Reciprocating electric submersible pump hollow piston

Abstract

The utility model discloses a reciprocating electric submersible pump hollow piston, and belongs to the technical field of oil exploitation equipment. Four annular grooves are vertically formed in the outer cylinder, the diameter of each annular groove is 0.2 mm larger than that of the outer cylinder, an upper overflowing limiting plate, an upper ball seat plate, a lower overflowing limiting plate and a lower ball seat plate are sequentially installed in the annular grooves of the outer cylinder from top to bottom, and the upper overflowing limiting plate, the upper ball seat plate, the lower overflowing limiting plate and the lower ball seat plate are connected with the annular grooves in an interference fit mode. The hollow piston has the advantages that the integral structure of an original hollow piston is split, the upper overflowing limiting plate, the upper ball seat plate, the lower overflowing limiting plate, the lower ball seat plate and the outer cylinder are machined respectively, and all the parts are assembled through hot assembly after machining; due to the fact that the upper overflowing limiting plate, the upper ball seat plate, the lower overflowing limiting plate, the lower ball seat plate and the annular groove are in interference fit, and the annular groove is 0.2 mm larger than the inner hole of the outer cylinder, the performance of an integrated structure is the same, the precision is improved, it is guaranteed that reverse leakage is avoided when crude oil is sucked and discharged, and the pump efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum exploitation equipment technical field especially relates to a reciprocating submersible electric pump hollow piston. BACKGROUND

[0002] Reciprocating submersible electric pump adopts hollow piston, moves up and down under the driving of submersible motor, and two valve balls in the hollow piston complete the actions of oil suction and oil discharge with the upper and lower ball seat holes in the process, the existing hollow piston as shown in the drawing comprises a cylinder body 1, a lower ball seat section 2, a lower limit flow section 4, an upper ball seat section 3 and an upper limit flow cap 5, due to the special structure, the ball seat hole in the middle cannot be processed, only the method of precision casting can be used to complete it, the sealing of valve ball and ball seat hole is not strict, and the pump efficiency is reduced. Fig. 1 BACKGROUND UTILITY MODEL CONTENT

[0003] In order to solve the problems of difficult hollow piston processing of the current reciprocating submersible electric pump and low pump efficiency, the utility model provides a reciprocating submersible electric pump hollow piston.

[0004] The utility model discloses a technical scheme is: a reciprocating submersible electric pump hollow piston, including the outer tube, four ring grooves are arranged in the outer tube and go up and down, the diameter of ring groove is 0.2mm more than the diameter of outer tube, the upper flow limit board, the upper ball seat board, the lower flow limit board and the lower ball seat board are installed in the ring groove of outer tube from top to bottom in proper order, and the upper flow limit board, the upper ball seat board, the lower flow limit board and the lower ball seat board are all connected with the ring groove and are in interference fit.

[0005] Still include lower spacer, middle spacer and upper spacer, lower spacer is located between lower ball seat board and lower flow limit board, middle spacer is located between lower flow limit board and upper ball seat board, and upper spacer is located between upper ball seat board and upper flow limit board.

[0006] The height size of upper flow limit board, upper ball seat board, lower flow limit board and lower ball seat board is consistent, and the height of ring groove is 2mm more than the height of upper flow limit board, upper ball seat board, lower flow limit board and lower ball seat board.

[0007] Upper flow limit board, upper ball seat board, lower flow limit board and lower ball seat board are all made of 316L material.

[0008] Flow holes that are uniformly arranged on the plate are processed on upper flow limit board and lower flow limit board, ball seat holes are processed in the center of upper ball seat board and lower ball seat board, a conical annular surface is processed on the ball seat hole, and the total area of flow hole is 1.5 times the area of ball seat hole.

[0009] The beneficial effects of this utility model are as follows: By disassembling the original integrated structure of the hollow piston, the upper flow limiting plate, upper ball seat plate, lower flow limiting plate, lower ball seat plate and outer cylinder are processed separately to ensure accuracy. After processing, each component is assembled by heat assembly. Since the upper flow limiting plate, upper ball seat plate, lower flow limiting plate, lower ball seat plate and annular groove are interference fit, and the annular groove is 0.2mm larger than the inner hole of the outer cylinder, each component can withstand the pressure during operation after installation. It has the same performance as the integrated structure, improves accuracy, and ensures that there is no reverse leakage when crude oil is sucked in and discharged, thereby improving pump efficiency. It can be manufactured using plate and pipe materials, eliminating the precision casting process and reducing costs. Attached Figure Description

[0010] Appendix Fig. 1 This is a schematic diagram of the structure of an existing hollow piston;

[0011] Appendix Fig. 2 This is a schematic diagram of the structure of this utility model;

[0012] Appendix Fig. 3 It is attached Fig. 2 Enlarged view of point A;

[0013] Appendix Fig. 4 This is an installation diagram of this utility model.

[0014] In the figure, 1-cylinder body, 101-annular groove, 2-lower ball seat section, 3-upper ball seat section, 4-lower limit flow section, 5-upper limit flow cap, 6-support seat, 7-lower partition sleeve, 8-middle partition sleeve, 9-upper partition sleeve, 10-lower flow limit plate, 11-upper flow limit plate, 12-flow hole, 13-ball seat hole, 14-upper ball seat plate, 15-lower ball seat plate, 16-outer cylinder. Detailed Implementation

[0015] like Figs. 1-4 As shown, a reciprocating submersible electric pump hollow piston includes an outer cylinder 16. Four annular grooves 101 are arranged vertically inside the outer cylinder 16. The diameter of the annular grooves 101 is 0.2 mm larger than the diameter of the outer cylinder 16. An upper flow limiting plate 11, an upper ball seat plate 14, a lower flow limiting plate 10, and a lower ball seat plate 15 are installed sequentially from top to bottom inside the annular grooves 101 of the outer cylinder 16. The upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10, and the lower ball seat plate 15 are all interference-fitted with the annular grooves 101.

