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Flexible combined oil pump plunger piston

An oil pump and plunger technology, which is applied in the field of petroleum machinery exploitation, can solve the problems of high machining precision, high leakage, and increase the downward resistance of the plunger, so as to prolong the effective sealing period, prolong the service life, reduce the The effect of severe wear

Active Publication Date: 2010-09-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) Due to the rigid connection between the metal hard seal plunger and the upstream and downstream valves, the precision of machining is very high; the gap between the plunger and the pump barrel is large, the leakage is high, and the life of the pump Short; fit clearance is small, easy to cause downhole pump stuck fault
[0004] 2) The mating surface between the rigid metal plunger and the pump barrel is long, which increases the downward resistance of the plunger and causes eccentric wear of the pump barrel and plunger; when used in an inclined well, the eccentric wear is more severe, resulting in an increase in the fit clearance , the leakage increases and the pump efficiency decreases

Method used

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  • Flexible combined oil pump plunger piston
  • Flexible combined oil pump plunger piston
  • Flexible combined oil pump plunger piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, there are two rigidly combined oil well pump plungers, including an upstream traveling valve, an upper plunger body 6, a flexible connector, a lower plunger body 18 and a lower traveling valve.

[0026] The upstream floating valve includes an upper joint 1, an upper valve housing 2, an upper valve cover 3, an upper valve ball 4 and an upper valve ball seat 5, the upper valve housing 2 is threadedly connected to the lower end of the upper joint 1, and the inner diameter of the upper valve housing 2 Fix the upper boss 2-1, install the upper valve ball seat 5, the upper valve ball 4 and the upper valve cover 3 sequentially above the upper boss 2-1, and the upper end of the upper valve cover 3 is pressed against the lower end of the upper joint 1 . The lower end of the upper valve casing 2 is threadedly connected to the upper plunger body 6 .

[0027] The flexible connector includes a ball connecting pipe 7 , a ball pressing cap 8 , a ball upper...

Embodiment 2

[0031] Such as figure 2 As shown, it is a rigid-flexible combined oil well pump plunger, including an upper floating valve, an upper soft sealing segment sealing body, a flexible connector, a lower plunger body 21' and a lower floating valve.

[0032] The upstream floating valve includes an upper joint 1', an upper valve housing 2', an upper valve cover 3', an upper valve ball 4' and an upper valve ball seat 5', and the upper valve housing 2' is threadedly connected to the lower end of the upper joint 1', The inner side of the upper valve casing 2' radially fixes the upper boss 2-1', and the upper part of the upper boss 2-1' is sequentially loaded with the upper valve ball seat 5', the upper valve ball 4' and the upper valve cover 3', and the upper The upper end of the valve cover 3' is pressed against the lower end of the upper joint 1'. The lower end of the upper valve casing 2 ′ is internally threaded to the central pipe 20 , and the lower end of the upper valve casing 2 ...

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Abstract

The invention provides a flexible combined oil pump plunger piston, which relates to the technical field of mechanical petroleum mining, in particular to a plunger piston used in an oil pump. The flexible combined oil pump plunger piston comprises an upstream movable valve, wherein the lower end of the upstream movable valve is sequentially connected with at least two sections of small-section sealing bodies, two adjacent sections of small-section sealing bodies are connected through a flexible connector, and the lower end of the small-section sealing body at the lowest end is connected with an upstream movable valve. After the adoption of the flexible connection between all small-section sealing bodies, the mutual rotation, eccentricity regulation and bending (at a small angle) of the small-section sealing bodies can be realized. The invention solves the problems of long rigidity matching surface of the plunger piston and a pump tube, great down operation resistance, severe camber wear of the pump tube and the plunger piston and the like, reduces the friction force formed during the down operation of the plunger piston, improves the sealing reliability of the plunger piston during the up operation, and simultaneously prolongs the effective sealing period.

Description

technical field [0001] The invention relates to the technical field of petroleum mechanical exploitation, in particular to a plunger used in an oil well pump. Background technique [0002] At present, the plunger of the deep well oil pump commonly used in the oil field is mainly a metal hard plunger, and the length of the matching sealing surface reaches 1200mm. If it meets the needs of deep well oil production, the matching gap between it and the pump barrel is required to be small. The main problems found in the field use of oil wells are as follows: [0003] 1) Due to the rigid connection between the metal hard seal plunger and the upstream and downstream valves, the precision of machining is very high; the gap between the plunger and the pump barrel is large, the leakage is high, and the life of the pump Short; the matching clearance is small, and it is easy to cause downhole pump failure. [0004] 2) The mating surface between the rigid metal plunger and the pump barr...

Claims

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Application Information

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IPC IPC(8): F04B53/14
Inventor 石建设杨海滨陆华飞狄敏燕刘松林李汉周张格
Owner CHINA PETROLEUM & CHEM CORP
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