A weighted acid for use in oil and gas formation stimulation in oil well operations and a method of preparing the same

CN122104208APending 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
2024-11-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing heavy acid solutions cannot effectively break up formations under ultra-high temperature conditions, and they cause severe corrosion to downhole tubing. The system has poor compatibility and cannot meet the stimulation needs of deep and ultra-deep reservoirs.

Method used

A weighted acid system composed of industrial hydrochloric acid, formic acid, saturated inorganic salt solution, acid thickener, acid corrosion inhibitor, corrosion inhibitor synergist, solubilizer, drainage aid, iron ion stabilizer, and clay stabilizer in a specific ratio is used. A hydrophobic protective film is formed by small molecule corrosion inhibitors such as quinoline quaternary ammonium salt, and a carbide film is formed on the surface of the steel sheet by the corrosion inhibitor synergist, thereby reducing the corrosion rate.

Benefits of technology

Under ultra-high temperature conditions above 200℃, the pipeline friction is reduced and the corrosion risk is significantly reduced, achieving good compatibility of the weighted acid solution and meeting the transformation needs of deep and ultra-deep reservoirs.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The application discloses a weighted acid for increasing production of oil and gas layers in oil well operation and a preparation method thereof, which comprises the following components in mass-volume ratio: industrial hydrochloric acid: 15-62; formic acid: 3-5; inorganic salt saturated solution: 27-73; acid liquid thickening agent: 0.1-0.2; acid liquid corrosion inhibitor: 3-5; corrosion inhibitor synergist: 0.3-0.5; solubilizer: 10-20; cleanup aid: 1-2; iron ion stabilizer: 1-2; clay stabilizer: 1-2; wherein the mass-volume ratio is in g / mL. The weighted acid can be applied to a super-high-temperature environment above 200 DEG C, can reduce pipe friction, can greatly reduce corrosion risk, and is compatible with a weighted acid liquid system, thereby meeting the needs of deep and super-deep reservoir reconstruction and pressure opening of reservoirs.
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