Development and application of synthetic-based drilling fluid filter cake removal fluid system

doi:10.3969/j.issn.1006-6535.2025.05.018

Abstract

Abstract: To address the problem that the filter cake formed by synthetic-based drilling fluid in the near-wellbore zone is difficult to remove, thus causing damage to the reservoir, a filter cake removal fluid was developed based on the composition of the synthetic-based drilling fluid filter cake, and the fluid is formulated with retarded acid HWCP, corrosion inhibitor HWCI, cleaning penetrant JFC, and waterproof lock agent HSSJ. The filter cake removal ability and reservoir protection ability of the filter cake removal fluid system were evaluated. The study shows that the weight loss rate of the synthetic-based drilling fluid API filter cake reached 90.97% after being soaked at 90 ℃ for 3 hours. After injecting the filter cake removal fluid into cores contaminated by synthetic-based drilling fluid, the permeability recovery value was 96.98%. This system has good filter cake removal performance and reservoir protection ability, effectively reducing the damage degree of synthetic-based drilling fluid to the reservoir. Field applications have demonstrated that this system achieves effective well stimulation and enhanced production performance. This research can provide reference for protecting reservoirs in western South China Sea oilfields and improving the comprehensive economic benefits of similar oilfields.

Key words: synthetic-based drilling fluid, filter cake removal, reservoir protection, permeability, western South China Sea Oilfield

CLC Number:

TE254

HU Youlin, ZHENG Jinlong, LIU Gaohua, DENG Wenbiao, LI Qiang, YUE Qiansheng. Development and application of synthetic-based drilling fluid filter cake removal fluid system[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 153-158.

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