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A flexible combined oil well pump plunger

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, reduce severe wear and prolong the The effect of service life

Active Publication Date: 2011-12-21
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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  • A flexible combined oil well pump plunger
  • A flexible combined oil well pump plunger
  • A flexible combined oil well pump plunger

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 shell 2' radially fixes the upper boss 2-1', and the upper part of the upper boss 2-1' is sequentially loaded into 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 i...

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Abstract

A flexible combined oil well pump plunger relates to the technical field of petroleum machinery exploitation, in particular to a plunger used in an oil well pump, including an upstream floating valve, the lower end of which is sequentially connected to at least two small sections of sealing body, two adjacent sections The small sealing bodies are connected by flexible connectors, and the lower end of the lowermost small sealing body is connected to the downstream floating valve. After adopting flexible connection between each small section of sealing bodies, they can be rotated, eccentrically adjusted and bent (small angle) with each other. It solves the problems of long rigid mating surface between plunger and pump barrel, large downward resistance, serious eccentric wear of pump barrel and plunger in high-inclination oil wells, and reduces the frictional resistance formed when the plunger descends. The sealing reliability of the upward movement of the plunger is increased, and the effective sealing period is extended at the same time.

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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Patent Type & Authority Patents(China)
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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