Hydraulic end and fracturing pump

Abstract

This application discloses a hydraulic terminal and a fracturing pump, relating to the field of oil and gas equipment. A hydraulic terminal includes: a valve box, a plunger, a packing box, and a packing body; the valve box has a first channel; a first mounting groove is provided around the port of the first channel; the packing box has a mounting protrusion located in the first mounting groove, and the outer peripheral surface of the mounting protrusion is interference-fitted with the inner wall of the first mounting groove; the packing box has a second channel communicating with the first channel; the plunger is movably disposed in the first channel and the second channel; the packing body is sealingly connected between the outer wall of the plunger and the inner wall of the second channel. This application can solve problems such as sealing failure between the valve box and the packing box.

Description

Technical Field

[0001] This application belongs to the technical field of oil and gas equipment, specifically relating to a hydraulic end and fracturing pump. Background Technology

[0002] In the development of oil and gas fields, fracturing is the main method for reservoir stimulation and production enhancement. The construction process is mainly achieved through fracturing pump equipment, which injects high-pressure, high-volume fracturing fluid into the oil and gas reservoir to break up the formation, squeeze proppant into the fractures, form artificial fractures and diversion channels, and improve oil and gas recovery rate.

[0003] As a crucial component of fracturing equipment and fracturing plunger pumps, the hydraulic end pumps high-pressure proppant-carrying media during fracturing operations. In some related technologies, the packing box is directly fixed to the side of the valve box, allowing a seal to be achieved between the packing box and the valve box through the mutual compression between the planes.

[0004] As the operating pressure of fracturing equipment increases, excessive pressure can easily cause leakage between the packing box and the valve box. Over time, this can lead to large-scale leakage and seal failure. Utility Model Content

[0005] The purpose of this application is to provide a hydraulic end and fracturing pump that can solve problems such as sealing failure between the valve box and the packing box.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application provides a hydraulic terminal, including: a valve box, a plunger, a packing box, and a packing body;

[0008] The valve box is provided with a first channel;

[0009] The first channel has a first mounting groove around its port. Along the extension direction of the first channel, the end face of the first channel protrudes from the bottom of the first mounting groove. The packing box has a mounting protrusion and a second stepped surface. The mounting protrusion is arranged around the outer periphery of the second stepped surface. Along the extension direction of the first channel, the end face of the mounting protrusion protrudes from the second stepped surface. The mounting protrusion is located in the first mounting groove, and the outer peripheral surface of the mounting protrusion is interference-fitted with the inner wall of the first mounting groove.

[0010] The packing box is provided with a second channel communicating with the first channel. The plunger is movably disposed in the first channel and the second channel. The packing body is sealed between the outer wall of the plunger and the inner wall of the second channel.

[0011] This application also provides a fracturing pump, including the hydraulic end described above.

[0012] In this embodiment, the packing box and the valve box are two independent structures that can be assembled together to facilitate the installation and sealing of the plunger, ensuring smooth reciprocating movement of the plunger. Furthermore, the packing box has a mounting protrusion, and the valve box has a first mounting groove. The mounting protrusion is located in the first mounting groove, and its outer peripheral surface is press-fitted with the inner wall of the first mounting groove. This improves both the robustness and stability of the installation between the packing box and the valve box, and also enhances the sealing performance between them. Compared to the planar-to-planar compression sealing method used in related technologies, this embodiment employs a press-fit sealing method where the outer peripheral surface of the mounting protrusion is press-fitted with the inner wall of the first mounting groove. This significantly increases the sealing area, thereby increasing the ability to withstand greater leakage pressure and further reducing the risk of seal failure between the packing box and the valve box. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the first type of hydraulic end disclosed in the embodiments of this application;

[0014] Figure 2 This is a cross-sectional view of the valve box of the first type disclosed in the embodiments of this application;

[0015] Figure 3 This is a cross-sectional view of the first type of packing box disclosed in the embodiments of this application;

[0016] Figure 4 This is a cross-sectional view of the second form of the hydraulic end disclosed in the embodiments of this application;

[0017] Figure 5 This is a cross-sectional view of the second type of valve box disclosed in the embodiments of this application;

[0018] Figure 6 This is a cross-sectional view of the pedestal body disclosed in the embodiments of this application;

[0019] Figure 7 This is a schematic diagram of the first structure of the hydraulic end disclosed in an embodiment of this application;

