Cellulose-modified clay stabilizer and method for preparing the same

CN122234243APending Publication Date: 2026-06-19CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing clay stabilizers are not effective in preventing swelling in low- and ultra-low-permeability reservoirs and are harmful to the formation environment. Traditional clay stabilizers are prone to clogging formation pores at high temperatures, affecting permeability and causing negative impacts on the ecological environment.

Method used

Using natural cellulose as raw material, after ultrasonic treatment to reduce the degree of polymerization, cationic groups are grafted into the deoxyglucose ring of microcrystalline cellulose, and K+ is introduced by a complex alkalization reaction to prepare a cellulose-modified clay stabilizer, which improves the adsorption effect with electronegative clay particles.

Benefits of technology

The prepared small-molecule cationic cellulose modified clay stabilizer exhibits good anti-swelling effect in low and ultra-low permeability reservoirs, and is environmentally friendly and low in toxicity, meeting the requirements for field use in oil fields.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a cellulose-modified clay stabilizer and its preparation method. The invention obtains microcrystalline cellulose by treating refined natural fiber cotton with a mixed acid under ultrasonic conditions to reduce the degree of polymerization and crystallinity. Subsequently, potassium (K) is introduced into the cellulose through a composite alkalization process. + Furthermore, cationic groups are grafted onto the deoxyglucose ring of cellulose via a cationic etherification reaction, ultimately yielding a cellulose-modified clay stabilizer with good anti-swelling effect. The cellulose-modified clay stabilizer prepared by this invention has a small molecular weight and high cationicity, enabling effective adsorption with electronegative clay particles. It exhibits significant anti-swelling effect while also possessing the advantages of being green and low in toxicity. Its anti-swelling rate and water washability meet the requirements for general oilfield field use, showing promising application prospects.
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