页岩储层水力压裂优化设计.pdf

第32卷增刊2010年11月石 油 钻 采 工 艺OIL DRILLING & PRODUCTION TECHNOLOGYVol. 32 . 2010文章编号:1000 – 7393(2010 ) S0 – 0130 – 03页岩储层水力压裂优化设计杜林麟春兰王玉艳刘丽雯向斌((北京)有限公司,北京海淀100083;,四川成都610017;,浙江杭州310023)摘要:含气页岩由间隙气和吸附气组成,水力压裂是提高这类储层有效动用的唯一手段。本文在分析研究页岩储层特征的基础上,对适合于页岩的水力压裂模型和工艺参数优化进行了分析研究。页岩储层天然裂缝和层理发育,储层流体主要是在层理及天然裂缝系统中进行,针对砂泥岩地层的水力压裂数值模型(包括全三维模型)不适用于页岩储层水力压裂分析。DFN离散裂缝压裂模型是基于连续均匀介质和多孔不连续非均匀介质力学理论的3D压裂数值模型,可用于模拟页岩和煤岩水力压裂中多裂缝、非对称缝和不连续缝,也可用于天然裂缝和断层发育地层中的不连续缝的模拟。在压裂工艺方面,对射孔方式、压裂液、支撑剂等进行了优选。研究结果也可用于裂缝性砂岩储层改造。关键词:页岩;缝网压裂;同步压裂中图分类号::AHydraulic fracturing optimization for shale reservoirsDU Linlin, CHUN Lan, WANG Yuyan, LIU Liwen, XIANG Bin((Beijing).,Beijing100083,China;-EfficiencyHydrocarbonDevelopmentDepartmentofSouthwestOil&pany,Petrochina,Chengdu610017,China;,Petrochina,Hangzhou310023,China)Abstract: Gas bearing prises gapping gas and adsorbed gas. Hydraulic fracturing technology is unique approach to en-hance productivity in such reservoirs. On the basis of analysis of shale reservoir properties, this paper introduces hydraulic fracturing model and technical parameters optimization applicable for shale. The study finds that hydraulic fracturing numerical model(including holo-three-dimensional model)specified for sand shale formation is not available for hydraulic fracturing analysis of shale reservoirs because fluid generally flows within beddings and natural fracture system. DFN discrete model, one 3D fracturing numerical model developed based on dynamics theory on continuously homogeneous medium and discontinuously porous inhomogeneous medium, is in-troduced to simulate either multi-fissures, asymetry fissures and discontinuous fissures in hydraulic fracturing of shale and coal-measure rocks or discontinuous fissures in natural fracture and mature fault formations. Meanwhile, casing perforation types, fracturing fluid and proppant are optimized. This finding