[0020] Figure 8 This is a schematic diagram of the second structure of the hydraulic end disclosed in the embodiments of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10-Valve box; 11-First channel; 12-First mounting slot;

[0023] 20-Plunger;

[0024] 30 - Packing box; 31 - Mounting protrusion; 32 - Second channel; 33 - Annular groove; 34 - Second mounting groove; 35 - First stepped surface; 36 - Second stepped surface;

[0025] 40 - Packing root body; 41 - Packing root nested unit;

[0026] 50-packing cap;

[0027] 60 - Seals;

[0028] 70-Fasteners. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples and application scenarios.

[0032] refer to Figures 1 to 8 This application discloses a hydraulic end, which includes a valve box 10, a plunger 20, a packing box 30, and a packing body 40.

[0033] Valve box 10 is a basic component that can provide support and installation foundation for components such as plunger 20 and packing box 30; packing box 30 is used to install packing body 40, and packing body 40 is used to seal plunger 20.

[0034] The valve box 10 may have a first channel 11, and a first mounting groove 12 may be provided around the port of the first channel 11. Along the extension direction of the first channel 11, the end face of the first channel 11 protrudes beyond the bottom of the first mounting groove 12. Correspondingly, the packing box 30 may have a mounting protrusion 31 and a second stepped surface 36. The mounting protrusion 31 is arranged around the outer periphery of the second stepped surface 36. Along the extension direction of the first channel 11, the end face of the mounting protrusion 31 protrudes beyond the second stepped surface 36. The mounting protrusion 31 is located in the first mounting groove 12, and the outer peripheral surface of the mounting protrusion 31 is press-fitted with the inner wall of the first mounting groove 12. Based on this configuration, a stable connection between the packing box 30 and the valve box 10 can be achieved through the cooperation of the mounting protrusion 31 and the first mounting groove 12.

[0035] The packing box 30 may be provided with a second channel 32, which is connected to the first channel 11 provided in the valve box 10. The plunger 20 is movably disposed in the first channel 11 and the second channel 32 so as to pressurize the fracturing fluid through the reciprocating movement of the plunger 20.

[0036] The substrate 40 is sealed between the outer wall of the plunger 20 and the inner wall of the second channel 32 to achieve a seal between the plunger 20 and the second channel 32, thereby preventing the fracturing fluid from leaking from the gap between the plunger 20 and the second channel 32.

[0037] In this embodiment, the packing box 30 and the valve box 10 are two independent structures that can be assembled together to facilitate the installation and sealing of the plunger 20, ensuring that the plunger 20 can move smoothly back and forth. Furthermore, the packing box 30 is provided with a mounting protrusion 31, and the valve box 10 is provided with a first mounting groove 12. The mounting protrusion 31 is located in the first mounting groove 12, and the outer peripheral surface of the mounting protrusion 31 is interference-fitted with the inner wall of the first mounting groove 12. In this way, the firmness and stability of the installation between the packing box 30 and the valve box 10 can be improved, as well as the sealing performance between the packing box 30 and the valve box 10 can be improved.

[0038] Compared to the sealing method achieved by plane-to-plane compression between the packing box 30 and the valve box 10 in related technologies, the embodiment of this application adopts a sealing method by interference fit between the outer peripheral surface of the mounting protrusion 31 and the inner wall of the first mounting groove 12, which can greatly increase the sealing area, thereby improving the ability to withstand greater leakage pressure and further reducing the risk of seal failure between the packing box 30 and the valve box 10.

[0039] refer to Figures 1 to 3In some embodiments, the inner wall of the first mounting groove 12 can be an inner conical surface, and correspondingly, the outer wall of the mounting protrusion 31 can be an outer conical surface. In this way, through the interference fit between the inner and outer conical surfaces, the mounting protrusion 31 and the first mounting groove 12 can be assembled more tightly, which can improve the stability of the connection between the mounting protrusion 31 and the first mounting groove 12, and also help to improve the sealing performance between the mounting protrusion 31 and the first mounting groove 12.

[0040] Optionally, the inner conical surface can be a conical surface, a pyramidal surface, etc.; the outer conical surface can be a conical surface, a pyramidal surface, etc.

