一种耐盐速溶海水基压裂液体系的研发及评价

Development and Evaluation of a Salt-Tolerant Instant Seawater-Based Fracturing Fluid System

开发适合海上油气藏的海水基压裂液体系是降低海上压裂施工成本、提高压裂施工效率和压裂规模的关键技术,通过平板聚合工艺合成了高分子速溶海水基稠化剂,建立了耐高温140℃的海水基压裂液体系。在140℃、170 s^(-1)下剪切2 h后压裂液黏度为78 mPa·s,破胶后黏度变为3.5 mPa·s,表面张力为25.38 mN/m,破胶液与煤油界面张力1.7 mN/m,平均残渣含量为70.75 mg/L,海水基压裂液各项指标满足现场应用的要求。

Research and development of the seawater-based fracturing fluid system is the key technology to reduce the cost of offshore fracturing construction,improve the construction efficiency and fracturing scale.A polymer instant seawater-based viscosifier was synthesized by the plate polymerization process,and the seawater-based fracturing fluid system with a temperature resistance of 140℃was established.The viscosity of fracturing fluid was 78 mPa·s after shearing for 2 h at 140℃and 170 s^(-1).After breaking,the viscosity changed to 3.5 mPa·s,the surface tension was 25.38 mN/m,the interfacial tension between the breaker and kerosene was 1.7 mN/m,and the average residue content was 70.75 mg/L.All indexes of fracturing fluid meet the requirements of field application.