Impact-resistant oil well pump

Abstract

The application belongs to the technical field of oil exploitation, and particularly relates to an impact-resistant oil well pump. The impact-resistant oil well pump comprises a fixed valve cover, a fixed valve ball, a fixed valve seat, a pump cylinder and a plunger body. The fixed valve cover comprises a cylindrical body, a valve ball chamber, a limiting stop head, a guide righting rib and a valve seat. The limiting stop head is arranged in the valve ball chamber, and the guide righting rib is arranged below the limiting stop head. A homing inclined surface is arranged at the lower part of the valve ball chamber. When the valve ball is opened and closed, the impact force of the valve ball on the valve cover and the valve seat is small, the impact resistance is good, and the service life of the oil well pump is improved.

Description

Technical Field

[0001] This invention belongs to the field of petroleum extraction technology, specifically relating to an impact-resistant oil pump. Background Technology

[0002] With the continuous development of oil fields and the increasing number of deep pumping wells, the operating conditions of deep pumping wells are harsh. The pump hangs deep, the temperature is high, and the components of the pumping pump are affected by corrosion and alternating loads, which greatly reduces the service life of the pumping pump and seriously restricts the development benefits of the oil field.

[0003] The algorithm currently used for oil pump valves is as follows:

[0004] h = 0.5(D Q sinα-acosα)-0.4sin30°+D Q

[0005] D Q — Valve ball diameter;

[0006] α — the semi-cone angle of the sealing cone;

[0007] a——Valve ball, valve seat grinding and width.

[0008] This algorithm is currently the main algorithm for designing the height of oilfield pneumatic chambers.

[0009] Currently, the materials used in oil pump valves are not sufficiently corrosion-resistant and impact-resistant: the valve ball of the valve assembly is 9Cr18Mo, the valve seat is 6Cr18Mo, and the valve cover, connectors and other components are made of 35CrMo. These materials can work for a long time in low water-cut oil wells, but cannot meet the requirements for long-life lifting in deep oil wells.

[0010] Patent application CN103821704A discloses a corrosion-resistant, sand-resistant, and wear-resistant oil pump, including a pump barrel. An upper pump barrel coupling is threaded to the upper end of the pump barrel, and a fixed one-way valve is threaded to the lower end. Inside the pump barrel is a plunger body with its axis aligned with the pump barrel's axis. Upward and downward one-way valves are connected to the upper and lower ends of the plunger body, respectively. The fixed one-way valve includes a fixed valve seat connector, which is threaded to a sand-proof pipe. A sealing plug is threaded to the lower end of the sand-proof pipe. Oil inlet holes are evenly distributed on the pipe wall of the sand-proof pipe. A sand-blocking sleeve is fitted over the sand-proof pipe, and the sleeve wall has staggered strip-shaped sand-blocking holes, the width of which is smaller than the inner diameter of the oil inlet holes on the sand-proof pipe wall. This oil pump uses a tail-end sand-blocking method to reduce the sand content in the fluid inside the pump barrel, thereby reducing wear.

[0011] Utility model patent CN208918802U discloses a corrosion-resistant and wear-resistant oil pump, including a sucker rod coupling, a sucker rod, a reducing coupling, an upper outer tube, an upper coupling, an upper short section, a first pump barrel coupling, a first outer tube coupling, an upper pump barrel, a lower outer tube, a second pump barrel coupling, a plunger assembly, a lower pump barrel, a second outer tube coupling, a first reducing joint, a hollow tube, an upper fixed valve assembly, a lower fixed valve assembly, and a second reducing joint. The sucker rod coupling is installed at one end of the sucker rod, and the sucker rod passes through the reducing coupling, the upper short section, the upper pump barrel, and the plunger assembly. The upper outer tube and the upper short section are connected by the upper coupling, and the upper outer tube is sleeved on one end of the reducing coupling. This oil pump uses a material lifting method to improve its corrosion resistance.

[0012] Utility model patent CN211058998U discloses a corrosion-resistant and wear-resistant oil pump, which includes a casing, an oil pipe, and a pump body. The oil pipe is placed inside the casing, with its upper end sealed by a circular plate fixing component and its lower end sealed by an inlet threaded groove, forming a sealed chamber. An overflow hole of the pump body is connected to the oil pipe, and the oil inlet end of the pump body is connected to the inlet threaded groove, which is connected to an external filter head. Magnesium, aluminum, or zinc metal anodes are provided inside the casing, on the oil pipe, on the pump body, and on the outer wall of the inlet threaded groove, and are fixed by locking clamps. By adding sacrificial anodes, the sacrificial anode corrosion protection function is achieved, effectively protecting the oil pipe, the pump body, and the inlet threaded groove, extending service life, slowing corrosion leakage, and thus extending the pump inspection cycle. The addition of magnesium, aluminum, or zinc metal anodes achieves the sacrificial anode corrosion protection function.

