Suspension type strong on-off hollow air-proof feedback pump

Abstract

The utility model relates to an overhung strong on-off hollow gas-proof feedback pump and relates to the technical field of oil pumping pumps, comprising upper and lower pump cylinders arranged side by side from top to bottom, the upper and lower pump cylinders being connected through a sand-set gas-proof coupling, the inner diameter of the sand-set gas-proof coupling being greater than the inner diameters of the upper and lower pump cylinders, a flexible plunger assembly being arranged to reciprocate together between the upper and lower pump cylinders, the lower end of the flexible plunger assembly being connected to a forced mechanical valve group, the lower end of the lower pump cylinder being connected to a bottom pump cylinder, and the oil inlet of the forced mechanical valve group being fixedly connected to a plunger tube that is slidingly constrained in the bottom pump cylinder. The utility model solves the problems of the conventional oil pumping pump, i.e., the oil pumping pump is prone to gas locking during the up and down strokes, which results in a small oil output or even no oil output, seriously affecting the normal operation of the oil well, and the problems of the existing rod column, i.e., the friction between the thick oil and the oil pumping rod is large, the oil pumping rod is subjected to a large force, and the risk of the oil pumping rod being broken off is increased.

Description

Technical Field

[0001] This utility model relates to the field of oil pump technology, specifically to a suspended, high-opening, high-closing, hollow, anti-gas feedback pump. Background Technology

[0002] Conventional pumping units used in wells with high oil-to-gas ratios often suffer from poor oil filling, resulting in low pump efficiency and sometimes even "gas lock," rendering the pump inoperable and reducing well production. More seriously, pumping from such wells frequently causes "fluid level shock," accelerating damage to downhole equipment such as the sucker rod string, pump valves, and tubing. Simultaneously, the high sand content in the crude oil allows sand particles to easily enter between the plunger and pump barrel during pumping. This sand accelerates wear on both the plunger and barrel, potentially causing pump jamming, reducing pump lifespan, and ultimately lowering well production.

[0003] A prior art patent, CN218407760U, discloses a vertically arranged pump barrel. An outer tube is coaxially fitted around the outside of the pump barrel. Several oil inlet holes are arranged around the periphery of the outer tube near its upper end. A sand collection shell extends downwards from the lower end of the outer tube. Several sand guiding components are horizontally and parallelly fixed to the inner wall of the outer tube near its lower end, forming sand-falling channels through the area between adjacent sand guiding components. A backflow sand-blocking component is provided below each sand-falling channel. In conventional oil pumps, the presence of sand and gravel in the oil causes these materials to enter the pump along with the oil during oil extraction. Over time, this increases pump wear and affects extraction efficiency. Furthermore, air can enter the pump along with the oil, affecting its stable operation.

[0004] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects: First, existing oil pumps are prone to air lock during the up and down strokes, which can lead to low oil output or even no oil output, seriously affecting the normal operation of the oil well.

[0005] Secondly, during the up and down strokes of existing oil pumps, sand particles in the oil that are not carried to the ground tend to settle into the pump barrel, affecting the normal operation of the oil pump.

[0006] Third, during the downstroke, the existing rod column experiences high friction between the heavy oil and the sucker rod, resulting in significant stress on the sucker rod and increasing the risk of it breaking off.

[0007] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention solves the following problems: First, during the upstroke and downstroke, the oil pump is prone to airlock, leading to low or no oil production and severely impacting the normal operation of the oil well. Second, during the upstroke and downstroke, sand particles in the oil that haven't reached the surface tend to settle inside the pump barrel, affecting normal operation. Third, during the downstroke, the high friction between the heavy oil and the sucker rod increases the stress on the rod, raising the risk of rod breakage.

[0009] To solve the above problems, this utility model provides the following technical solution: A suspended, high-opening, hollow, gas-proof feedback pump includes an upper pump cylinder and a lower pump cylinder arranged side-by-side from top to bottom. The upper and lower pump cylinders are connected by a sand-absorbing gas-proof coupling, the inner diameter of which is larger than the inner diameters of both the upper and lower pump cylinders. A flexible plunger assembly is provided between the upper and lower pump cylinders, reciprocating and sliding together. A forced mechanical valve group is connected to the lower end of the flexible plunger assembly. The lower end of the lower pump cylinder is connected to the bottom pump cylinder, and the oil inlet of the forced mechanical valve assembly is fixedly connected to a plunger tube that is slidably constrained within the bottom pump cylinder.

