Sulfonated crown ether-lignin copolymer and application thereof in drilling fluid viscosity reducer
The use of sulfonated crown ether-lignin copolymers has solved the problems of low viscosity reduction efficiency and high-temperature degradation of drilling fluids under high salinity and high temperature conditions, thus achieving high-temperature stability and long-term use of drilling fluids.
CN122145729APending Publication Date: 2026-06-05SINOPEC OILFIELD SERVICE CORPORATION +2
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Patent Information
- Application Number
- CN202411770890.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2026-06-05
AI Technical Summary
Technical Problem
Existing drilling fluid viscosity reducers have low viscosity reduction efficiency under high salinity and high temperature conditions, and also suffer from high-temperature degradation and chain breakage.
Method used
Sulfonated crown ether-lignin copolymer is used as a drilling fluid viscosity reducer. The crown ether is combined with lignin through the Mannich reaction and then sulfonated to form a copolymer with chelating effect and high temperature stability.
Benefits of technology
It improves the drilling fluid's resistance to divalent salts and temperature, ensuring it does not degrade at high temperatures and extending its service life.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention belongs to the technical field of drilling fluid viscosity reducers, and particularly relates to a sulfonated crown ether-lignin copolymer and application thereof to a drilling fluid viscosity reducer. The preparation method of the sulfonated crown ether-lignin copolymer comprises the step that sulfonated crown ether-lignin, propylene sulfonate and allyl polyethylene glycol react in the presence of an initiator to obtain the sulfonated crown ether-lignin copolymer. The preparation method comprises the following steps: firstly, combining aza-crown ether with lignin through aldehyde through Mannich reaction, then sulfonating crown ether-lignin by adopting sulfite, and finally carrying out copolymerization reaction with propylene sulfonate and allyl polyethylene glycol to finally form the sulfonated crown ether-lignin copolymer. The copolymer can improve the chelating effect of a system on calcium ions, is good in high-temperature stability, can greatly improve the divalent salt resistance and temperature resistance of the filtrate reducer, can resist 8.0 wt% of CaCl2, and can resist the temperature of 240 DEG C.
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