恒压干扰试井测定双重孔隙特性  

Testing Double-Porosity Properties under the Condition of Constant-Pressure Interference in Disturb Well

作　　者：陈彦丽[1] 刘启国[1] 王伟[1] 

机构地区：[1]西南石油学院

出　　处：《内蒙古石油化工》2006年第4期19-22,共4页Inner Mongolia Petrochemical Industry

摘　　要：这篇文章阐述的是在恒压生产的无限大油藏用干扰压力数据测定双重孔隙特性的一种分析方法。忽略了生产井和观测井的井筒储集和表皮效应。研究的是rD、ω、λ等参数对干扰压力响应的影响。对于无因次井间距离大于100的情况压力响应事实上是失败的。典型曲线用来反映的是给定压力和rD时可以得到唯一的ω和λ的值。除双对数典型曲线外,半对数典型曲线在无因次压力值>0.1时应用的更多。本文也考虑了干扰压力导数的半对数图。压力导数放大了双重孔隙天然油藏流动阶段的压力响应的微小变化。本文观察了rD和λ的相互关系,当rD的值大于100时的导数曲线可能是失败的。因此发展了一种半对数导数的典型曲线。这个曲线有两个峰值,即被λ影响的最早和最晚工作点。第一个峰值和第二个峰值之间的时间间隔是ω的函数。This study presents an analytical method to determine double-porosity reservoir propeties with interference pressure data in an infinite reservoir producing at constant pressure. Wellbore--strage and skin effects at production and observation wells are neglected. The effects of rD,ω,λ and on interference pressure responses are examined. For dimensionless interwell distances 100, the pressure responses are practically collapsed. As a result, a general type curve, which can be need for any value of rD, is presented that yields unique values of λ and ω for a given pressure response and rD. In addition to the log-log type curve, a semilog type curve than is more useful for pD values 〉0.1 is presented. Semilog derivatives of the interference pressure responses are considered. The pressure derivatives enhance small variations that occur in the pressure response during the flow period affected by the double-porosity nature of the reservoir. It is observed that for a simple correlation with λ and to,the derivative curve for rovalves 〉100 can be collapsed. Hence,a semilog derivative type curve is developed. This type curve has two maxima. Early-and late-ime behaviors are influenced by λ The time separation between the first an second maxima is a function of ω.

关 键 词：恒压 干扰压力 测定 双重孔隙 

分 类 号：TE353[石油与天然气工程—油气田开发工程] X517.06[环境科学与工程—环境工程]