页岩气藏水平井拟稳态产能研究及影响因素分析  

Productivity research and analysis of influential factors on quasi steady horizontal wells in shale gas reserviors

作　　者：周培尧 郭文[1] 喻鹏[2] 崔金榜[2] 张广海 

机构地区：[1]西安石油大学CNPC油藏改造重点实验室,陕西西安710065 [2]中国石油天然气股份有限公司华北油田分公司,山西长治046000 [3]中国石油集团渤海钻探工程有限公司,天津300457

出　　处：《石油化工应用》2014年第10期10-14,共5页Petrochemical Industry Application

基　　金：国家自然科学基金项目;项目编号:51274164;中国石油天然气股份有限公司科学研究与技术开发项目;项目编号:2011D-5008-05

摘　　要：页岩气是赋存于富有基质泥页岩及夹层中,以吸附和游离状态为主要存在方式的非常规天然气。页岩气储量巨大,开发前景被业内广为看好,但其低孔低渗特性使得开发难度高于常规气藏。水平井分段压裂技术开发页岩气已成为世界趋势,但由于页岩气在页岩基质和人工裂缝中呈赋存状态,且独有的渗流特性,压裂在储层内部形成的复杂裂缝网络,使其产能分析较为复杂。以常规压裂机理为基础,利用水平井特定生产指数,考虑页岩气朗格缪尔解吸附作用,建立水平井体积压裂拟稳态产能模型,完整推导了拟稳态流下页岩水平井裂缝产能公式,并对影响产能的因素作出具体分析。对于我国页岩气开发中的适应性问题及页岩压裂特点的裂缝扩展和产能预测具有重要的理论指导意义。Shale gas is located in the rich matrix shale and interlayer, and it exists unconventional natural gas which has the main mode of adsorption and the free state.Shale gas has vast reserves,and its prospects were widely optimistic in the industry, but its low porosity and low permeability characteristics make the development difficulty highly conventional gas reservoir.The horizontal well fracturing technology is used to develop shale gas,which has become a worldwide tendency.However,the shale gas is occurrence in shale matrix and artificial cracks.It owns seepage characteristics and unique,complex fracture network formed in the reservoir fracturing make its capacity analysis of more complex.Based on conventional fracturing mechanism,the author uses horizontal well specific production index,considers the desorption of Langmuir, establish the productivity model of volume in pseudo steady state of horizontal well fracturing, completes derivation of quasi cracks shale horizontal well productivity formula of steady state flow,and makes a concrete analysis on the influence factors of productivity.It has important theoretical guiding significance to crack propagation and productivity prediction in shale fracturing characteristics and the adaptive problems in the development of our country.

关 键 词：页岩气 拟稳态 压裂水平井 模拟计算 

分 类 号：TE319[石油与天然气工程—油气田开发工程]