[0010] As an optimized solution, the lower end of the lower pump cylinder is connected to the bottom pump cylinder via a bottom coupling.

[0011] As an optimized solution, the lower end of the lower pump cylinder is also connected to an extension coupling.

[0012] As an optimized solution, a sand-collecting pipe is coaxially fitted on the outside of the upper pump cylinder, and an annular sand-collecting cavity is formed between the inner wall of the sand-collecting pipe and the outer wall of the upper pump cylinder. A sand-blocking cover is fixedly connected to the upper end of the upper pump cylinder.

[0013] As an optimized solution, a support sleeve is fixedly connected between the outer wall of the upper pump cylinder near the upper end and the inner wall of the sand settling pipe. The support sleeve has several sand inlet channels along the circumference that connect the cavity above the sand baffle to the annular sand settling cavity.

[0014] As an optimized solution, during the upper stroke, the lower end of the flexible plunger assembly enters the sand-sinking and air-proof coupling; during the lower stroke, the upper end of the flexible plunger assembly enters the sand-sinking and air-proof coupling.

[0015] As an optimized solution, a sucker rod is fixedly connected to the upper end of the flexible plunger assembly, and a clearance channel is provided on the sand shield to avoid the sucker rod.

[0016] As an optimized solution, the side wall of the sand shield is provided with several oil outlets that connect the inner cavity of the upper pump cylinder with the upper cavity of the sand shield.

[0017] As an optimized solution, the lower end of the sedimentation pipe is fixedly connected to the outer wall of the sedimentation anti-air coupling.

[0018] As an optimized solution, the upper end of the sedimentation pipe is fixedly connected with a coupling.

[0019] Compared with the prior art, the beneficial effects of this utility model are: During the upstroke, the plunger moves upward, the forced-close fixed valve group opens, and the floating valve on the plunger is forcibly closed. When the plunger moves upward to the sand-proof and gas-proof coupling, the sand-proof and gas-proof coupling is connected to the lower chamber, and the gas in the liquid at the bottom of the pump barrel rises and enters the cavity of the sand-proof and gas-proof coupling. During the downstroke, the stroke moves downward, the forced-close fixed valve group closes, and the traveling valve on the plunger is forcibly opened. When the upper end of the plunger enters the sand and gas prevention coupling, the sand and gas prevention coupling is connected to the oil pipe. At this time, the gas stored in the sand and gas prevention coupling rises and is discharged into the oil pipe. At the same time, the sand and gas prevention coupling is filled with oil until the end of the downstroke. The sand-absorbing and air-proof coupling opens a channel for gas inside the pump, thereby increasing the filling coefficient of liquid in the working pump barrel, reducing the gas-liquid ratio inside the pump, eliminating gas interference, preventing the occurrence of air lock, and thus improving pump efficiency. The lower end of the lower pump barrel is connected to the bottom pump barrel. The oil inlet of the forced mechanical valve group is fixed with a plunger tube that is slidably constrained in the bottom pump barrel, forming a feedback pump structure. During the downstroke, hydraulic feedback force can be generated to help the rod column move downward and prevent the rod column from wearing out. The feedback force generated by the pump during the downstroke can overcome the friction between the heavy oil and the sucker rod, improve the stress condition of the sucker rod, and thus reduce the breakage of the sucker rod. By installing a sand-collecting pipe on the outside of the upper pump cylinder, a double-cylinder structure is achieved. Sand particles in the oil that are not carried to the ground can settle into the annular space outside the pump cylinder through the sand inlet channel, thus having a certain sand-collecting function. It adopts a flexible plunger structure, which has strong opening and closing functions and is suitable for wells with a large deviation of 85°. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model during the upper stroke; Figure 2 This is a schematic diagram of the structure of this utility model during the lower stroke.

