Temperature-resistant and salt-resistant foaming agent for drilling and synthesis method thereof

By preparing a drilling foaming agent with bicationic and tetraanionic amphoteric surfactants, the problems of foaming and foam stabilization under high temperature and high salinity formation conditions were solved, achieving high-efficiency drilling fluid foaming performance and improving the safety and efficiency of drilling operations.

CN117069625BActive Publication Date: 2026-01-27DONGYING SPRING PETROLEUM ENG TECH
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Patent Information

Application Number
CN202311036034.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-17
Publication Date
2026-01-27
Estimated Expiration
2043-08-17

AI Technical Summary

Technical Problem

Existing drilling foaming agents have poor foaming and foam stabilization properties under high temperature, high salinity and high hardness formation conditions, which makes it difficult to meet the field requirements and affects drilling efficiency and safety.

Method used

The drilling foaming agent, which uses a bicationic and tetraanionic amphoteric surfactant, is prepared through a specific chemical synthesis method. It forms a molecular structure with four sulfonic acid groups and two quaternary ammonium salts, thereby improving surface activity and temperature and salt resistance.

Benefits of technology

It achieves good foaming and foam stabilization performance under high temperature and high salinity conditions, with large foam volume, long foam half-life, low surface tension and interfacial tension, and low critical micelle concentration, making it suitable for use in drilling fluids.

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Abstract

The application belongs to the technical field of oil and gas field development, and particularly relates to a temperature-resistant and salt-resistant foaming agent for drilling and a synthesis method thereof. The synthesis method is as follows: diphenylamine-4-sodium sulfonate, isopropyl alcohol and 1,3-dibromopropane are added into a four-necked flask, stirred, heated and refluxed to obtain a mixed solution; 90-95wt% of isopropyl alcohol in the mixed solution is distilled off under reduced pressure, distilled water is added, and the whole is transferred into a separatory funnel, fully shaken, separated, and a small amount of oil phase is discarded; the pH is adjusted to 2-3, a precipitate is separated out, suction filtration is performed, and an intermediate is obtained; the intermediate is transferred into a four-necked flask with isopropyl alcohol, sodium bromoethyl sulfonate is added, the pH is adjusted to 7-8, and the product solution is obtained by heating and refluxing; the product is obtained by vacuum distillation, recrystallization and drying. The foaming agent for drilling has the advantages of good temperature resistance, salt resistance and salinity resistance.
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