[0013] Utility model patent CN210769262U discloses a high-strength, corrosion-resistant deep well oil pump, which includes a pump barrel coupling, an outer pipe, an oil pipe coupling, a lower connector, a fixed valve, a reducing connector, and the fixed valve being fixedly connected from top to bottom in sequence; the lower end of the pump barrel is fixedly connected to the lower connector of the outer pipe assembly; a sealing ring is installed on the upper end shaft diameter of the pump barrel and is located in the inner hole of the pump barrel coupling in the middle of the outer pipe assembly, so that the annulus between the pump barrel and the outer pipe is sealed; the valve seat sealing surface of the traveling valve of the plunger assembly is arc-shaped; the two ends of the inner hole of the plunger are provided with connecting threads, and the middle inner hole and the threads at both ends are transitioned through a stepped hole with gradually increasing diameter.

[0014] Currently, conventional oil pump valves have poor impact resistance due to their structure and materials. Under high pressure differentials, valve assemblies and valve covers fracture or break due to impact fatigue, leading to pump failure. To address the problem of oil pump corrosion failure in these oil wells, oil pumps with excellent impact resistance and corrosion resistance are still needed. Summary of the Invention

[0015] The main objective of this invention is to provide an impact-resistant oil pump that has good impact resistance and corrosion resistance, long service life, and high pump efficiency, thus solving the problems existing in the aforementioned oil pumps.

[0016] To achieve the above objectives, the present invention adopts the following technical solution:

[0017] This invention provides an impact-resistant oil pump, comprising a fixed valve cover, a fixed valve ball, a fixed valve seat, a pump barrel, and a plunger body; the fixed valve cover includes a cylindrical body, a valve ball chamber, a limiting stop, a guide rib, and a valve seat; a limiting stop is provided in the valve ball chamber, and a guide rib is provided below the limiting stop; a return slope is provided at the lower part of the valve ball chamber.

[0018] Furthermore, the slope of the return ramp is 30°-50°. When the slope is less than 30°, the valve seat pressing surface becomes thinner, affecting the valve seat pressing effect. When the slope is greater than 50°, the height of the valve ball chamber increases, affecting the valve ball's return speed.

[0019] Furthermore, the distance between the top of the valve cover and the contact surface of the valve seat is:

[0020] h = 0.868(0.5(D) Q sinα-acosα)-0.4sin30°+D Q )

[0021] D Q — Valve ball diameter;

[0022] α — the semi-cone angle of the sealing cone;

[0023] a——Valve ball, valve seat grinding and width.

[0024] Furthermore, the arc of the guide rib is 26° to 32°. This distance minimizes the impact stress on both the valve cover and the valve seat. Within this angle range, the guide rib effectively straightens the valve ball, ensuring that the valve ball moves up and down along the guide rib during opening and closing. An angle less than 26° results in a slow descent of the valve ball, affecting pump efficiency, while an angle greater than 32° significantly increases fluid flow resistance when the valve ball opens.

[0025] Furthermore, the difference between the diameter of the guide rib and the diameter of the ball valve is 1mm-2mm.

[0026] Furthermore, the inner wall of the cylinder is threaded.

[0027] Furthermore, the thread processing method includes: thread rolling, with the rolling speed controlled at 1300–1600 r / min and the step speed controlled at 180–220 mm / min. The resulting thread has moderate strength, meeting fatigue requirements. Above 1600 r / min, the thread root is prone to breakage; below 1300 r / min, the thread crest is prone to wear, leading to incomplete threads. Regarding the step speed control, above 220 mm / min results in rough surface finish, while below 180 mm / min, the generated metal chips are difficult to remove, leading to thread processing failure.

[0028] Furthermore, the height of the limit stop is 4mm to 6mm. This height is sufficient to meet the impact of the valve ball during long-cycle opening. If it is less than 4mm, impact failure is likely to occur, and if it is greater than 6mm, it increases the cost.

[0029] Furthermore, the fixed valve cover is made of high-strength corrosion-resistant steel, the fixed valve ball is made of titanium carbide, and the valve seat is made of tungsten carbide.

[0030] Furthermore, the plunger body is located above the fixed valve cover, and the plunger body is provided with a traveling valve cover, a traveling valve ball, and a traveling valve seat.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The impact-resistant oil pump described in this invention exhibits relatively low impact forces between the valve ball and the valve cover and valve seat when the valve ball is opened and closed, thus demonstrating good impact resistance and contributing to improved pump lifespan.

[0033] The main components of the oil pump described in this invention are all made of corrosion-resistant materials and can withstand long-term fluid erosion. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the impact-resistant oil pump described in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the fixed valve cover according to an embodiment of the present invention;

[0036] Figure 3 for Figure 2 A cross-sectional view of the structure shown.

