重复压裂气井造新缝机理研究  

STUDY ON MECHANISM OF INDUCING NEW FRACTURES FOR REFRACTURING GAS WELLS

作　　者：刘洪[1] 赵金洲[1] 胡永全[1] 刘威[2] 胡国恒 李山凤[4] 

机构地区：[1]西南石油学院"油气藏地质及开发工程"国家重点实验 [2]重庆科技学院石油工程系 [3]中国石油吐哈石油勘探开发指挥部地质研究院 [4]中国石油西南油气田分公司重庆气矿

出　　处：《天然气工业》2004年第12期102-104,共3页Natural Gas Industry

基　　金：国家"十五"科技攻关项目"重复压裂工艺研究"(编号 :2 0 0 1BA6 0 5A 0 5 0 2 0 3);"油气藏地质及开发工程"国家重点实验室项目"重复压裂裂缝延伸规律研究"(编号 :PLN 119)部分成果

摘　　要：重复压裂技术是提高低产压裂井产量的有效途径之一。重复压裂新裂缝的重新定向 ,有利于在油气层中打开新的油气流通道 ,更大范围地沟通老裂缝未动用的油气层 ,大幅度地增加油气产量 ,进一步提高油气藏的开发效果 ,因此 ,重复压裂新裂缝的重新定向分析是具有相当难度和应用价值的核心问题 ,也是制约重复压裂优化设计的关键。文章系统地研究了重复压裂井中的应力大小和方向的变化 ,并在此基础上探讨了新缝重定向、重压造新缝机理、重复压裂的最佳时机、新缝延伸规律和缝长特征等问题。现场实践证明 ,该研究成果具有较强的理论依据和实用价值 。Re-fracturing is one of effective approaches to enhance the production of the stripper fractured wells. The re-orientation of the new fractures produced by the re-fracturing favors to open new channels for oil/gas flow, connect oil layers in wider scope, increase oil/gas production greatly and improve recovery results of oil/gas reservoirs further more. The re-orientation analysis of the new fractures produced by the re-fracturing is very difficult and very useful, which is the key to restrict the optimized design of re-fracturing. The variation of stress and its direction in re-fractured wells is studied systematically. Then the re-orientation of the new fractures, the mechanism of inducing new fractures by re-fracturing, the optimum time for re-fracturing, the expanding law and features of the new fractures, etc. are discussed. The field practice shows the study results have strong theoretical ground and applicable value, and provide important technical tools for increasing and stable production of low permeable oil/gas fields at late stage.

关 键 词：重复压裂 气井 油气层 后期开发 压裂井 开发效果 低渗透油气田 难度 证明 核心问题 

分 类 号：TE377[石油与天然气工程—油气田开发工程]