复合气藏Blasingame产量递减曲线分析方法研究与应用  

Research and Application of Blasingame Analysis Method of Production Decline Curve for Composite Gas Reservoirs

作　　者：姚长江[1] 

机构地区：[1]中国石油辽河油田公司,辽宁盘锦124010

出　　处：《中外能源》2015年第7期55-58,共4页Sino-Global Energy

摘　　要：国内外发现的复合气藏已有很多,然而对复合气藏产量递减分析方法的研究还很少,因此开展复合气藏产量递减分析方法研究对复合气藏开发具有重要的现实意义。利用物质平衡时间改变了复合气藏Fetkovich产量递减曲线的表现形式,建立了圆形封闭复合气藏定压生产数学模型,利用Laplace变换方法 ,求出了井壁压力的拉氏空间解和产量的解析解,通过设立新的无量纲量,形成了复合气藏Blasingame产量递减曲线分析方法。理论分析表明,该方法能够改进复合气藏Fetkovich分析方法恒定工作制度的苛刻限制,扩大了应用范围,且曲线具有较好的光滑性,分辨率高,有利于现场应用。以某气井为例进行曲线拟合实例分析,结果表明该分析方法具有较高的准确性,可为评价气藏性质及制定开发方案提供可靠依据。Many composite gas reservoirs had been found at home and abroad ,but there are only few re- searches on production decline analysis methods for the composite gas reservoirs.So the research on the pro- duction decline analysis methods is of important practical significance for the composite gas reservoirs.Material balance time was applied to the changes of the expression form of Fetkovich method for production decline curve.A mathematical model was set up for the closed circle composite gas reservoirs developed at constant pressure.The Laplace transform was applied to solving the Laplace space solutions of wellbore pressure and analytical solutions of production.A new dimensionless quantity was established and Blasingame analysis method of production decline curve for the composite gas reservoirs was formed.In theory,Blasingame method can improve the harsh restrictions compared with Fetkovich method which needs constant work systems,and expand the range of applications.The curve has better smoothness and high resolution,which is favorable for field application.Curve fitting was analyzed on certain gas well.The result shows that this method has higher accuracy and can provide a reliable basis for the properties evaluating and the development programming for the gas reservoir.

关 键 词：复合气藏 气井 现代产量递减曲线分析方法 Blasingame图版拟合法 应用 

分 类 号：TE328[石油与天然气工程—油气田开发工程]