Novel anti-corrosion oil well pump fixing valve and oil well pump

Abstract

The utility model discloses a novel anti-corrosion oil well pump standing valve and an oil well pump. The standing valve comprises a valve body, a valve seat is fixedly arranged in the valve body, a valve ball is arranged on the valve seat, a valve cover covering the valve ball is arranged above the valve ball, and an anti-collision lining is arranged on the inner wall of the valve cover. The valve further comprises a lower connecting piece which is fixedly connected with the lower end of the valve body, and the lower connecting piece enables the valve seat not to be affected by external force. The anti-collision lining is additionally arranged in the inner cavity of the valve cover, the valve ball does not make direct contact with the circumferential direction, the radial direction and the top of the valve cover in the oil extraction process, and therefore the phenomenon that the whole inner cavity of the valve cover is abraded is reduced; and the lower connecting piece is additionally arranged to play a role in protecting the valve seat, so that the valve seat is not influenced by external force factors.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield oil production equipment, and specifically relates to a new type of anti-corrosion fixed valve of a sucker rod pump and a sucker rod pump. Background Art

[0002] At present, in the mechanical oil production of oilfields, the fixed valve of the sucker rod pump is a component that significantly affects the pump efficiency and service life of the sucker rod pump, and plays a crucial role in extending the trouble-free period of oil wells.

[0003] The existing fixed valve of the sucker rod pump is restricted by the diameter of the pump barrel or the inner diameter of the tubing outside the valve cover. Inside, a valve ball seat also needs to be installed, resulting in a small space. This causes the rigid wall of the valve cover to be thin. Moreover, the valve cover always bears alternating loads and is frequently impacted by the valve ball during operation. Therefore, as the working time extends, under the repeated action of the alternating loads, the thin-walled part is stretched and impacted and becomes thinner and thinner, eventually causing the valve cover to suddenly break at the thin-walled part and resulting in the shutdown of the oil well. At the same time, during the oil production process, the impact force of the valve ball on the inner cavity of the valve cover each time it opens and the impact force on the ball seat when it falls back are much greater than before. In this way, after the inner cavity of the valve cover is impacted in the entire circumferential, longitudinal, and top directions, serious wear and deformation will occur, causing the movement stroke trajectory (not up and down movement) of the valve ball to change during the opening and falling-back processes, and the falling-back to be erratic, resulting in uneven circumferential force on the sealing end face of the ball seat, and thus causing the ball seat to break and the deep well pump to fail prematurely.

[0004] Publication No.: CN212536045U discloses a sucker rod pump and its fixed valve assembly, including a coupling and a fixed valve cover. The coupling has a coupling channel that penetrates in the up and down directions, and an internal thread is provided at the upper end of the coupling, which is screwed with the external thread section provided at the lower end of the pump barrel, so that the pump barrel extends into the upper internal space of the coupling. And a fixed valve seat and a fixed valve ball are arranged inside the fixed valve cover. A lower joint that tightly presses the fixed valve seat upward is screwed at the bottom of the fixed valve cover. An external thread section is provided at the top of the fixed valve cover, and it extends into the lower space inside the coupling and is screwed with the coupling.

[0005] The valve cover of this prior art does not have protection measures and will deform during the oil production process. Moreover, the ball seat is in direct contact with the lower joint and will be affected by the pipe string stress, reducing the service life of the fixed valve.

[0006] Publication No.: CN209743138U discloses an anti-breaking and anti-disconnection device for the plunger of a sucker rod pump, including a valve ball. The valve ball and the ball seat are installed in the valve body. The valve body is connected to the liquid outlet joint. A partition is installed between the valve ball and the liquid outlet joint, and liquid flow holes are provided in both the partition and the liquid outlet joint. The partition blocks the valve ball in the valve body below the liquid outlet joint, ensuring that the liquid outlet joint provided with the liquid flow holes is not impacted.

[0007] During the oil production process, the partition plate of this prior art will deform, affecting the movement route of the valve ball, causing uneven force on the valve seat, and reducing the service life of the fixed valve.

