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An oil well casing pressure control device

A control device and technology for oil wells, which are applied in wellbore/well valve devices, wellbore/well components, earth-moving drilling, etc., can solve the problems of inability to automatically control casing pressure, low efficiency, and large manual workload, etc. Achieve the effect of reducing environmental pollution and potential safety hazards, solving large manual workload, and improving pump efficiency and system efficiency

Active Publication Date: 2017-10-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a casing pressure control device for oil wells, which overcomes the problems of large manual workload and low efficiency in oil well casing pressure control in the existing crude oil production, and cannot realize automatic control of casing pressure

Method used

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  • An oil well casing pressure control device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In order to overcome the problems of large manual workload and low efficiency in oil well casing pressure control in existing crude oil production, and the inability to realize automatic control of casing pressure, this embodiment provides a method such as figure 1 and figure 2 The shown oil well casing pressure control device includes a valve body 1, a pressure cap 2 is connected to the inside of the front end of the valve body 1, and a ball seat 3, a cut-off steel ball 4 and a steel ball push rod 5 are set inside the valve body 1, The ball seat 3 is connected with the pressure cap 2, the cut-off steel ball 4 is placed between the ball seat 3 and the steel ball push rod 5, and the inner side of the steel ball push rod 5 is set with a pressure regulating valve 7. A pressure regulating spring 6 is sleeved on the outside of the pressure valve 7, and the pressure regulating spring 6 is connected to the steel ball push rod 5. A tail cap 8 is connected to the outside of the...

Embodiment 2

[0021] This embodiment provides an oil well casing pressure control device, which includes a valve body 1, a pressure cap 2 is connected to the inside of the front end of the valve body 1, and a ball seat 3, a cut-off steel ball 4 and a steel ball are set inside the valve body 1. The push rod 5, the ball seat 3 is connected with the pressure cap 2, the cut-off steel ball 4 is placed between the ball seat 3 and the steel ball push rod 5, and the inside of the steel ball push rod 5 is set with a pressure regulating valve 7 , the outside of the pressure regulating valve 7 is sleeved with a pressure regulating spring 6, the pressure regulating spring 6 is connected with the steel ball push rod 5, and the outside of the tail of the valve body 1 is connected with a tail cap 8, and the tail cap 8 is a A pressure regulating interface 9 is connected to the side wall, and the pressure regulating interface 9 communicates with the pressure regulating chamber 15 of the valve body 1, and the...

Embodiment 3

[0024] This embodiment provides an oil well casing pressure control device, which includes a valve body 1, a pressure cap 2 is connected to the inside of the front end of the valve body 1, and a ball seat 3, a cut-off steel ball 4 and a steel ball are set inside the valve body 1. The push rod 5, the ball seat 3 is connected with the pressure cap 2, the cut-off steel ball 4 is placed between the ball seat 3 and the steel ball push rod 5, and the inside of the steel ball push rod 5 is set with a pressure regulating valve 7 , the outside of the pressure regulating valve 7 is sleeved with a pressure regulating spring 6, the pressure regulating spring 6 is connected with the steel ball push rod 5, and the outside of the tail of the valve body 1 is connected with a tail cap 8, and the tail cap 8 is a A pressure regulating interface 9 is connected to the side wall, and the pressure regulating interface 9 communicates with the pressure regulating chamber 15 of the valve body 1, and the...

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Abstract

The invention belongs to the technical field of oil production engineering and particularly provides an oil well casing pressure control device. The oil well casing pressure control device comprises a valve body, wherein a pressure cap is connected with the inner side of the front end of the valve body; a ball seat, a stop steel ball and a steel ball push rod are mounted inside the valve body in a sleeving manner; the ball seat is connected with the pressure cap; the stop steel ball is arranged between the ball seat and the steel ball push rod; a pressure regulating valve is mounted on the inner side of the steel ball push rod in a sleeving manner; a pressure regulating spring is connected with the outer side of the pressure regulating valve in a sleeving manner; the pressure regulating spring is connected with the steel ball push rod; the outside of the tail part of the valve body is connected with a tail cap; one side wall of the tail cap is connected with a pressure regulating connector; the pressure regulating connector is communicated with a pressure regulating cavity of the valve body; the valve body between the stop steel ball and the pressure regulating valve is provided with an exhaust connector. According to the oil well casing pressure control device, an opening pressure of the stop steel ball is regulated by the pressure regulating connector; automatic control on a casing pressure is realized; the problem of large labor workload of controlling the casing pressure of an oil well is solved; oil pumping efficiency and system efficiency are improved; meanwhile, associated gas can be recovered; emission is eliminated; and environmental pollution and potential safety hazards are reduced.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to an oil well casing pressure control device. Background technique [0002] A large amount of natural gas dissolved in formation oil reservoirs under high temperature and pressure is called dissolved gas. In crude oil production, dissolved gas is the main driving force for oil displacement, relying on the expansion and separation of gas to drive crude oil from formation pores to production wells. As the fluid enters the production well, the pressure gradually decreases, and the dissolved gas gradually separates from the crude oil into free gas, which expands slowly until it leaves the crude oil and enters the annular space of the oil casing. This part of the gas is casing gas. [0003] However, if the gas pressure control of the casing is unreasonable or the gas is opened, it will not only reduce the filling coefficient of the oil well pump, produce ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/06
CPCE21B34/06
Inventor 覃川薛建强王林平郑刚魏立军王曼崔斌程颢晏耿成冯建设
Owner PETROCHINA CO LTD
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