[0041] In other embodiments, the inner wall of the first mounting groove 12 can be an inner cylindrical surface, and the outer wall of the mounting protrusion 31 can be an outer cylindrical surface. In this way, the stability and sealing of the connection between the mounting protrusion 31 and the first mounting groove 12 can be ensured through the interference fit between the inner cylindrical surface and the outer cylindrical surface.

[0042] Optionally, the inner cylindrical surface can be a cylindrical surface, a prism surface, etc.; the outer cylindrical surface can be a cylindrical surface, a prism surface, etc.

[0043] In some embodiments, the packing box 30 can be a metal packing box to increase its load-bearing capacity, thereby facilitating an increase in the operating pressure at the hydraulic end. The valve box 10 can be a metal valve box to increase its load-bearing capacity, thereby facilitating an increase in the operating pressure at the hydraulic end.

[0044] refer to Figure 1 and Figure 4 In some embodiments, the hydraulic end may also include a packing cap 50, which is fitted onto the outside of the plunger 20 to avoid obstructing the plunger 20.

[0045] In addition, the outer wall of the packing gland cap 50 is threaded to the inner wall of the second channel 32, and the end of the packing gland cap 50 abuts against the packing body 40. Based on this, the packing gland cap 50 can axially limit the packing body 40 to prevent the packing body 40 from moving axially and detaching from the packing box 30 under the action of the plunger 20.

[0046] Furthermore, the packing cap 50 may be provided with a third channel, and the plunger 20 is movably inserted into the third channel.

[0047] refer to Figure 3 and Figure 4In some embodiments, the inner wall of the second channel 32 may be provided with an annular groove 33. When the plunger 20 passes through the second channel 32, an accommodating space can be formed between the outer wall of the plunger 20 and the annular groove 33. The packing body 40 can be disposed in the annular groove 33, that is, the packing body 40 is located in the accommodating space. In this way, the installation of the packing body 40 between the plunger 20 and the packing box 30 can be guaranteed, and the packing body 40 can also play a sealing role.

[0048] Furthermore, the inner wall of the second channel 32 may also be provided with a second mounting groove 34. The depth of the second mounting groove 34 in the radial direction of the packing box 30 is greater than the depth of the annular groove 33, and at least a portion of the packing cap 50 is disposed in the second mounting groove 34. Based on this arrangement, a stepped structure can be formed at the joint between the annular groove 33 and the second mounting groove 34. The stepped structure can limit the end of the packing cap 50 to prevent the packing cap 50 from excessively compressing the packing body 40, thereby affecting the sealing effect and service life of the packing body 40.

[0049] Optionally, a sealing ring may be provided between the end face of the packing cap 50 and the stepped structure to improve the axial sealing performance between the packing cap 50 and the packing box 30.

[0050] refer to Figure 1 and Figure 4 In some embodiments, a sealing element 60 may be provided between the inner wall of the packing cap 50 and the outer wall of the plunger 20. The sealing element 60 can seal the gap between the packing cap 50 and the plunger 20 to prevent fracturing fluid from leaking between the packing cap 50 and the plunger 20.

[0051] Optionally, the inner wall of the third channel of the packing cap 50 may be provided with an annular groove, at least a portion of the seal 60 may be embedded in the annular groove, and the portion of the seal 60 protruding from the annular groove abuts against the outer wall of the plunger 20 to achieve a sealing effect.

[0052] refer to Figure 3 In some embodiments, the packing box 30 may have a first stepped surface 35, which is arranged around the outer region of the mounting protrusion 31 and abuts against the side of the valve box 10. Based on this arrangement, the abutting fit between the first stepped surface 35 and the side of the valve box 10 can form a secondary seal between the mating mounting protrusion 31 and the outer side of the first mounting groove 12, thereby further improving the tightness of the installation between the packing box 30 and the valve box 10, and thus improving the sealing performance.

[0053] Optionally, a sealing gasket may be provided between the first step surface 35 and the side of the valve box 10 to further achieve sealing.

[0054] refer to Figure 4 In other embodiments, the second stepped surface 36 abuts against the side of the valve box 10. Based on this arrangement, the abutment between the second stepped surface 36 and the side of the valve box 10 can form a secondary seal between the mating mounting protrusion 31 and the inner side of the first mounting groove 12, thereby further improving the tightness of the installation between the packing box 30 and the valve box 10, and thus improving the sealing performance.

