大庆石油地质与开发2025，Vol.44Issue(2)：79-88,10.DOI:10.19597/J.ISSN.1000-3754.202310010
高温碳酸盐岩储层酸压固态延迟酸在裂缝中作用规律数值模拟
Numerical simulation of solid-delayed acid behavior in fractures of high-temperature carbonate reservoir acid fracturing
摘要
Abstract
Acid fracturing is a main stimulation method for low-permeability carbonate reservoirs.Conventional acid has short action distance in high-temperature carbonate reservoirs,so self-generated acid is often used to increase acid fluid action distance.Solid-delayed acid in self-generated acid is widely used in oilfields,but lack of simula-tion and research on solid-delayed acid behavior considering temperature impact.Aiming at this problem,a model for solid-delayed acid generation is firstly established.Secondly,a model of solid-delayed acid action in acid frac-turing is constructed based on principles of conservation of matter,conservation of energy,conservation of momen-tum and kinetics of acid-rock reaction.Lastly,numerical solution method is used in programming for simulation cal-culation.The results show that,generated acid concentration of solid-delayed acid reaches 11.4%(mass fraction)of pure HCl in non-reaction condition,and is about 6%(mass fraction)of pure HCl in flowing and reaction condition in fractures.Filtration and cooling in near-well zone(40 m away from well)cause significant variation of acid etched fracture width.For middle-deep fractures,whether or not consider heat generation of acid-rock reaction result in maximum acid temperature difference of 40℃.Compared to cross-linked acid,solid-delayed acid has the advan-tage of slow release and increasing the distance of active acid action.With typical combination of operation condi-tions,predicted distance of solid-delayed acid action can reach 140～180 m.The research provides theoretical ba-sis for application of solid-delayed acid in acid fracturing of high-temperature carbonate reservoirs.关键词
固态延迟酸/生酸规律/裂缝温度场/建模/酸压/活酸作用距离/碳酸盐岩储层Key words
solid-delayed acid/acid generation behavior/fracture temperature field/modeling/acid fracturing/active acid action distance/carbonate reservoir分类
石油、天然气工程引用本文复制引用
罗攀登,张士诚,张雄,牟建业,郑海钱,卢盼盼..高温碳酸盐岩储层酸压固态延迟酸在裂缝中作用规律数值模拟[J].大庆石油地质与开发,2025,44(2):79-88,10.基金项目
中国石油化工股份有限公司西北油田分公司重大科技项目"顺北稳产力学基础研究"(34400007-22-ZC0607-0056). （34400007-22-ZC0607-0056）
