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A downhole 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, complicated maintenance or replacement operations, time-consuming and labor-intensive, etc., and achieve low cost, easy operation, and avoid sealing. The effect of blocking time

Active Publication Date: 2022-01-11
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

Method used

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  • A downhole 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 accompanying drawings and through specific implementation methods.

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

[0034] like figure 1 Sh...

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Abstract

The invention belongs to the technical field of oil and gas field development, and discloses a downhole control pipeline plugging process and system. The downhole control pipeline plugging process includes the following steps: record the casing pressure and tubing pressure in the oil well casing; determine that the uphole control pipeline is normal, and then inject at least twice the downhole control pipeline into the downhole control pipeline with a pressure higher than the casing pressure; measure the leakage rate of the working medium; release the pressure of the downhole control pipeline, and calculate the depth of the leakage point according to the volume of the returning working medium; inject plugging agent into the downhole control pipeline; inject working fluid into the downhole control pipeline The medium pushes the plugging agent to the point of the leak. The invention injects the leak-stopping agent into the downhole control pipeline, and the leak-stopping agent gradually polymerizes from the edge of the leak point to the middle under the action of the pressure difference to form a solid with a certain degree of flexibility to block the leak point, which is easy to operate, low in cost, and capable of Timely plugging to avoid a great impact on the normal production of oil and gas wells.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an underground control pipeline plugging process and system. Background technique [0002] Offshore oil and gas well completion production strings include oil and gas pipes and downhole safety valves arranged on the oil and gas pipes. The oil and gas pipes are arranged in the oil well casings. The control pipelines of the downhole safety valves are located between the oil and gas pipes and the oil well casings and extend to the ground. The ground control system controls the opening or closing of the downhole safety valve through hydraulic pressure. [0003] During the working process, the hydraulic control pipeline is prone to damage or rupture under special vibration or external force environment, resulting in the leakage of the working medium (such as oil) inside the hydraulic control pipeline, making the control system unable to control the normal operati...

Claims

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Application Information

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Patent Type & Authority Patents(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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