[0055] Optionally, a sealing gasket may be provided between the second step surface 36 and the side of the valve box 10 to further achieve sealing.

[0056] refer to Figure 1 and Figure 4 In some embodiments, both the packing box 30 and the valve box 10 may have mounting through holes on their sides; furthermore, the hydraulic end may include a fastener 70, which passes through the mounting through holes of the packing box 30 and the valve box 10. Based on this, the fastening action of the fastener 70 can effectively prevent the packing box 30 from moving relative to or even detaching from the valve box 10, thereby ensuring the installation stability of the packing box 30.

[0057] Optionally, the mounting through hole on the side of the valve box 10 can be a threaded hole, the mounting through hole on the side of the packing box 30 can be a smooth hole, and the fastener 70 can be a fastening bolt, fastening screw, etc.

[0058] refer to Figure 6 In some embodiments, the packing body 40 may include a plurality of packing sleeve units 41, with adjacent packing sleeve units 41 being sealed together to ensure the sealing between adjacent packing sleeve units 41.

[0059] Optionally, in two adjacent packing sleeve units 41, one end is provided with a protrusion and the other end is provided with a recess. The cooperation between the protrusion and the recess can improve the relative stability between the two adjacent packing sleeve units 41 and increase the sealing area, thereby further improving the sealing performance.

[0060] Based on the aforementioned hydraulic end, this application also discloses a plunger pump, which includes the aforementioned hydraulic end.

[0061] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A hydraulic end, characterized in that, include: Valve box (10), plunger (20), packing box (30) and packing body (40); The valve box (10) is provided with a first channel (11); The first channel (11) has a first mounting groove (12) around its port. Along the extension direction of the first channel (11), the end face of the first channel (11) protrudes from the bottom of the first mounting groove (12). The packing box (30) has a mounting protrusion (31) and a second step surface (36). The mounting protrusion (31) is arranged around the outer periphery of the second step surface (36). Along the extension direction of the first channel (11), the end face of the mounting protrusion (31) protrudes from the second step surface (36). The mounting protrusion (31) is located in the first mounting groove (12), and the outer periphery of the mounting protrusion (31) is press-fitted with the inner wall of the first mounting groove (12). The packing box (30) is provided with a second channel (32) communicating with the first channel (11). The plunger (20) is movably disposed in the first channel (11) and the second channel (32). The packing body (40) is sealed between the outer wall of the plunger (20) and the inner wall of the second channel (32).

2. The fluid end of claim 1, wherein, The inner wall of the first mounting groove (12) is an inner conical surface or an inner cylindrical surface, and the outer wall of the mounting protrusion (31) is an outer conical surface or an outer cylindrical surface; And / or, the packing box (30) is a metal packing box, and the valve box (10) is a metal valve box.

3. The fluid end of claim 1, wherein, The hydraulic end also includes a packing cap (50), which is sleeved on the outside of the plunger (20). The outer wall of the packing cap (50) is threaded to the inner wall of the second channel (32), and the end of the packing cap (50) abuts against the packing body (40).

4. The fluid end of claim 3, wherein, The inner wall of the second channel (32) is provided with an annular groove (33), and the disk body (40) is disposed in the annular groove (33). The inner wall of the second channel (32) is also provided with a second mounting groove (34), the depth of the second mounting groove (34) in the radial direction of the packing box (30) is greater than the depth of the annular groove (33), and at least part of the packing cap (50) is provided in the second mounting groove (34).

5. The fluid end of claims 3 or 4, wherein, A sealing element (60) is provided between the inner wall of the packing cap (50) and the outer wall of the plunger (20).

6. The fluid end of claim 1, wherein, The packing box (30) is provided with a first stepped surface (35), which is arranged around the outer area of ​​the mounting protrusion (31) and abuts against the side of the valve box (10).

7. The fluid end of claim 1, wherein, The second step surface (36) abuts against the end face of the valve box (10).

8. The fluid end of claims 6 or 7, wherein, Both the packing box (30) and the valve box (10) have mounting through holes on their sides; The hydraulic end also includes a fastener (70) which passes through the mounting holes of the packing box (30) and the valve box (10).

9. The fluid end of claim 1, wherein, The packing body (40) includes multiple packing sleeve units (41), with adjacent packing sleeve units (41) being sealed together.

10. A fracturing pump characterized by, A fluid end comprising any one of claims 1 to 9.

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