水基压裂液对储层液相伤害的实验研究

Experimental study on damage of water-based fracturing fluid to reservoir liquid phase

 曹彦超¹ 曲占庆¹ 许华儒¹ 郭天魁¹ 杨升光² 龚迪光³

中国石油大学（华东）石油工程学院，山东 青岛 266580 长城钻探工程有限公司压裂公司，辽宁 盘锦 124010 西安石油大学石油工程学院，陕西 西安 710065）

College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China Fracturing Service Company, Great Wall Drilling Company Ltd., CNPC, Panjin 124010, China School of Petroleum Engineering, Xi′an Shiyou University, Xi′an 710065, China)

 文中从微观角度系统分析了压裂液对储层造成的水敏伤害与水锁伤害，并且将核磁共振分析技术应用于压裂液对储层液相伤害的研究领域，与常规流动实验相结合，提出了一套评价压裂液对储层伤害的实验方法，建立了每种伤害机理与伤害程度间的对应关系。实验结果表明，压裂液滤液渗入储层后均会不同程度地造成束缚水增加、可动水滞留，从而引起储层渗透率降低，造成储层液相伤害，并且，对于不同渗透性储层其伤害程度不同，通过增大返排量和加入表面活性剂的措施可以使液相伤害得到一定程度的缓解。研究成果对压裂液性能优化及油井压裂改造，将具有重要指导意义。

 In this paper, the damage of water sensitivity and water locking caused by fracturing fluid to reservoir is analyzed from the microscopic point, and the nuclear magnetic resonance analysis technique is applied to fracturing fluid damage to the reservoir liquid phase. Combined with conventional flow experiments, an experimental method of evaluating the damage of fracturing fluid to reservoir is put forward, and the relationship between the damage mechanism and the degree of damage is established. The experiment results show that the fracturing fluid filtrate into the reservoir will cause different degrees of bound water and movable water retention, which will reduce the permeability of reservoir and result in the reservoir liquid phase damage. Moreover, the damages of different permeability reservoirs are unlike, which can be relieved by increasing the addition of return flow and injecting surface active agent. This study will provide some guiding to fracturing fluid optimization and oil well fracturing.

10.6056/dkyqt201605030