on the periphery of the central hole along the circumference of the valve box pressure cap 61, and are arranged one by one corresponding to the plurality of third mounting holes 17. The suction pressure cap 62 is threadedly connected to the central hole.

[0066] Further, the fluid end can further include a second fastener, each second fastener being mounted to a corresponding third mounting hole 17 and fourth mounting hole.

[0067] Based on the above setting, the valve box pressure cap 61 can be firmly mounted to the valve box 10 through a plurality of second fasteners, so as to ensure the installation stability of the valve box pressure cap 61 and prevent the valve box pressure cap 61 from moving randomly relative to the valve box 10.

[0068] Optionally, the third mounting hole 17 can be a threaded hole, the fourth mounting hole can be a smooth hole, and the second fastener can be a screw rod. In this way, the second fastener can be conveniently disassembled through threaded connection, so as to facilitate the maintenance or replacement of the valve box pressure cap 61.

[0069] It should be noted here that the sink wall of the second sink groove 16 limits the suction pressure cover 63, so as to ensure the stability of the suction pressure cover 63 in the radial direction. The suction pressure cap 62 can limit the suction pressure cover 63 in the axial direction of the suction pressure cover 63, so as to ensure the stability of the suction pressure cover 63 in the axial direction.

[0070] In some embodiments, the fluid end can further include a first valve assembly 70 and a second valve assembly 80. Correspondingly, the valve box 10 can be provided with a liquid inlet passage and a liquid outlet passage. The first valve assembly 70 is arranged in the liquid inlet passage, and the second valve assembly 80 is arranged in the liquid outlet passage.

[0071] In addition, the fluid end can further include other structures to meet the working requirements of the fluid end. Here, the specific structure of the fluid end and its working principle are not described in detail, and specific reference can be made to related technologies.

[0072] The specific working process of the fluid end is as follows:

[0073] During operation, the power end drives the plunger 20 to reciprocate. When the plunger 20 moves outward, the volume of the fluid end inner cavity increases, and the working medium (such as fracturing fluid) is sucked from the suction hole of the valve box 10, so that the first valve assembly 70 is opened, and at the same time, the second valve assembly 80 is closed, so that the fracturing fluid can be sucked into the working cavity. When the plunger 20 moves inward, the volume of the fluid end inner cavity decreases, and the fracturing fluid pressure increases, the first valve assembly 70 is closed, and the second valve assembly 80 is opened under the action of pressure, and the fracturing fluid is discharged outward through the discharge hole of the valve box 10. Therefore, the process of sucking low-pressure fracturing fluid and discharging high-pressure fracturing fluid is realized.

[0074] During operation, the connecting threads of the suction end bear high-pressure alternating loads. When the threads are damaged, the valve box pressure cap 61, the suction pressure cap 62 and other components can be quickly repaired or replaced to protect the main body of the valve box 10 from being damaged. In addition, with the reciprocating movement of the plunger 20, the packing box 31 will be worn out, so the packing box 31 can be quickly repaired or replaced before the packing box 31 is damaged to ensure that the main body of the valve box 10 is not damaged.

[0075] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are only illustrative and not limiting. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope of protection of the claims, and all forms belong to the protection of the present application.

Claims

1. A hydraulic end, characterized in that, include: Valve box (10), plunger (20) and packing assembly (30); The valve box (10) is provided with a plunger channel (11), and the plunger (20) is movably disposed in the plunger channel (11). The packing assembly (30) includes a packing box (31) and a packing body (32). The packing box (31) is detachably disposed on the side of the valve box (10) and is sleeved on the outside of the plunger (20). The packing body (32) is sealed between the plunger (20) and the packing box (31). The side wall of the plunger channel (11) is provided with an installation groove (14). The hydraulic end also includes a sealing ring (40). The sealing ring (40) is sleeved on the outside of the plunger (20). The sealing ring (40) includes a first end (41) and a second end (42) arranged along the axial direction. The first end (41) is inserted into the installation groove (14), and the second end (42) is inserted into the packing box (31).

2. The hydraulic end according to claim 1, characterized in that, The plunger channel (11) has a first sinker (12) at its port, and one end of the packing box (31) is embedded in the first sinker (12).

3. The hydraulic end according to claim 2, characterized in that, The bottom of the first settling tank (12) is provided with a plurality of first mounting holes (13) arranged circumferentially along the first settling tank (12). The packing box (31) is provided with a central channel (311) and a plurality of second mounting holes (312). The plunger (20) is movably disposed in the central channel (311). The packing body (32) is sealed between the inner wall of the central channel (311) and the outer wall of the plunger (20). The plurality of second mounting holes (312) are distributed around the periphery of the central channel (311) along the circumference of the packing box (31) and are provided in correspondence with the plurality of first mounting holes (13). The hydraulic end also includes a plurality of first fasteners, each of which is installed into the corresponding first mounting hole (13) and second mounting hole (312).

4. The hydraulic end according to claim 2, characterized in that, The mounting groove (14) is connected to the first sinking groove (12).

5. The hydraulic end according to claim 4, characterized in that, The outer peripheral surface of the first end (41) is a cylindrical surface or a conical surface; And / or, the outer peripheral surface of the second end (42) is a cylindrical surface or a conical surface.

6. The hydraulic end according to claim 2, 4, or 5, characterized in that, The hydraulic end also includes a sealing ring (51), which is sealed between the end face of the packing box (31) and the bottom of the first settling tank (12).

7. The hydraulic end according to claim 3, characterized in that, The packing assembly (30) also includes a packing cap (33), which is sleeved on the outside of the plunger (20) and threaded to the central channel (311), and the packing cap (33) is pressed against the packing body (32).

8. The hydraulic end according to claim 3 or 7, characterized in that, The packing box (31) has a lubrication hole (313) on its side wall, and the lubrication hole (313) is connected to the central channel (311).

9. The hydraulic end according to claim 1, characterized in that, The valve box (10) is also provided with a suction channel (15) that is coaxially arranged and connected with the plunger channel (11), and a second sink (16) is provided at the port of the suction channel (15). The hydraulic end also includes a valve box cap (61), a suction cap (62), and a suction cover (63). The suction cover (63) includes a blocking part (631) and a pressing part (632). The blocking part (631) is located in the suction channel (15), the pressing part (632) is located in the second settling tank (16), the suction cap (62) is located on the valve box cap (61) and abuts against the pressing part (632), and the valve box cap (61) is detachably connected to the valve box (10).

10. The hydraulic end according to claim 9, characterized in that, The valve box (10) has a plurality of third mounting holes (17) on the outer periphery of the second settling tank (16). The valve box cap (61) is provided with a central hole and a plurality of fourth mounting holes. The plurality of fourth mounting holes are distributed around the central hole along the circumference of the valve box cap (61) and are provided in a one-to-one correspondence with the plurality of third mounting holes (17). The suction cap (62) is threaded into the center hole; The hydraulic end also includes a plurality of second fasteners, each of which is installed into the corresponding third mounting hole (17) and the fourth mounting hole.

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