[0008] Publication number: CN203822613U, which discloses a closed valve cover upward displacement oil pump, including a pump barrel and a plunger disposed inside and cooperating with it. The lower end of the plunger is connected to a first plunger closed valve cover, the upper end of the plunger is connected to a second plunger closed valve cover through a plunger joint, and the upper end of the second plunger closed valve cover is connected to a plunger open valve cover; a valve seat and a valve ball are respectively disposed inside the first plunger closed valve cover and the second plunger closed valve cover.

[0009] In this prior art, the ball seat is in direct contact with the lower joint, and the ball seat will be affected by the pipe string stress, reducing the service life of the fixed valve.

[0010] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects of the above disclosed technologies are all different from those of the present utility model. For more technical features, technical problems to be solved, and beneficial effects of the present utility model, there is no technical inspiration in the above disclosed technical documents. Summary of the Utility Model

[0011] Aiming at the above defects existing in the prior art, the purpose of the present utility model is to provide a new type of anti-corrosion fixed valve for an oil pump and an oil pump.

[0012] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0013] On the one hand, the present utility model provides a new type of anti-corrosion fixed valve for an oil pump, including a valve body. A valve seat is fixedly arranged inside the valve body, a valve ball is seated on the valve seat, a valve cover covering the valve ball is arranged above the valve ball, and an anti-collision lining is arranged on the inner wall of the valve cover; it also includes a lower connecting piece, which is fixedly connected to the lower end of the valve body, and the lower connecting piece makes the valve seat not affected by external forces.

[0014] Furthermore, it also includes an upper connecting piece, which is fixedly connected to the upper end of the valve body, and the upper connecting piece makes the valve cover not affected by external forces.

[0015] Furthermore, a circular convex ring is arranged inside the valve body;

[0016] Specifically, the valve seat is placed below the circular convex ring, and a ball seat pressing joint is connected to the lower end of the inner wall of the valve body. The ball seat pressing joint presses the valve seat against the lower end face of the circular convex ring;

[0017] Specifically, the valve cover is placed above the circular convex ring, and a compression cap is connected to the upper end of the inner wall of the valve body. The compression cap presses the valve cover against the upper end face of the circular convex ring;

[0018] Specifically, when the valve ball sits on the valve seat, the valve ball does not contact the circular convex ring.

[0019] Further, the compression cap is a stepped cylindrical structure with a thinner lower part and a thicker upper part. The compression cap is provided with a central hole. The outer wall of the thinner lower diameter of the compression cap is connected to the inner wall of the upper end of the valve body. An opening is provided at the top of the compression cap.

[0020] Further, the anti-collision lining is a cobalt alloy lining;

[0021] Specifically, at least three through holes are evenly distributed on the side wall of the valve cover, and a flow-through hole is provided at the upper end of the valve cover.

[0022] Further, the through holes on the side wall of the valve cover are square or oval;

[0023] Specifically, at least two flow-through holes are evenly distributed at the upper end of the valve cover. The flow-through holes are circular or oval or two "crescent-shaped" flow-through holes are formed by arranging a cross bar at the upper end of the valve cover.

[0024] Further, a square end is provided at the lower end of the ball seat compression joint for the clamping of a tool for installation.

[0025] Further, the upper connecting member is a coupling. The inner wall of the lower end of the coupling is connected to the outer wall of the upper end of the valve body. An upper connecting thread is provided at the upper end of the upper connecting member;

[0026] Specifically, the lower connecting member is a protective sleeve. The inner wall of the upper end of the protective sleeve is connected to the outer wall of the lower end of the valve body. A lower connecting thread is provided at the lower end of the protective sleeve.

[0027] On the other hand, the present utility model provides a new type of anti-corrosion oil extraction pump, including a pump barrel and a piston. The piston is arranged in the pump barrel. It is characterized in that the fixed valve of the pump barrel is a new type of anti-corrosion oil extraction pump fixed valve as described above; the lower end of the pump barrel is connected to the upper connecting member, and a convex block corresponding to the opening at the upper end of the compression cap is provided on the lower end surface of the piston.

[0028] Further, the opening at the upper end of the compression cap is a "one"-shaped opening, and the convex block on the lower end surface of the piston is a "one"-shaped convex block.

