不同类型裂缝对气井产能影响  

Effects of different fracture types on gas well productivity

作　　者：熊钰[1] 黄仕林[1] 唐洪明[1] 刘江斌[1] 何锡俊[1] 

机构地区：[1]西南石油大学,四川成都610500

出　　处：《特种油气藏》2011年第4期98-101,140,共4页Special Oil & Gas Reservoirs

基　　金：国家重大科技专项"低渗油气田高效开发钻井优化设计技术研究"(2008ZX05022-001)

摘　　要：在低渗、特低渗气藏开发过程中,裂缝对气井的产能和稳产能力起着主导作用。选取了某低渗气田在不同沉积微相下的含有裂缝的岩心进行了专门的实验研究。详细分析了半充填缝、未充填缝的应力敏感,评价了裂缝宽度随有效应力的变化以及其对产能的贡献差异。实验研究表明:未充填缝的应力敏感性较强,对气井初期产能贡献较大;半充填缝的应力敏感性较弱,对气井中后期产能起主导作用;特低渗气藏产量在很大程度上取决于未充填缝与充填缝的比例。Fractures play a leading role in gas well productivity and rate maintenance capability in the development process of low and ultra-low permeability gas reservoirs.Special experimental study has been conducted with fractured cores of different sedimentary microfacies from a low permeability gas field.Stress sensitivity of semi-filled fractures and unfilled fractures has been analyzed in detail,and the change of fracture width with effective stress and its contribution difference to productivity have been evaluated.The experiment results indicate that unfilled fractures have strong stress sensitivity and contribute more to initial productivity of gas wells,while semi-filled fractures have weak stress sensitivity and contribute more to gas well productivity at middle or later stage.The production of ultra-low permeability gas reservoirs depends to a great extent on the ratio of unfilled to filled fractures.

关 键 词：半充填缝 未充填缝 应力敏感 气井产能 裂缝闭合 

分 类 号：TE311[石油与天然气工程—油气田开发工程] TE32