油气田高温高盐储层缓蚀阻垢复合剂及其制备方法
The composite agent, composed of a four-arm branched water-soluble terpolymer and a long-chain alkyl imidazoline quaternary ammonium salt, solves the problems of insufficient temperature resistance and polymer instability of scale inhibitors under high temperature and high salt conditions in the existing technology, and achieves a highly efficient integrated scale inhibition and corrosion inhibition effect, meeting the long-term protection requirements of deep well injection and production systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XI'AN PETROLEUM UNIVERSITY
- Filing Date
- 2026-05-12
- Publication Date
- 2026-07-17
AI Technical Summary
Under high temperature and high salinity coupled conditions, existing oilfield chemicals suffer from insufficient temperature resistance due to the β-fracture of the main chain in linear polymer scale inhibitors. Furthermore, the physical mixing of polymers and imidazoline corrosion inhibitors lacks synergistic effects, and the phosphonic acid group density is insufficient. Consequently, the polymers become unstable in high salinity media, making it impossible to achieve long-term scale and corrosion protection for deep well injection and production systems.
A composite agent composed of a four-arm branched water-soluble terpolymer and a long-chain alkyl imidazoline quaternary ammonium salt is used to form an ion-pair complex through coulombic interaction, forming a dense hydrophobic corrosion inhibitor film at the metal interface. The three-stage synergistic mechanism achieves integrated scale inhibition and corrosion inhibition, and the polymer remains stable under high temperature and high salt conditions.
Under operating conditions of 180°C and 200,000 mg/L, the composite agent achieves a scale inhibition rate of over 90% for CaCO3 and BaSO4, a corrosion inhibition rate of over 85% for carbon steel N80, and an integrated corrosion inhibition and scale inhibition synergy index of over 1.2, enabling 14 days of continuous protection for deep well injection and production systems.
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Figure CN122187270B_ABST