[0029] The present utility model has the following beneficial effects compared with the prior art:

[0030] 1. A highly wear-resistant and high-strength anti-corrosion alloy anti-collision lining is installed in the inner cavity of the valve cover of the present utility model. During the oil extraction process, the valve ball does not directly contact the valve cover in the circumferential, radial, and top directions, thereby reducing the occurrence of wear in the entire inner cavity of the valve cover.

[0031] 2. The utility model is equipped with a protective sleeve, which plays a role in protecting the compression joint and the valve seat, so that the compression joint under the valve seat is not affected by external force factors.

[0032] 3. The pressing cap of the utility model is provided with a "one"-shaped opening. First, it is convenient to tighten on the valve cover body to prevent the valve cover from loosening. Second, after the sucker rod is lowered, it is necessary to rotate the sucker rod string to complete the docking or disconnection of the disconnecting sub, and it is convenient for the convex block under the piston to be stuck into the groove to prevent the piston from rotating together with the sucker rod string. Brief Description of the Drawings

[0033] Figure 1 It is a schematic structural view of a new type of anti-corrosion fixed valve of a sucker rod pump of the utility model;

[0034] Figure 2 It is a schematic structural view of the pressing cap in the utility model;

[0035] Figure 3 It is a schematic structural view of the valve cover in the utility model;

[0036] Figure 4 It is a schematic structural view of the ball seat compression joint in the utility model.

[0037] In the figure: 1. Pump barrel; 2. Collar; 3. Pressing cap; 3-0. Central hole; 3-1. Opening; 4. Valve cover; 4-0. Cross bar; 4-1. Flow hole; 4-2. Through hole; 5. Valve ball; 6. Valve seat; 7. Valve body; 8. Ball seat compression joint; 8-0. Square end; 9. Protective sleeve. Detailed Embodiment

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0039] Embodiment 1:

[0040] Please refer to Figures 1 to 4 , a new type of anti-corrosion fixed valve of a sucker rod pump provided by the present utility model includes a valve body 7, a valve seat 6 is fixedly arranged in the valve body 7, a valve ball 5 is seated on the valve seat 6, a valve cover 4 covering the valve ball 5 is arranged above the valve ball 5, the upper end of the inner wall of the valve body 7 is connected with a pressing cap 3, the pressing cap 3 fixes the valve cover 4, and an opening 3-1 is arranged at the upper end of the pressing cap 3 for locking the piston.

[0041] The outer wall of the upper end of the valve body 7 is threadedly connected with a coupling 2. The upper end of the coupling 2 is threadedly connected with a pump barrel 1. The outer wall of the lower end of the valve body 7 is threadedly connected with a protective sleeve 9. The upper end of the pump barrel 1 is threadedly connected with an oil pipe.

[0042] Among them, the valve body 7 is a circular tube body, and external threads are provided at both ends. A circular convex ring is arranged inside the valve body 7. The valve seat 6 is placed below the circular convex ring. The inner wall of the lower end of the valve body 7 is threadedly connected with a ball seat compression joint 8. The ball seat compression joint 8 presses the valve seat 6 against the lower end face of the circular convex ring. The valve cover 4 is placed above the circular convex ring. The compression cap 3 presses the valve cover 4 against the upper end face of the circular convex ring. When the valve ball 5 sits on the valve seat 6, the valve ball 5 does not contact the circular convex ring.

[0043] Among them, the coupling 2 is a circular tube body. A limiting convex ring is arranged on the inner wall of the coupling 2. Internal threads for connecting with the pump barrel 1 are provided above the limiting convex ring. Internal threads for connecting with the valve body 7 are provided below the limiting convex ring. The inner diameter of the inner wall below the limiting convex ring is larger than the inner diameter of the inner wall above the limiting convex ring.

[0044] Among them, the compression cap 3 is a stepped cylinder structure with a thinner lower part and a thicker upper part. The compression cap 3 is provided with a central hole 3-0. External threads for connecting with the valve body 7 are provided on the thinner lower diameter part of the compression cap 3. A "-" shaped opening 3-1 is provided at the top of the compression cap 3. A "-" shaped convex block corresponding to the "-" shaped opening 3-1 is provided below the piston. Specifically, the opening 3-1 radially penetrates the compression cap 3. Two convex blocks are provided. The two convex blocks are respectively docked with the openings 3-1 on both sides of the central hole 3-0.

