Heavy ball and heavy seat sand prevention valve oil drainage device

Abstract

The utility model relates to the technical field of oil well exploitation, in particular to a heavy ball and heavy seat sand prevention valve oil drainage device which comprises an oil drainage upper connector, the left side of the oil drainage upper connector is communicated with an outer pipe, a central pipe is arranged in an inner cavity of the outer pipe, the right side of the central pipe is communicated with a first valve seat, a first valve ball is arranged on the right side of the first valve seat, and a second valve ball is arranged on the right side of the first valve seat. An upper cover is arranged on the outer side of the first valve ball, the left side of the center pipe communicates with a lower connecting piece, and the left side of the outer pipe communicates with a lower connector. The upper cover, the first valve ball, the first valve seat, the center pipe, the outer pipe and the lower connecting piece are used in cooperation, in the using process, clean oil liquid due to a circular seam enters an oil well pump through the oil drainage upper connector, when an oil well is overhauled, a weighting rod is used for impacting an oil drainage plug, and the oil drainage plug is prevented from being damaged. And after the oil drainage plug pin is sheared off, liquid in the production pipe column returns to the well, and therefore the oil drainage function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well pumping, in particular to a heavy ball and heavy seat anti-sand valve oil leakage device. Background Art

[0002] Oil well pumping refers to the process of extracting underground oil to the surface through certain technical means. In oil wells, equipment such as sucker rods or electric submersible pumps are usually used to extract oil. In the process of oil well pumping, heavy ball and heavy seat anti-sand valve oil leakage devices are often needed.

[0003] After searching, the announcement number is CN213331023U, and the name is sand control valve oil leakage device, which includes an upper joint, an outer pipe, a center pipe and a lower joint. Through research and analysis, it is found that although it has the advantage of sand control, it still has the following disadvantages to a certain extent.

[0004] For example, the sand-proof valve oil leakage device mentioned above only has a certain one-way oil discharge function during use. At the same time, the sand storage space of its main body is relatively insufficient, resulting in failure of the first valve ball and the seat due to excessive sand over time, and finally leading to leakage. In order to solve the above technical problems, we designed a heavy-ball and heavy-seat sand-proof valve oil leakage device. Utility Model Content

[0005] The purpose of the utility model is to provide a heavy-ball and heavy-seat anti-sand valve oil leakage device, which has the advantages of high key structural strength and a large sand prevention space, and solves the problem that the first valve ball and the first valve seat are not strong enough in structure and do not have a large sand prevention space, thus affecting the service life.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heavy ball and heavy seat anti-sand valve oil leakage device, comprising an oil leakage upper joint, the left side of the oil leakage upper joint is connected with an outer tube, the inner cavity of the outer tube is provided with a center tube, the right side of the center tube is connected with a first valve seat, the right side of the first valve seat is provided with a first valve ball, the outer side of the first valve ball is provided with an upper cover, the left side of the center tube is connected with a lower connecting piece, the left side of the outer tube is connected with a lower joint, the left side of the lower connecting piece is connected with a second valve seat, and the inner side of the second valve seat is provided with a second valve ball.

[0007] Preferably, the second valvular ball comprises a base sphere, a surface fixing sleeve of the base sphere is provided with a reinforcement layer, a surface fixing sleeve of the reinforcement layer is provided with a corrosion-resistant layer, and a high-strength coating is sprayed on the surface of the corrosion-resistant layer.

[0008] Preferably, the base sphere is made of a cemented carbide material, the reinforcement layer is made of a Hastelloy material, the corrosion-resistant layer is made of a titanium alloy material, and the high-strength coating is sprayed with a fluorocarbon material.

[0009] Preferably, an oil drain plug is provided through the top of the oil drain upper joint, and an O-ring is fixedly sleeved at the center of the surface of the oil drain plug.

[0010] Preferably, a gasket is provided on the outer side of the oil drain plug and on the top of the O-ring, and a rivet is provided through the outer side of the top of the oil drain plug.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] 1. The utility model is provided with an upper cover, a first valve ball, a first valve seat, a central tube, an outer tube and a lower connecting piece. During use, clean oil can enter the oil pump through the oil drain upper joint due to the annular gap. When the oil well is repaired, the weighted rod is used to hit the oil drain plug. After the oil drain plug pin is cut off, the liquid in the production pipe string returns to the well, thereby realizing the oil drain function.

[0013] 2. The utility model provides a second valve seat, a lower joint, a gasket, an O-ring, an oil drain plug, a rivet, a base sphere and a reinforcement layer for coordinated use. During use, the produced fluid from the oil well can enter the central pipe through the lower joint, via the lower valve assembly consisting of the second valve ball and the second valve seat, and then enter the annular gap between the central pipe and the outer pipe through the upper valve assembly consisting of the first valve ball and the first valve seat. At this time, the sand and slag contained in the oil are deposited in the lower part of the annular gap under the action of gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 For this utility model Figure 1 A magnified view of middle;

[0016] Figure 3 It is a top view schematic diagram of the local structure of the utility model;

[0017] Figure 4 It is a three-dimensional cross-sectional schematic diagram of the local structure of the utility model.

