Double fixed valve sand prevention and sticking oil well pump

Abstract

This utility model relates to the field of oil and gas field development technology, and in particular to a double-fixed-valve sand-sinking and anti-jamming oil pump. It includes an outer pump barrel, tubing couplings, a plunger, an inner cylinder assembly, a traveling valve assembly, two sets of fixed valve assemblies, and a suspension joint. The inner cylinder assembly is located around the plunger, and the outer pump barrel is located around the inner cylinder assembly. A guide and centering block is provided between the plunger and the outer pump barrel. The traveling valve assembly is located at both ends of the plunger. A set of tubing couplings is provided at both ends of the outer pump barrel. One end of the outer pump barrel is connected to a suspension joint via the tubing coupling. Two sets of fixed valve assemblies are sequentially provided at one end of the suspension joint. This utility model, through the double-layer pump barrel structure formed by the inner cylinder assembly and the outer pump barrel, can create a sand-sinking channel between the outer pump barrel and the inner cylinder assembly to guide and accommodate sand particles, preventing sand, scale, and other impurities from falling back and causing pump jamming. Furthermore, the two sets of fixed valve assemblies work together to better ensure the sealing of the pump barrel and effectively reduce leakage.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field development technology, and in particular to a dual fixed valve sand-sinking and anti-jamming oil pump. Background Technology

[0002] As a core lifting device in oil extraction, rod-driven oil pumps are widely used in oilfields worldwide. They drive a plunger to reciprocate within the pump barrel via a sucker rod, enabling the intake and discharge of crude oil. They have advantages such as simple structure, reliable operation, and strong adaptability, and have become an indispensable technical means for the extraction of traditional oilfields and heterogeneous reservoirs.

[0003] However, in oils with high sand content, traditional oil pumps generally have sand particles entering the pump along with the crude oil. These particles tend to deposit in the gap between the plunger and the pump barrel, leading to increased friction, seal failure, or even pump jamming. This results in frequent well workover operations, a significant decrease in production efficiency, and a substantial increase in extraction costs.

[0004] Therefore, to address the above problems, a double-fixed-valve sand-sinking and anti-jamming oil pump can be designed. Through the design of a double-layer pump barrel, a sand-sinking channel is built between the inner and outer pump barrels to guide and contain sand particles, preventing sand, scale and other impurities from falling back into the gap between the plunger and the pump barrel and causing pump jamming. At the same time, a double-fixed-valve structure is built at the oil suction end to work together to better ensure the sealing of the pump barrel and effectively reduce leakage. Utility Model Content

[0005] In order to overcome the problem that sand particles commonly enter the pump with crude oil in traditional oil pumps, easily deposit in the gap between the plunger and the pump barrel, leading to increased friction, seal failure, or even pump jamming, resulting in frequent well workover operations, a significant decrease in production efficiency, and a significant increase in extraction costs.

[0006] The technical solution of this utility model is as follows: a double fixed valve sand-sinking and anti-jamming oil pump, including an outer pump barrel, an oil pipe coupling, a plunger, an inner cylinder assembly, a floating valve assembly, two sets of fixed valve assemblies and a suspension joint. The inner cylinder assembly is located around the plunger, and the outer pump barrel is located around the inner cylinder assembly. A guide and centering block is provided between the plunger and the outer pump barrel. The floating valve assembly is located at both ends of the plunger. Each end of the outer pump barrel is provided with a set of oil pipe couplings. One end of the outer pump barrel is connected to a suspension joint through the oil pipe couplings. Two sets of fixed valve assemblies are sequentially provided at one end of the suspension joint.

[0007] Preferably, by setting the inner cylinder assembly and the outer pump cylinder to form a double-layer pump cylinder structure, a sand settling channel can be built between the outer pump cylinder and the inner cylinder assembly to guide and contain sand particles, preventing sand, scale and other impurities from falling back and causing pump jamming. Two sets of oil pipe couplings are set to connect the outer pump cylinder with the traveling valve assembly and the suspension joint. The traveling valve assembly works with the plunger to complete the oil pumping operation. The guide and centering block can guide the movement of the plunger. The suspension joint connects the fixed valve assembly with the outer pump cylinder. By setting two sets of fixed valve assemblies to work together, the sealing performance of the pump cylinder is better guaranteed, and leakage is effectively reduced.