[0045] An opening 3-1 is provided in the upper part of the compression cap 3. One is to facilitate screwing the compression cap 3 tightly on the valve body 7 to press the valve cover 4 and prevent the valve cover 4 from loosening. The other is that when docking or disconnecting the disconnecting joint after the sucker rod is lowered, the sucker rod string needs to be rotated. In this way, when lowering the sucker rod, the two convex blocks below the piston are temporarily stuck in the opening 3-1 to prevent the piston from rotating together with the sucker rod string. Thus, rotating the sucker rod string can complete the docking or disconnection.

[0046] It should be noted that the piston itself is a prior art. The present utility model only adds a "-" shaped convex block to the lower end face of the existing piston. The structure inside the piston is clear to those skilled in the art.

[0047] Among them, the valve cover 4 is a circular tube body. At least three through holes 4-2 are evenly distributed on the side wall of the valve cover 4. The material of the valve cover 4 adopts an anti-corrosion material and is subjected to heat treatment processes such as quenching, overall quenching, and surface carburizing, so that its comprehensive properties such as strength, hardness, and wear resistance are further improved. A porous high-wear-resistant and high-strength anti-corrosion cobalt alloy lining is installed on the inner wall of the valve cover 4. During the oil production process, the valve ball 5 does not directly contact the circumferential, radial, and top parts of the valve cover 4, thereby reducing the occurrence of wear phenomena in the entire inner cavity of the valve cover 4.

[0048] In this embodiment, a cross bar 4-0 is provided at the upper end of the valve cage 4, and the cross bar 4-0 divides the upper port of the valve cage 4 into two "crescent-shaped" flow holes 4-1.

[0049] Wherein, the valve seat 6 is in interference fit with the inner wall of the valve body 7. The outer diameter of the ball seat compression joint 8 is larger than the outer diameter of the valve seat 6, which facilitates the valve seat 6 to pass through the internal thread section at the lower end of the valve body 7 during installation and be in interference fit with the inner wall of the valve body 7. The valve seat 6 is further fixed by connecting the ball seat compression joint 8 with the internal thread section at the lower end of the valve body 7.

[0050] Wherein, the ball seat compression joint 8 is a circular tube body. An external thread for connecting with the inner wall at the lower end of the valve body 7 is provided at the upper end of the ball seat compression joint 8, and a square end 8-0 is provided at the lower end of the ball seat compression joint 8 for the clamping of the installation tool.

[0051] Wherein, an internal thread for cooperating with the valve body 7 is provided at the upper part of the protective sleeve 9, and an external thread for connecting with the tail pipe is provided at the lower part.

[0052] Regarding the protection of the valve seat 6, it is mainly considered to prevent the ball seat compression joint 8 below the valve seat 6 from being affected by external force factors. The tail pipe is not directly connected to the ball seat compression joint 8 below the valve seat 6, but is connected to the valve body 7 through the protective sleeve 9, playing a role in protecting the ball seat compression joint 8 and the valve seat 6.

[0053] Embodiment 2:

[0054] On the basis of Embodiment 1, specifically, at least two uniformly distributed flow holes 4-1 are provided at the upper end of the valve cage 4, and the flow holes 4-1 are circular or elliptical.

[0055] Specifically, the valve cage 4 is made of stainless steel material.

[0056] Specifically, four through holes 4-2 are symmetrically arranged on the side wall of the valve cage 4.

[0057] Specifically, the through holes 4-2 on the side wall of the valve cage 4 are square or elliptical. Through the design of the elliptical flow hole, the flow area is further increased and the oil flow resistance is reduced.

[0058] Specifically, the square end 8-0 on the outer wall at the lower end of the ball seat compression joint 8 is a two-to-six-sided square end 8-0 for easy installation and removal.