[0018] In the figure: 1. upper oil drain joint; 2. upper cover; 3. first valvable ball; 4. first valvable seat; 5. center tube; 6. outer tube; 7. lower connecting piece; 8. second valvable ball; 9. second valvable seat; 10. lower joint; 11. gasket; 12. O-ring; 13. oil drain plug; 14. rivet; 15. base sphere; 16. reinforcement layer; 17. corrosion-resistant layer; 18. high-strength coating. DETAILED DESCRIPTION

[0019] See also Figure 1-Figure 4The heavy ball and heavy seat anti-sand valve oil leakage device comprises an oil leakage upper joint 1, the left side of the oil leakage upper joint 1 is connected with an outer tube 6, the inner cavity of the outer tube 6 is provided with a central tube 5, the right side of the central tube 5 is connected with a first valve seat 4, the right side of the first valve seat 4 is provided with a first valve ball 3, the outer side of the first valve ball 3 is provided with an upper cover 2, the left side of the central tube 5 is connected with a lower connecting piece 7, the left side of the outer tube 6 is connected with a lower joint 10, the left side of the lower connecting piece 7 is connected with a second valve seat 9, and the inner side of the second valve seat 9 is provided with a second valve ball 8.

[0020] See also Figure 4 The second valve ball 8 includes a base sphere 15, and a reinforcement layer 16 is fixedly provided on the surface of the base sphere 15. By setting the reinforcement layer 16, the corrosion resistance and supporting strength of the main body can be improved by fully covering the surface of the base sphere 15. The surface of the reinforcement layer 16 is fixedly provided with a corrosion-resistant layer 17. By setting the corrosion-resistant layer 17, the supporting strength and protective effect of the second valve ball 8 can be improved by fully wrapping the reinforcement layer 16. The surface of the corrosion-resistant layer 17 is sprayed with a high-strength coating 18. By setting the high-strength coating 18, the wear resistance and wrapping strength of the main body can be improved by surface spraying.

[0021] See also Figure 4 The base sphere 15 is made of a hard alloy material, the reinforcement layer 16 is made of a Hastelloy material, the corrosion-resistant layer 17 is made of a titanium alloy material, and the high-strength coating 18 is sprayed with a fluorocarbon material.

[0022] See also Figure 2 An oil drain plug 13 is provided through the top of the oil drain upper joint 1, and an O-ring 12 is fixedly sleeved at the center of the surface of the oil drain plug 13. By providing the O-ring 12, the contact sealing between the oil drain plug 13 and the inner wall of the oil drain upper joint 1 can be improved, thereby avoiding the occurrence of failures due to insufficient sealing during the oil drain process.

[0023] See also Figure 2 A gasket 11 is provided on the outside of the oil drain plug 13 and on the top of the O-ring 12 , and a rivet 14 is provided on the outside of the top of the oil drain plug 13 .

[0024] When in use, during normal exploitation, the produced fluid from the oil well passes through the lower joint 10, through the lower valve assembly composed of the second valve ball 8 and the second valve seat 9, enters the central pipe 5, and then enters the annular gap between the central pipe 5 and the outer pipe 6 through the upper valve assembly composed of the first valve ball 3 and the first valve seat 4. At this time, the sand and slag contained in the oil are deposited in the lower part of the annular gap under the action of gravity, and the clean oil due to the annular gap passes through the oil leakage upper joint 1 and enters the oil pump. When the oil well is repaired, the weighted rod is used to impact the oil leakage plug 13. After the pin of the oil leakage plug 13 is sheared off, the liquid in the production pipe string returns to the well, thereby realizing the oil leakage function.

[0025] In summary: the heavy ball and heavy seat anti-sand valve oil leakage device, by arranging the second valve ball 8, the second valve seat 9, the lower joint 10, the gasket 11, the O-ring 12, the oil leakage plug 13, the rivet 14, the base sphere 15, the reinforcement layer 16 and the corrosion-resistant layer 17, solves the problem that the first valve ball and the first valve seat have insufficient structural strength and do not have a large sand prevention space, thereby affecting their service life.

Claims

1. A heavy ball and heavy seat anti-sand valve oil leakage device, comprising an oil leakage upper joint (1), characterized in that: The left side of the oil leakage upper joint (1) is connected to an outer tube (6), the inner cavity of the outer tube (6) is provided with a central tube (5), the right side of the central tube (5) is connected to a first valve seat (4), the right side of the first valve seat (4) is provided with a first valve ball (3), the outer side of the first valve ball (3) is provided with an upper cover (2), the left side of the central tube (5) is connected to a lower connecting piece (7), the left side of the outer tube (6) is connected to a lower joint (10), the left side of the lower connecting piece (7) is connected to a second valve seat (9), and the inner side of the second valve seat (9) is provided with a second valve ball (8).

2. The heavy ball and heavy seat anti-sand valve oil leakage device according to claim 1 is characterized in that: The second valve ball (8) comprises a base sphere (15), a surface fixed sleeve of the base sphere (15) is provided with a reinforcement layer (16), a surface fixed sleeve of the reinforcement layer (16) is provided with a corrosion-resistant layer (17), and a surface of the corrosion-resistant layer (17) is sprayed with a high-strength coating (18).

3. The heavy ball and heavy seat anti-sand valve oil leakage device according to claim 2 is characterized in that: The base sphere (15) is made of a hard alloy material, the reinforcement layer (16) is made of a Hastelloy material, the corrosion-resistant layer (17) is made of a titanium alloy material, and the high-strength coating (18) is sprayed with a fluorocarbon material.

4. The heavy ball and heavy seat anti-sand valve oil leakage device according to claim 1 is characterized in that: An oil drain plug (13) is provided through the top of the oil drain upper joint (1), and an O-type sealing ring (12) is fixedly sleeved at the center of the surface of the oil drain plug (13).

5. The heavy ball and heavy seat anti-sand valve oil leakage device according to claim 4 is characterized in that: A gasket (11) is arranged on the outside of the oil drain plug (13) and located on the top of the O-ring (12), and a rivet (14) is arranged through the outside of the top of the oil drain plug (13).

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