[0008] Preferably, the inner cylinder assembly includes an inner pump cylinder and an extended pump cylinder, both of which are located around the plunger and are connected and fixed by a coupling.

[0009] Preferably, the total length of the inner pump cylinder and the extended pump cylinder is the same as the length of the outer pump cylinder.

[0010] Preferably, the traveling valve assembly includes a traveling valve body, a traveling valve cover, and a traveling valve connector. The traveling valve body is located at the oil outlet end of the plunger, the traveling valve connector is located between the plunger and the traveling valve body, and the traveling valve cover is located at one end of the traveling valve body.

[0011] Preferably, the length of the plunger is greater than the total length of the inner pump cylinder and the extended pump cylinder, so that the upstream moving valve cover is always located on the periphery of the outer pump cylinder.

[0012] Preferably, the traveling valve assembly includes a downstream traveling valve body, a downstream traveling valve cover, and a downstream traveling valve connector. The downstream traveling valve body is located at the other end of the plunger, the downstream traveling valve cover is disposed between the downstream traveling valve body and the plunger, and the downstream traveling valve connector is disposed at one end of the downstream traveling valve body and connected to the suspension connector.

[0013] Preferably, the fixed valve assembly includes a fixed valve body and a fixed valve connector, with the fixed valve connector located at one end of the fixed valve body and the fixed valve body located at one end of the suspension connector.

[0014] The beneficial effects of this utility model are: 1. By forming a double-layer pump cylinder structure with the inner cylinder assembly and the outer pump cylinder, a sand settling channel can be built between the outer pump cylinder and the inner cylinder assembly to guide and contain sand particles, and prevent sand, scale and other impurities from falling back and causing pump jamming. 2. The two fixed valve bodies are connected and work together through a fixed valve connector to better ensure the sealing of the pump cylinder and effectively reduce leakage. 3. The length of the plunger is greater than the total length of the inner pump cylinder and the extended pump cylinder, so that when the plunger is at the bottom dead center, the upstream moving valve body, the upstream moving valve cover and the upstream moving valve connector are all located on the periphery of the outer pump cylinder, effectively preventing impurities such as sand and scale from entering the outer pump cylinder. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of the dual-fixed-valve sand-sinking and anti-jamming oil pump of this utility model. Figure 2 The diagram shown is a three-dimensional cross-sectional view of the dual-fixed-valve sand-sinking and anti-jamming oil pump of this utility model. Figure 3 The diagram shown is a three-dimensional exploded view of the inner cylinder assembly of the double-fixed valve sand-sinking and anti-jamming oil pump of this utility model. Figure 4 This invention relates to a dual-fixed-valve anti-seize and sand-sinking oil pump. Figure 2 Schematic diagram of the three-dimensional structure at point A (circle); Figure 5 This invention relates to a dual-fixed-valve anti-seize and sand-sinking oil pump. Figure 2 Schematic diagram of the three-dimensional structure at point B (circle); Explanation of reference numerals in the attached drawings: 1. Outer pump barrel; 101. Oil pipe coupling; 2. Plunger; 201. Guide and centralizing block; 301. Inner pump barrel; 302. Extended pump barrel; 401. Upstream moving valve body; 402. Upstream moving valve cover; 403. Upstream moving valve connector; 404. Downstream moving valve body; 405. Downstream moving valve cover; 406. Downstream moving valve connector; 501. Fixed valve body; 502. Fixed valve connector; 6. Suspension connector. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Please see Figure 1 , Figure 2 and Figure 4This utility model provides an embodiment: a dual-fixed-valve sand-sinking and anti-jamming oil pump, including an outer pump barrel 1, an oil pipe coupling 101, a plunger 2, an inner cylinder assembly, a floating valve assembly, two sets of fixed valve assemblies, and a suspension connector 6. The inner cylinder assembly is disposed around the plunger 2, and the outer pump barrel 1 is disposed around the inner cylinder assembly. A guide and centering block 201 is disposed between the plunger 2 and the outer pump barrel 1. The floating valve assembly is disposed at both ends of the plunger 2. An oil pipe coupling 101 is disposed at both ends of the outer pump barrel 1. One end of the outer pump barrel 1 is connected to the suspension connector 6 through the oil pipe coupling 101. Two sets of fixed valve assemblies are sequentially disposed at one end of the suspension connector 6. The inner cylinder assembly and the outer pump cylinder 1 form a double-layer pump cylinder structure, which can create a sand settling channel between the outer pump cylinder 1 and the inner cylinder assembly to guide and contain sand particles, preventing sand, scale and other impurities from falling back and causing pump jamming. Two sets of oil pipe couplings 101 are set to connect the outer pump cylinder 1 with the traveling valve assembly and the suspension joint 6. The traveling valve assembly works with the plunger 2 to complete the oil pumping operation. The guide and centering block 201 can guide the movement of the plunger 2. The suspension joint 6 connects the fixed valve assembly with the outer pump cylinder 1. By setting two sets of fixed valve assemblies to work together, the sealing of the pump cylinder is better guaranteed and leakage is effectively reduced.