[0059] Embodiment 3:

[0060] On the basis of Embodiment 1, this embodiment provides a use method of a new type of anti-corrosion oil production pump fixed valve, including the following steps:

[0061] S1. Connect a new type of anti-corrosion oil extraction pump fixed valve to the lower end of the tubing through the pump barrel 1, connect the tail pipe to the lower end of the protective sleeve 9, and lower it into the well;

[0062] S2. Lower the sucker rod. Under the limitation of the compression cap 3, the piston and the sucker rod can be easily butted;

[0063] S3. Conduct oil extraction operations. During the oil extraction process, the pipe string stress is transmitted through the valve body 7, and the valve seat 6 and the valve cover 4 are not affected by external forces, extending the service life of the fixed valve;

[0064] S4. When it is necessary to lift out the sucker rod, slowly rotate and lower the sucker rod to engage the piston with the opening 3-1 of the compression cap 3, and then the sucker rod can be removed.

[0065] In this application, all the components themselves that are not elaborated and the connection methods of the various components in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0066] In the present utility model, the term "a plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0067] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present utility model.

[0068] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0069] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A novel anti-corrosion oil pump fixed valve, comprising a valve body, a valve seat fixedly arranged in the valve body, a valve ball sitting on the valve seat, a valve cover covering the valve ball arranged above the valve ball, characterized in that: The inner wall of the valve cover is provided with an anti-collision lining; It also includes a lower connecting piece, which is fixedly connected to the lower end of the valve body, and the lower connecting piece prevents the valve seat from being affected by external forces.

2. The novel anti-corrosion oil pump fixed valve according to claim 1 is characterized in that: It also includes an upper connecting piece, which is fixedly connected to the upper end of the valve body, and the upper connecting piece prevents the valve cover from being affected by external forces.

3. The novel anti-corrosion oil pump fixed valve according to claim 2 is characterized in that: A circular convex ring is arranged in the valve body; The valve seat is placed below the circular convex ring, and a ball seat clamping joint is connected to the lower end of the inner wall of the valve body, and the ball seat clamping joint presses the valve seat against the lower end surface of the circular convex ring; The valve cover is placed above the circular convex ring, and a pressure cap is connected to the upper end of the inner wall of the valve body, and the pressure cap presses the valve cover tightly against the upper end surface of the circular convex ring; When the valve ball sits on the valve seat, the valve ball does not contact the circular convex ring.

4. The novel anti-corrosion oil pump fixed valve according to claim 3 is characterized in that: The pressure cap is a stepped cylindrical structure with a thin bottom and a thick top. The pressure cap is provided with a central hole. The lower thin-diameter outer wall of the pressure cap is connected to the inner wall of the upper end of the valve body. The top of the pressure cap is provided with an opening.

5. The novel anti-corrosion oil pump fixed valve according to claim 3 is characterized in that: The anti-collision lining is a cobalt alloy lining; The side wall of the valve cover is provided with at least three evenly distributed through holes, and the upper end of the valve cover is provided with a flow hole.

6. The novel anti-corrosion oil pump fixed valve according to claim 4 is characterized in that: The through hole on the side wall of the valve cover is square or oval; The upper end of the valve cover is provided with at least two evenly distributed flow holes, and the flow holes are circular or elliptical, or two "crescent-shaped" flow holes are formed by arranging a horizontal bar on the upper end of the valve cover.

7. The novel anti-corrosion oil pump fixed valve according to claim 3 is characterized in that: The lower end of the ball seat clamping joint is provided with a square end for supporting the installation tool.

8. A novel anti-corrosion oil well pump fixed valve according to any one of claims 2 to 7, characterized in that: The upper connecting piece is a coupling, the inner wall of the lower end of the coupling is connected to the outer wall of the upper end of the valve body, and the upper end of the upper connecting piece is provided with an upper connecting thread; The lower connecting piece is a protective sleeve, the inner wall of the upper end of the protective sleeve is connected to the outer wall of the lower end of the valve body, and the lower end of the protective sleeve is provided with a lower connecting thread.

9. A novel anti-corrosion oil pump, comprising a pump barrel and a piston, wherein the piston is arranged in the pump barrel, characterized in that: The fixed valve of the pump barrel is a novel anti-corrosion oil pump fixed valve as described in claim 4; The lower end of the pump barrel is connected to the upper connecting piece, and the lower end surface of the piston is provided with a convex block corresponding to the opening of the upper end of the pressure cap.

10. The novel anti-corrosion oil well pump according to claim 9 is characterized in that: The opening at the upper end of the pressure cap is an "I"-shaped opening, and the convex block on the lower end surface of the piston is an "I"-shaped convex block.

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