摘要
为深入了解页岩储层支撑裂缝导流能力的大小及裂缝有效性,开展了支撑剂粒径、类型、铺置方式对导流能力影响的实验研究,并进行了循环应力加载模拟开、关井过程引起的地层应力波动对页岩储层导流能力影响的实验研究。结果表明:低闭合压力下,粒径越大,导流能力越高,随着闭合压力的增大,大粒径支撑剂导流能力下降迅速;支撑剂均匀铺置与完全混合铺置相比,前者导流能力较好;开、关井过程引起的地层应力波动对页岩导流能力的影响较大。以上因素的研究对压裂方案设计优化和现场施工具有一定的理论指导意义。
In order to understand the flow conductivity and effectiveness of the shale formation′ s propped fracture, the effects of proppant types, sizes and different arrangement modes on flow conductivity were studied. Besides, cyclic stress loading test is firstly done in this study to simulate the influence of the reservoir stress fluctuation on the fracture conductivity caused by well startup and well off. Experimental results show that the flow conductivity grows with particle size increasing under low closure stress; as the closure stress increases, the flow conductivity of proppant with large particle size decreases sharply; compared with the condition that proppants are totally mixed and laid, the flow conductivity is better when the proppants are uniformly laid; in shale formation, the reservoir stress fluctuation caused by well startup and well off in procedure has great effect on the flow conductivity. The study of these factors has guiding significance on the design of fracturing and site operation.
出处
《断块油气田》
CAS
北大核心
2016年第1期133-136,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项"大型油气田及煤层气开发"课题"页岩气储层增产改造技术"(2012ZX05018-004)
关键词
压裂
支撑剂
导流能力
地层应力波动
导流实验
fracturing
proppant
flow conductivity
reservoir stress fluctuation
flow experiment
