摘要
鲜有文献报道井附近存在直线断层(尤其是断层位于复合油气藏内区)对试井解释的影响,因此,从渗流力学理论出发,首先建立考虑表皮和井筒储集的无限大地层两区径向复合油气藏试井解释数学模型,并通过拉氏变换对模型进行求解,再利用镜像反映原理和叠加原理研究存在直线断层的复合油气藏的无因次井底压力及压力导数曲线特征及影响因素。研究表明,当井到断层距离小于1/2内区半径时,无因次压力导数曲线将由无限作用径向流的0.5水平线变为内区受断层影响的1.0水平线和外区受断层影响的值为M_(12)水平线;当井到断层距离大于1/2内区半径时,无因次压力导数曲线将由无限作用径向流的0.5水平线变为反映外区特征的值为M_(12)水平线和反映外区受断层影响的值为M_(12)的水平线。
There are few reports in the literature on the effects of linear faults on well test interpretations,especially for linear faults located within combined oil and gas reservoirs.To address this gap,we have constructed a mathematical model for interpreting well tests from infinite formation combined oil and gas reservoirs with two radial zones based on seepage mechanics.Solutions for this model were obtained via Laplace transformations;the principles of image theory and superposition were then used to study the dimensionless bottom hole pressure and pressure derivative curves corresponding to combined oil and gas reservoirs that contain linear faults,along with the factors affecting these curves.The results of this study are as follows:when the distance between a fault and well is less than half the radius of the inner area,the dimensionless pressure derivative curve changes from the0.5horizontal line,indicative of an infinite-acting radial flow,to the1.0horizontal line,indicative of a faultaffected inner area,and the value that shows the fault′s impact on the outer area is the M12horizontal line.When the distance between a fault and well is more than half the radius of the inner area,the dimensionless pressure derivative curve shifts from the0.5horizontal line,corresponding to an infinite-acting radial flow,to the M12/2horizontal line,which shows the characteristics of the outer area,and the value that is indicative of the fault′s impact on the outer area is the M12horizontal line.
作者
刘启国
金吉焱
贵富
李科
成显安
LIU Qiguo;JIN Jiyan;GUI Fu;LI Ke;CHENG Xian-an(School of Oil & Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;The Second Mud Logging Branch, CNPC Bohai Drilling Engineering Co. Ltd., Renqiu, Hebei 061000, China)
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第4期113-118,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项(2017ZX05009004-004)
国家科技重大专项(2016ZX05015003-003-001)
关键词
复合油气藏
试井分析
压力动态
断层边界
镜像反映
combined oil and gas reservoirs
well test analysis
pressure dynamics
fault boundaries
image theory