[0016] It also includes a lower partition 7, a middle partition 8 and an upper partition 9 for height positioning during installation. The lower partition 7 is located between the lower ball seat plate 15 and the lower flow limiting plate 10, the middle partition 8 is located between the lower flow limiting plate 10 and the upper ball seat plate 14, and the upper partition 9 is located between the upper ball seat plate 14 and the upper flow limiting plate 11.

[0017] The height dimensions of the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10 and the lower ball seat plate 15 are consistent, the height of the ring groove 101 is 2mm greater than the height of the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10 and the lower ball seat plate 15, thereby reducing the assembly precision.

[0018] The upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10 and the lower ball seat plate 15 are made of 316L material, the 316L material is not corroded, has a long service life, and is relatively soft, and when sealing with the valve ball, the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10 and the lower ball seat plate 15 will deform with the shape of the valve ball, and the sealing performance is better.

[0019] The upper flow limiting plate 11 and the lower flow limiting plate 10 are both processed with flow holes 12 arranged uniformly on the plates, and the center of the upper ball seat plate 14 and the lower ball seat plate 15 is processed with a ball seat hole 13, a conical annular surface is processed on the ball seat hole 13, and the total area of the flow holes 12 is 1.5 times the area of the ball seat hole 13, thereby limiting while not hindering the flow of the sucked crude oil.

[0020] When installing, a support seat 6 can be made as a tool, the support seat 6 includes a seat plate and a support pipe, the seat plate and the support pipe are an integral structure, the support pipe is located at the upper part of the seat plate, the outer cylinder 16 falls on the seat plate, the support pipe supports upwardly at the position of the lower ball seat plate 15, the outer cylinder 16 is heated to 280-300°C, at this time, the inner hole of the outer cylinder 16 is greater than the outer diameter of the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10 and the lower ball seat plate 15, the lower ball seat plate 15, the lower spacer sleeve 7, the lower flow limiting plate 10, the middle spacer sleeve 8, the upper ball seat plate 14, the upper spacer sleeve 9 and the upper flow limiting plate 11 are sequentially loaded into the outer cylinder 16, and the whole installation is completed after waiting for the outer cylinder 16 to naturally cool to room temperature, of course, for overall assembly consideration, the valve ball can be simultaneously loaded into the upper part of the lower ball seat plate 15 and the upper part of the upper ball seat plate 14.

[0021] By splitting the integral structure of the original hollow piston, the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10, the lower ball seat plate 15 and the outer cylinder 16 can be processed, after processing, the components are assembled by using hot assembly, since the upper flow limiting plate 11, the upper ball seat plate 14, the lower flow limiting plate 10, the lower ball seat plate 15 and the ring groove 101 are interference fit, and the ring groove 101 is 0.2mm greater than the inner hole of the outer cylinder 16, so that each component can withstand the pressure during work, has the same performance as the integral structure, the precision is improved, ensures that the sucked and discharged crude oil will not leak reversely, thereby improving the pump efficiency.

Claims

1. A reciprocating electrical submersible pump hollow piston comprising an outer cylinder (16), characterized in that: Four annular grooves (101) are arranged in the outer cylinder (16) from top to bottom, the diameter of the annular groove (101) is 0.2mm larger than the diameter of the outer cylinder (16), the upper overflow limiting plate (11), the upper ball seat plate (14), the lower overflow limiting plate (10) and the lower ball seat plate (15) are sequentially installed in the annular groove (101) of the outer cylinder (16) from top to bottom, and the upper overflow limiting plate (11), the upper ball seat plate (14), the lower overflow limiting plate (10) and the lower ball seat plate (15) are connected with the annular groove (101) in interference fit.

2. A hollow piston for a reciprocating electric submersible pump as defined in claim 1, characterized in that: It also includes a lower spacer sleeve (7), a middle spacer sleeve (8) and an upper spacer sleeve (9), the lower spacer sleeve (7) is located between the lower ball seat plate (15) and the lower overflow limiting plate (10), the middle spacer sleeve (8) is located between the lower overflow limiting plate (10) and the upper ball seat plate (14), and the upper spacer sleeve (9) is located between the upper ball seat plate (14) and the upper overflow limiting plate (11).

3. A hollow piston for a reciprocating electric submersible pump as defined in claim 1, wherein: The height of the upper overflow limiting plate (11), the upper ball seat plate (14), the lower overflow limiting plate (10) and the lower ball seat plate (15) is consistent, and the height of the annular groove (101) is 2mm greater than the height of the upper overflow limiting plate (11), the upper ball seat plate (14), the lower overflow limiting plate (10) and the lower ball seat plate (15).

4. A hollow piston for a reciprocating electric submersible pump as defined in claim 1, wherein: The upper overflow limiting plate (11), the upper ball seat plate (14), the lower overflow limiting plate (10) and the lower ball seat plate (15) are all made of 316L material.

5. A hollow piston for a reciprocating electric submersible pump as defined in claim 1, wherein: Overflow holes (12) are processed on the upper overflow limiting plate (11) and the lower overflow limiting plate (10), the center of the upper ball seat plate (14) and the lower ball seat plate (15) is processed with a ball seat hole (13), a conical annular surface is processed on the ball seat hole (13), and the total area of the overflow hole (12) is 1.5 times the area of the ball seat hole (13).

Images