Preparation method and application of water-resistant anti-swelling agent

The water-resistant anti-swelling agent prepared by raw materials such as terephthaldehyde, N-methylethylenediamine and glycidol uses the electrostatic and hydrogen bonding effects of quaternary ammonium salts and hydroxyl groups to interact with bentonite to solve the traditional anti-swelling The lack of performance of the agent at high temperature and water washing has been achieved, and the anti-swelling agent that maintains good anti-swelling performance and water washing resistance at high temperatures is achieved.

CN118894987BActive Publication Date: 2025-01-17东营江源化工有限公司
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Patent Information

Application Number
CN202411399768.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-09
Publication Date
2025-01-17
Estimated Expiration
2044-10-09

AI Technical Summary

Technical Problem

Traditional clay anti-swelling agents have poor temperature resistance and poor water washing resistance in high-temperature oil and gas mining, which cannot effectively solve the problems of instability and expansion of the well wall of the oil and gas reservoir.

Method used

Intermediate A is generated by reacting terephthaldehyde with N-methylethylenediamine, then reacting with glycidol to form intermediate B, and finally undergoing quaternization polymerization with dibromoles to prepare a water-resistant anti-swelling agent. The main chain of the expander molecule contains quaternary ammonium salt functional groups and hydroxyl groups, which can form strong electrostatic and hydrogen bond interactions with bentonite, improve anti-swelling performance, and enhance high temperature resistance through a rigid benzene ring structure.

Benefits of technology

The water-resistant anti-swelling agent maintains good anti-swelling and structural stability at high temperatures, and is firmly adsorbed on the bentonite surface through electrostatic and hydrogen bonding, which significantly improves the water-resistant washing and anti-swelling performance. It is suitable for deep wells and ultra-deep wells Oil and gas mining.

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Abstract

The invention belongs to the technical field of oilfield exploitation, and discloses a preparation method and application of a water-washable anti-swelling agent, wherein the present invention conducts Schiff base reaction to terephthalaldehyde and N-methylethylenediamine, and then conducts ring-opening reaction with glycidol to obtain an intermediate B containing a tertiary amine group, and finally conducts quaternization polymerization reaction with dibromoalkanes such as 1,2-dibromoethane to obtain a water-washable anti-swelling agent. Its main chain contains a large amount of quaternary ammonium salt functional groups, and the side chain contains a large amount of hydroxyl groups, and forms static electricity with the surface of bentonite silicate, and hydrogen bonds and the like interact, and both have strong adsorption and interaction forces, so that the anti-swelling agent can well exclude water molecules between bentonite crystal layers, and at the same time, it is difficult for bentonite to adsorb hydrated cations and expand, thereby showing excellent anti-swelling effect. And the anti-swelling agent has good high temperature resistance and water-washing resistance.
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Citation Information

Patent Citations

  • Multi-quaternary ammonium salt long-acting slow-release anti-swelling agent and preparation method thereof

    CN117720482A

  • Preparation method of high temperature clay stabilizer for oil fields

    CN109054798A

  • Environment-friendly clay stabilizer

    CN109554171A