[0022] In the diagram: 1-Sand settling pipe; 2-Lower pump barrel; 3-Sand settling anti-air coupling; 4-Flexible plunger assembly; 5-Suck rod; 6-Upper pump barrel; 7-Sand baffle; 8-Oil outlet; 9-Support sleeve; 10-Sand inlet channel; 11-Coupling; 12-Forced closing fixed valve group; 13-Annular sand settling cavity; 14-Bottom coupling; 15-Bottom pump barrel; 16-Plunger pipe; 17-Extension coupling. Detailed Implementation

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] like Figure 1 and Figure 2 As shown, the suspended, high-opening, hollow, gas-proof feedback pump includes an upper pump cylinder 6 and a lower pump cylinder 2 arranged side-by-side from top to bottom. The upper pump cylinder 6 and the lower pump cylinder 2 are connected by a sand-absorbing gas-proof coupling 3. The inner diameter of the sand-absorbing gas-proof coupling 3 is larger than the inner diameters of both the upper pump cylinder 6 and the lower pump cylinder 2. A flexible plunger assembly 4 is provided between the upper pump cylinder 6 and the lower pump cylinder 2, and a forced mechanical valve group is connected to the lower end of the flexible plunger assembly 4. The lower end of the lower pump cylinder 2 is connected to the bottom pump cylinder 15, and the oil inlet of the forced mechanical valve assembly is fixedly connected to the plunger pipe 16 which is slidably constrained inside the bottom pump cylinder 15.

[0025] The lower end of the lower pump cylinder 2 is connected to the bottom pump cylinder 15 via the bottom coupling 14.

[0026] An extension coupling 17 is also connected to the lower end of the lower pump cylinder 2.

[0027] The upper pump cylinder 6 is coaxially fitted with a sand settling pipe 1, and an annular sand settling cavity 13 is formed between the inner wall of the sand settling pipe 1 and the outer wall of the upper pump cylinder 6. A sand baffle 7 is fixedly connected to the upper end of the upper pump cylinder 6.

[0028] A support sleeve 9 is fixed between the outer wall of the upper pump cylinder 6 near the upper end and the inner wall of the sand settling pipe 1. Several sand inlet channels 10 are opened along the circumference of the support sleeve 9 to connect the cavity above the sand baffle 7 with the annular sand settling cavity 13.

[0029] During the upward stroke, the lower end of the flexible plunger assembly 4 enters the sand-proof and gas-proof coupling 3; during the downward stroke, the upper end of the flexible plunger assembly 4 enters the sand-proof and gas-proof coupling 3.

[0030] The upper end of the flexible plunger assembly 4 is fixed with a sucker rod 5, and the sand shield 7 is provided with a clearance channel to avoid the sucker rod 5.

[0031] The side wall of the sand shield 7 is provided with several oil outlets 8 that connect the inner cavity of the upper pump cylinder 6 with the upper cavity of the sand shield 7.

[0032] The lower end of the sedimentation pipe 1 is fixedly connected to the outer wall of the sedimentation and air-proof coupling 3.

[0033] The upper end of the sedimentation pipe 1 is fixed with a coupling 11.

