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Underground control pipeline plugging process and system

A technology for controlling systems and pipelines, applied in wellbore/well components, surveying, earth-moving drilling, etc., can solve the problems of high cost, time-consuming and laborious, complicated maintenance or replacement operations, etc., to achieve low cost, avoid plugging opportunities, Easy-to-use effects

Active Publication Date: 2019-05-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a downhole control pipeline plugging process and system to solve the problems in the prior art that when the hydraulic control pipeline leaks, the maintenance or replacement operation is complicated, time-consuming and laborious, and the cost is high

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  • Underground control pipeline plugging process and system
  • Underground control pipeline plugging process and system

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Embodiment Construction

[0032] The technical solutions of the present invention will be further described below in conjunction with the drawings and specific implementations.

[0033] This embodiment provides a downhole control pipeline plugging process, mainly for downhole control pipelines (hydraulic control pipelines) that use hydraulic control tools (downhole safety valves, etc.) in oil and gas wells. When the downhole control pipeline leaks, plugging is used The agent seals the leak point of the downhole control pipeline, and of course it can also be used to seal the leak point of other hydraulic control pipelines. Among them, the plugging agent is liquid, and there is a pressure difference at the leakage point. Under the action of the pressure difference, the liquid molecules of the plugging agent aggregate and form a solid plug with a certain degree of flexibility, which gradually accumulates from the edge of the leakage point to the center. Finally seal the leak

[0034] Such as figure 1 Shown is...

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Abstract

The invention belongs to the technical field of oil and gas field development, and discloses an underground control pipeline plugging process and system. The underground control pipeline plugging process comprises the following steps that recording the casing pressure and the oil pipe pressure in an oil well casing; determining that an aboveground control pipeline is normal, then injecting a working medium which is at least two times of the volume of a underground control pipeline into the underground control pipeline at a pressure higher than the casing pressure, and determining the leakage speed of the working medium; decompressing the underground control pipeline, and calculating the depth of a leakage point according to the volume of the backflow working medium; injecting a plugging agent into the underground control pipeline; and injecting the working medium into the underground control pipeline to push the plugging agent to the leakage point. By injecting the plugging agent intothe underground control pipeline, the plugging agent is gradually polymerized from the edge of the leakage point to the middle under the action of the pressure difference to form a solid with certainflexibility to plug the leakage point, the operation is simple and convenient, the cost is low, timely plugging can be realized, and great influence on normal production of an oil and gas well is avoided.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a downhole control pipeline plugging process and system. Background technique [0002] The offshore oil and gas well completion production string includes an oil and gas pipe and a downhole safety valve arranged on the oil and gas pipe. The oil and gas pipe is arranged in the oil well casing. The control line of the downhole safety valve is located between the oil and gas pipe and the oil well casing and extends to the ground. The surface control system hydraulically controls the opening or closing of the downhole safety valve. [0003] In the working process, the hydraulic control pipeline is prone to damage or rupture under special vibration or external force environment, causing the working medium (such as oil) inside the hydraulic control pipeline to leak, making the control system unable to control the downhole safety valve through the hydraulic control pipeli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/10E21B47/10
Inventor 李艳飞葛俊瑞李三喜罗勇蔡斌吴健黄伟
Owner CHINA NAT OFFSHORE OIL CORP
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