Fracturing biological gel breaking enzyme protective agent, preparation method and fracturing fluid system

CN122104661APending Publication Date: 2026-05-29CNPC BOHAI DRILLING ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNPC BOHAI DRILLING ENG
Filing Date
2024-11-28
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Bio-enzyme breaker has poor stability in complex field operation environments and is easily affected by factors that lead to deactivation, thus affecting the effectiveness of fracturing fluid and reservoir stimulation.

Method used

A fracturing fluid system was prepared by using a bio-enzyme protectant composed of ascorbic acid, sucrose, sorbitol, glycerol, glutamic acid, histidine, and aspartic acid, which was combined with a bio-enzyme breaker to improve the stability and activity of the enzyme.

Benefits of technology

It extends the effective action time of biological enzymes, improves the stability of enzyme preparations, ensures that enzymes maintain activity in complex environments, meets the needs of reservoir stimulation construction, and reduces the risk of reservoir damage.

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Abstract

The application belongs to the technical field of oil exploitation, and particularly relates to a biological gel breaking enzyme protective agent for fracturing, a preparation method thereof and a fracturing fluid system. The biological gel breaking enzyme protective agent for fracturing comprises the following raw material components in parts by weight: ascorbic acid 0.2-0.4 parts, sucrose 0.2-0.4 parts, sorbitol 0.4-0.6 parts, glycerol 0.01-0.03 parts, glutamic acid 0.1-0.3 parts, histidine 0.1-0.3 parts, aspartic acid 0.1-0.3 parts, and the rest is buffer; and the total weight of the raw material parts is 100. The biological gel breaking enzyme protective agent for fracturing can greatly prolong the effective action time of the biological gel breaking enzyme, improve the poor stability of the biological enzyme preparation, and solve the problem that the biological enzyme preparation is easily affected by fluctuations to cause inactivation. The biological gel breaking enzyme protective agent for fracturing has good compatibility with the rest components of the fracturing fluid system, the biological enzyme can maintain activity even under limited field operation conditions, and the demand of reservoir reconstruction construction can be met.
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