[0018] Please see Figure 2 and Figure 3 In this embodiment, the inner cylinder assembly includes an inner pump cylinder 301 and an extended pump cylinder 302. Both the inner pump cylinder 301 and the extended pump cylinder 302 are located around the plunger 2. The inner pump cylinder 301 and the extended pump cylinder 302 are connected and fixed by a coupling. The total length of the spliced ​​inner pump cylinder 301 and the extended pump cylinder 302 is the same as the length of the outer pump cylinder 1. By setting the extended pump cylinder 302 to lengthen the inner pump cylinder 301 of the traditional rod-type oil pump, the sealing section of the oil pump is lengthened, the leakage is reduced, the pump efficiency is improved, and a sand settling channel is formed in conjunction with the outer pump cylinder 1.

[0019] Please see Figure 2 , Figure 4 and Figure 5In this embodiment, the traveling valve assembly includes an upstream traveling valve body 401, an upstream traveling valve cover 402, and an upstream traveling valve connector 403. The upstream traveling valve body 401 is located at the oil outlet end of the plunger 2, the upstream traveling valve connector 403 is located between the plunger 2 and the upstream traveling valve body 401, and the upstream traveling valve cover 402 is located at one end of the upstream traveling valve body 401. The length of the plunger 2 is greater than the total splicing length of the inner pump cylinder 301 and the extended pump cylinder 302, so that the upstream traveling valve cover 402 is always located on the periphery of the outer pump cylinder 1. By setting the upstream traveling valve connector 403 to connect the upstream traveling valve body 401 and the plunger 2, and the length of the plunger 2 is greater than the total splicing length of the inner pump cylinder 301 and the extended pump cylinder 302, when the plunger 2 is at the bottom dead center, the upstream traveling valve body 401, the upstream traveling valve cover 402, and the upstream traveling valve connector 403 are all located on the periphery of the outer pump cylinder 1, effectively preventing impurities such as sand and scale from entering the outer pump cylinder 1. The system includes a downstream moving valve body 404, a downstream moving valve cover 405, and a downstream moving valve connector 406. The downstream moving valve body 404 is located at the other end of the plunger 2. The downstream moving valve cover 405 is located between the downstream moving valve body 404 and the plunger 2. The downstream moving valve connector 406 is located at one end of the downstream moving valve body 404 and is connected to the suspension connector 6. The downstream moving valve body 404 is connected to two sets of fixed valve assemblies by setting the downstream moving valve connector 406 in conjunction with the suspension connector 6. The downstream moving valve cover 405 connects the downstream moving valve body 404 to the plunger 2. The fixed valve assembly includes a fixed valve body 501 and a fixed valve connector 502. The fixed valve connector 502 is located at one end of the fixed valve body 501, and the fixed valve body 501 is located at one end of the suspension connector 6. The two fixed valve bodies 501 are connected and work together through the fixed valve connector 502 to better ensure the sealing of the pump barrel and effectively reduce leakage.

[0020] During the upward stroke of the oil pumping operation, under the action of submersion pressure and pump pressure difference, the two sets of fixed valve bodies 501 open, the upstream moving valve body 401 and the downstream moving valve body 404 are closed, the inner pump barrel 301 and the extended pump barrel 302 draw in crude oil, and the wellhead discharges crude oil. During the downstroke, the upstream moving valve body 401 and the downstream moving valve body 404 are opened, and the two sets of fixed valve bodies 501 are closed. The crude oil in the inner pump cylinder 301 and the extended pump cylinder 302 is drawn into the plunger 2 through the downstream moving valve body 404. The crude oil in the plunger 2 is discharged through the upstream moving valve body 401. Sand, scale and other impurities are discharged from the plunger 2 and deposited in the annular sand settling channel constructed by the guide straightening block 201 and the plunger 2 through the gap between the guide straightening block 201 and the plunger 2, effectively avoiding pump jamming. Since the length of the plunger 2 is greater than the total length of the inner pump cylinder 301 and the extended pump cylinder 302, when the plunger 2 is at the bottom dead center, the upstream moving valve body 401, the upstream moving valve cover 402 and the upstream moving valve connector 403 are all located on the periphery of the outer pump cylinder 1, which effectively prevents impurities such as sand and scale from entering the outer pump cylinder 1 and further reduces the probability of pump jamming.