[0034] The working principle of this device is as follows: During the upstroke, the plunger moves upward, the forced-close fixed valve group 12 opens, and the floating valve on the plunger is forcibly closed. When the plunger moves upward to the sand-proof and gas-proof coupling 3, the sand-proof and gas-proof coupling 3 is connected to the lower chamber, and the gas in the liquid at the bottom of the pump barrel rises and enters the cavity of the sand-proof and gas-proof coupling 3. During the downstroke, the stroke moves downward, the forced-close fixed valve group 12 closes, and the floating valve on the plunger is forcibly opened. When the upper end of the plunger enters the sand-proof and gas-proof coupling 3, the sand-proof and gas-proof coupling 3 is connected to the oil pipe. At this time, the gas stored in the sand-proof and gas-proof coupling 3 rises and is discharged into the oil pipe. At the same time, the sand-proof and gas-proof coupling 3 is filled with oil until the downstroke ends. The setting of the sand-proof and gas-proof coupling 3 opens up a channel for gas in the pump, thereby increasing the filling coefficient of liquid in the working pump barrel, reducing the gas-liquid ratio in the pump, eliminating gas interference, preventing the occurrence of gas lock phenomenon, and thus improving pump efficiency. The lower end of the lower pump barrel 2 is connected to the bottom pump barrel 15. The oil inlet of the forced mechanical valve group is fixedly connected to the plunger tube 16 which is slidably constrained in the bottom pump barrel 15, forming a feedback pump structure. During the downstroke, hydraulic feedback force can be generated to help the rod column move downward and prevent the rod column from wearing out. The feedback force generated by the pump during the downstroke can overcome the friction between the heavy oil and the sucker rod 5, improve the stress condition of the sucker rod 5, and thus reduce the breakage of the sucker rod 5. By installing a sand-collecting pipe 1 on the outside of the upper pump cylinder 6, a double-cylinder structure is achieved. Sand particles in the oil that are not carried to the ground can fall into the annular space outside the pump cylinder through the sand inlet channel 10, thus having a certain sand-collecting function. It adopts a flexible plunger structure, which has strong opening and closing functions and is suitable for wells with a large deviation of 85°.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A suspended, forced-opening, hollow, anti-gas feedback pump, characterized in that: It includes an upper pump cylinder (6) and a lower pump cylinder (2) arranged side by side from top to bottom. The upper pump cylinder (6) and the lower pump cylinder (2) are connected by a sand-proof and air-proof coupling (3). The inner diameter of the sand-proof and air-proof coupling (3) is larger than the inner diameter of the upper pump cylinder (6) and the lower pump cylinder (2). A flexible plunger assembly (4) is provided between the upper pump cylinder (6) and the lower pump cylinder (2) for reciprocating sliding. A forced mechanical valve group is connected to the lower end of the flexible plunger assembly (4). The lower end of the lower pump cylinder (2) is connected to the bottom pump cylinder (15), and the oil inlet of the forced mechanical valve group is fixedly connected to a plunger pipe (16) that is slidably constrained within the bottom pump cylinder (15).

2. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 1, characterized in that: The lower end of the lower pump cylinder (2) is connected to the bottom pump cylinder (15) via a bottom coupling (14).

3. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 1, characterized in that: The lower end of the lower pump cylinder (2) is also connected to an extension coupling (17).

4. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 1, characterized in that: The upper pump cylinder (6) is coaxially fitted with a sand settling pipe (1), and an annular sand settling cavity (13) is formed between the inner wall of the sand settling pipe (1) and the outer wall of the upper pump cylinder (6). A sand baffle (7) is fixedly connected to the upper end of the upper pump cylinder (6).

5. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 4, characterized in that: A support sleeve (9) is fixed between the outer wall of the upper pump cylinder (6) near the upper end and the inner wall of the sand settling pipe (1). The support sleeve (9) has several sand inlet channels (10) along the circumferential direction that connect the cavity above the sand baffle (7) with the annular sand settling cavity (13).

6. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 1, characterized in that: During the upward stroke, the lower end of the flexible plunger assembly (4) enters the sand-proof and gas-proof coupling (3); during the downward stroke, the upper end of the flexible plunger assembly (4) enters the sand-proof and gas-proof coupling (3).

7. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 4, characterized in that: The upper end of the flexible plunger assembly (4) is fixed with a sucker rod (5), and the sand shield (7) is provided with a clearance channel to avoid the sucker rod (5).

8. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 4, characterized in that: The side wall of the sand shield (7) is provided with a number of oil outlets (8) that connect the inner cavity of the upper pump cylinder (6) with the upper cavity of the sand shield (7).

9. The suspended forced-opening and shut-off hollow anti-gas feedback pump according to claim 4, characterized in that: The lower end of the sedimentation pipe (1) is fixedly connected to the outer wall of the sedimentation anti-air coupling (3).

10. The suspended, forced-opening, hollow anti-gas feedback pump according to claim 4, characterized in that: The upper end of the sedimentation pipe (1) is fixed with a coupling (11).

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