一种自生热耐高温高密度压裂液体系研究

深水、超深井储层埋藏深度大，地层破裂压力高，压开地层难度大，对压裂设备和管柱的承压要求很高，造成深水油气田压裂作业施工压力高、风险大，同时海上平台或作业支持船空间有限，难以装备大型压裂设备进行压裂施工。为了尽量减小施工规模，降低井口注入压力，研究了一种自生热耐高温高密度压裂液体系，并对该压裂液体系进行室内性能评价与现场摩阻测试。实验结果表明，该压裂液体系密度达到1.5 g/cm3，降阻率达到59.6%以上，能够耐温140 ℃。自生热体系的引入缩短了压裂液破胶时间，产生的气体能促进压裂液破胶后返排。

Research on an autogenetic heat and high temperature resistant fracturing fluid systemwith high-density

For deeply buried and high formation fracturing pressure of deep water ultra deep reservoir, it is difficult to break the rock stratum and the pressure-bearing requirements for fracturing equipment and pipe strings are extremely high. So fracturing operation in deep water reservoir always faces high construction pressure and high risk, meanwhile, the limited space makes it difficult to equip large fracturing equipment on offshore platforms or operating support vessels. In order to minimize the construction scale, reduce wellhead injection pressure, this paper discussed an autogenetic heat and high temperature resistant high-density fracturing fluid system, and then performance evaluation in the laboratory and in-situ friction measurement were conducted for this new fracturing fluid system. The experiment results show that the density of fracturing fluid was 1.5 g/cm3, and friction reducing rate can reach to 59.6% with temperature resistant of 140 ℃.Introduction of autogenetic-heat system has greatly shortened the breaking time of fluid and the associated gas could promote fracturing fluid flowback after gel breaking.