A workover device and method based on homogeneous kill fluid

By using homogeneous kill fluid workover equipment and methods, and utilizing multi-tank design and grinding, the problem of difficult-to-remove bottom blockages has been solved, improving workover quality and efficiency, and ensuring construction safety and progress.

CN122106440APending Publication Date: 2026-05-29PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2024-11-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing well control methods based on well kill hydraulic wells cannot effectively remove blockages at the bottom of the well, resulting in poor well workover results and low construction efficiency. In particular, when there are a large amount of scale and profile control agents at the bottom of the well, conventional operations are prone to problems such as formation loss and casing failure.

Method used

A well workover device and method based on homogeneous kill fluid is adopted. Through multi-storage tank design and pump truck system, kill fluid with uniform density and viscosity is prepared. Combined with grinding and drilling, blockages at the bottom of the well are removed to ensure wellbore unobstructed flow.

Benefits of technology

It improved the quality and efficiency of well repair, solved the problem of the difficulty in completely removing blockages at the bottom of the well, and ensured safety and construction progress under high pressure and high temperature environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the technical field of oil and gas development, and discloses a workover device and method based on homogeneous well killing fluid, wherein the workover method of the workover device based on homogeneous well killing fluid comprises the following steps: preparing homogeneous well killing fluid, preparing spacer fluid, carrying out circulating well killing, carrying out oil pipe lifting operation after successful well killing, then carrying out well passing operation and oil pipe lowering operation, ensuring that the oil pipe is not damaged, and then using well washing fluid to carry out reverse circulation well washing, if the bottom hole plug cannot be discharged, using well killing fluid to carry out drill grinding treatment until the well washing is qualified, connecting water injection well process pipeline, carrying out test injection operation, confirming that the well head is not punctured and not leaked, and then the workover is successful; the present application can completely remove the bottom hole plug, ensure the smoothness of the wellbore, improve the workover quality and efficiency, and solve the problem that under the condition of high injection pressure of the water injection well, the construction efficiency is affected by factors such as formation leakage, test pressure sleeve breaking and the like before carrying out conventional string checking, plugging sidetracking and other downhole operations.
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