[0037] 1. Pump barrel; 2-1. Floating valve cover; 2-2. Floating valve ball; 2-3. Floating valve seat; 3. Piston body; 4-1. Fixed valve cover; 4-2. Fixed valve ball; 4-3. Fixed valve seat; A. Thread; C. Limiting collision surface; E. Returning inclined surface; F. Top tight cover; 410. Cylindrical body; 411. Valve ball chamber; 412. Limiting stop; 413. Guide straightening rib; 414. Valve seat; 414. Detailed Implementation

[0038] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0041] Example 1

[0042] like Figure 1 As shown, the shock-resistant oil pump includes a fixed valve cover 4-1, a fixed valve ball 4-2, a fixed valve seat 4-3, a pump barrel 1, and a plunger body 3.

[0043] The plunger body 3 is located above the fixed valve cover 4-1, and the plunger body is provided with a moving valve cover 2-1, a moving valve ball 2-2 and a moving valve seat 2-3.

[0044] like Figure 2 As shown, the fixed valve cover 4-1 includes a cylindrical body 410, a valve ball chamber 411, a limiting stop 412, a guide rib 413, and a valve seat 414. The limiting stop 412 is provided inside the valve ball chamber 411, and the guide rib 413 is provided below the limiting stop 412. A limiting collision slope C is provided at the upper part of the valve ball chamber 411, and a return slope E is provided at the lower part. The slope of the return slope E is 50°.

[0045] The distance from the top of the valve cover to the contact surface of the valve seat is:

[0046] h = 0.868(0.5(D) Q sinα-acosα)-0.4sin30°+D Q )

[0047] D Q — Valve ball diameter;

[0048] α — the semi-cone angle of the sealing cone;

[0049] a——Valve ball, valve seat grinding and width.

[0050] The arc β of the guide straightening rib 414 is 32°.

[0051] The difference between the diameter of the guide rib 414 and the diameter of the fixed ball valve is 2mm.

[0052] The inner wall of the cylindrical body 410 is provided with thread A. The thread processing method includes: thread processing by thread rolling, with the rolling speed controlled at 1600 r / min and the step controlled at 220 mm / min.

[0053] The height of the limit stop 413 is 6mm.

[0054] The fixed valve cover 4-1 is made of high-strength corrosion-resistant steel, the fixed valve ball 4-2 is made of titanium carbide, and the valve seat 415 is made of tungsten carbide.

[0055] The structure of the floating valve cover 2-1 is similar to that of the fixed valve cover 4-1, except that the size is different.

[0056] Example 2

[0057] The difference between the impact-resistant oil pump and Example 1 is that the slope of the return slope E is 30° and the arc β of the guide rib 414 is 26°.

[0058] The difference between the diameter of the guide rib 414 and the diameter of the fixed ball valve is 1mm.

[0059] The height of the limit stop 413 is 4mm. Everything else is the same as in Example 1.

[0060] The thread processing method includes: thread processing using the thread rolling method, with the rolling speed controlled at 1300 r / min and the step speed controlled at 180 mm / min.

[0061] Example 3

[0062] The difference between the impact-resistant oil pump and Example 1 is that the slope of the return slope E is 40° and the arc β of the guide rib 414 is 28°.

[0063] The difference between the diameter of the guide rib 414 and the diameter of the fixed ball valve is 1.5mm.

[0064] The height of the limit stop 413 is 5mm.

[0065] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An impact-resistant oil pump, comprising a fixed valve cover, a fixed valve ball, a fixed valve seat, a pump barrel, and a plunger body, characterized in that, The fixed valve cover includes a cylindrical body, a valve ball chamber, a limiting stop, a guide rib, and a valve seat; a limiting stop is provided in the valve ball chamber, and a guide rib is provided below the limiting stop; a limiting collision slope is provided at the upper part of the valve ball chamber, and a return slope is provided at the lower part; The slope of the return ramp is 30°-50°; The distance from the top of the valve cover to the contact surface of the valve seat is: h=0.868(0.5(D Q sinα-acosα)-0.4sin30°+D Q ) D Q — Valve ball diameter; α — the semi-cone angle of the sealing cone; a—Valve ball, valve seat grinding and width; The curvature of the guide straightening rib is 26° to 32°; The difference between the diameter of the guide rib and the diameter of the fixed ball valve is 1mm-2mm.

2. The impact-resistant oil pump according to claim 1, characterized in that, The inner wall of the cylinder is threaded.

3. The impact-resistant oil pump according to claim 2, characterized in that, The thread processing method includes: thread processing using the thread rolling method, with the rolling speed controlled at 1300-1600 r / min and the step speed controlled at 180-220 mm / min.

4. The impact-resistant oil pump according to claim 1, characterized in that, The height of the limit stop is 4mm to 6mm.

5. The impact-resistant oil pump according to claim 1, characterized in that, The fixed valve cover is made of high-strength corrosion-resistant steel, the fixed valve ball is made of titanium carbide, and the valve seat is made of tungsten carbide.

6. The impact-resistant oil pump according to claim 1, characterized in that, The plunger body is located above the fixed valve cover, and the plunger body contains a traveling valve cover, a traveling valve ball, and a traveling valve seat.

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