多层气藏井分层产量贡献计算方法及影响因素  

A COMPUTING METHOD FOR LAYERED PRODUCTION CONTRIBUTION AND AFFECTING FACTORS ANALYZING IN COMMINGLED GAS RESERVOIRS

作　　者：刘启国[1] 王辉[1,2] 王瑞成 李孝常 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500 [2]华海油田注氮技术有限公司,北京100020 [3]中国石油川庆钻探长庆钻井总公司,陕西西安710021 [4]中国石油川庆钻探测井公司,重庆400021

出　　处：《西南石油大学学报（自然科学版）》2010年第1期80-84,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石油中青年创新基金项目(07E1016)

摘　　要：分析了无层间窜流多层气藏渗流机理,建立了考虑井筒储集和各层不同表皮情况下的层间无窜流圆形封闭边界气藏渗流数学模型,求得了多层合采气井分层产量贡献和井底无因次压力在拉普拉斯空间的解析解,利用Steh-fest反演算法获得了分层产量贡献和井底无因次压力在实空间的解。研究表明:(1)不考虑表皮效应影响时,在压力波传播到边界之前,分层产量贡献近似等于βj;当压力波传播到边界形成拟稳态流时,分层产量贡献近似等于ωj;(2)表皮系数Sj的存在使得分层产量贡献不再近似等于βj或ωj,一般而言,表皮系数越大的层其产量贡献将降低,表皮系数越小的层其产量贡献将增大。研究结果有助于现场工艺措施的选择和气井的合理配产。Flowing mechanism in the layered gas reservoirs without crossflow is analyzed and a closed circle boundary mathematical model considering wellbore storage effect and skin effect established.The model was solved with Laplace domain space,and by using Stehfest inversion algorithm,the real analytical solution of dimensionless downhole pressure and the production contribution of each layer in layered gas reservoirs are finally obtained.It is indicated that 1,if ignoring skin effect,layer production contribution is nearly equal to βj before pressure wave reaches boundary and equal to ωj when pressure wave reaches boundary and pseudo-steady state is arrived,2,if skin effect exists,layer production contribution is no longer equal to βj or ωj,generally speaking,the layer with larger skin factor will contribute less while the layer with smaller skin factor will contribute more.The research results are helpful to the selection of field technologic measures and proper production allocation of gas wells.

关 键 词：多层合采 LAPLACE变换 分层产量贡献 压力动态 

分 类 号：TE347[石油与天然气工程—油气田开发工程]