A high-temperature oil and gas well barite chelation plug remover composition, and a preparation method and use method thereof

CN118620589BActive Publication Date: 2026-07-03CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2023-03-07
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing barite unblocking agents have insufficient solubility in high-temperature deep wells and pose environmental safety hazards. They cannot effectively remove barite blockages, affecting oil and gas well production and recovery rates.

Method used

Using diethylenetriaminepentaacetic acid as the main chelating agent, supplemented with potassium hydroxide as a pH adjuster, and adding moisture-proof and anti-caking agents, a barite chelating unblocking agent for high-temperature oil and gas wells was prepared. The dissolution efficiency was improved by a stepwise injection process, and potassium aminopolycarboxylate salts were generated to enhance the dissolution capacity.

Benefits of technology

It achieves efficient removal of barite blockage at high temperatures of 80℃-180℃, improving oil and gas well production and recovery rate. The product has good stability, high cost performance, and is suitable for high-temperature deep wells.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a high-temperature oil and gas well barite chelation plug-removing agent composition and a preparation method and use method thereof, and belongs to the field of special chemicals used for removing barite plugs during drilling, well completion, reservoir reconstruction and other construction operations in order to improve oil and gas production in oil and gas fields. The high-temperature oil and gas well barite chelation plug-removing agent composition of the application takes diethylenetriamine pentaacetic acid as a main chelating agent component, takes potassium hydroxide as a pH regulator, and is supplemented with ethylenediaminetetraacetic acid, nitrilotriacetic acid and other synergistic agents, adds a moisture-proof agent and an anti-caking agent as an auxiliary agent, and the prepared solid product has high effective content, simple production process, convenient storage and transportation, and when used, a solution is prepared, in a suitable pH range, barite plugs can be efficiently removed, oil and gas well production and recovery efficiency can be improved, and the barite plug-removing agent can be used for dissolving and removing barite plugs in a deep well high-temperature environment.
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