[0021] Through the above steps, a double-layer pump barrel structure is formed by the inner cylinder assembly and the outer pump barrel 1. A sand settling channel can be built between the outer pump barrel 1 and the inner cylinder assembly to guide and accommodate sand particles, preventing sand, scale and other impurities from falling back and causing pump jamming. The two sets of fixed valve assemblies work together to better ensure the sealing of the pump barrel and effectively reduce leakage. This solves the problem that in traditional oil pumps, sand particles enter the pump with crude oil and easily deposit in the gap between the plunger 2 and the pump barrel, leading to increased friction, sealing failure and even pump jamming, resulting in frequent well workover operations, a significant decrease in production efficiency and a significant increase in extraction costs.

[0022] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A dual-fixed-valve sand-sinking and anti-jamming oil pump, comprising a plunger (2), characterized in that: It also includes an outer pump barrel (1), a tubing coupling (101), an inner cylinder assembly, a traveling valve assembly, two sets of fixed valve assemblies, and a suspension connector (6). The inner cylinder assembly is located around the plunger (2), and the outer pump barrel (1) is located around the inner cylinder assembly. A guide and centering block (201) is provided between the plunger (2) and the outer pump barrel (1). The traveling valve assembly is located at both ends of the plunger (2). A set of tubing couplings (101) is provided at both ends of the outer pump barrel (1). One end of the outer pump barrel (1) is connected to the suspension connector (6) through the tubing coupling (101). Two sets of fixed valve assemblies are sequentially provided at one end of the suspension connector (6).

2. The dual-fixed-valve sand-sinking and anti-jamming oil pump according to claim 1, characterized in that: The inner cylinder assembly includes an inner pump cylinder (301) and an extended pump cylinder (302). Both the inner pump cylinder (301) and the extended pump cylinder (302) are located on the periphery of the plunger (2). The inner pump cylinder (301) and the extended pump cylinder (302) are connected and fixed by a coupling.

3. The dual-fixed-valve sand-sinking and anti-jamming oil pump according to claim 2, characterized in that: The total length of the inner pump cylinder (301) and the extended pump cylinder (302) is the same as the length of the outer pump cylinder (1).

4. The dual-fixed-valve sand-sinking and anti-jamming oil pump according to claim 2, characterized in that: The moving valve assembly includes an upstream moving valve body (401), an upstream moving valve cover (402), and an upstream moving valve connector (403). The upstream moving valve body (401) is located at the oil outlet end of the plunger (2), the upstream moving valve connector (403) is located between the plunger (2) and the upstream moving valve body (401), and the upstream moving valve cover (402) is located at one end of the upstream moving valve body (401).

5. A dual-fixed-valve anti-sand-jamming oil pump according to claim 4, characterized in that: The length of the plunger (2) is greater than the total length of the splice of the inner pump cylinder (301) and the extended pump cylinder (302), so that the upstream moving valve cover (402) is always located on the periphery of the outer pump cylinder (1).

6. The dual-fixed-valve sand-sinking and anti-jamming oil pump according to claim 4, characterized in that: The moving valve assembly includes a downstream moving valve body (404), a downstream moving valve cover (405), and a downstream moving valve connector (406). The downstream moving valve body (404) is located at the other end of the plunger (2), the downstream moving valve cover (405) is disposed between the downstream moving valve body (404) and the plunger (2), and the downstream moving valve connector (406) is disposed at one end of the downstream moving valve body (404) and connected to the suspension connector (6).

7. The dual fixed valve sand-sinking and anti-jamming oil pump according to claim 1, characterized in that: The fixed valve assembly includes a fixed valve body (501) and a fixed valve connector (502). The fixed valve connector (502) is located at one end of the fixed valve body (501), and the fixed valve body (501) is located at one end of the suspension connector (6).

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