三重介质分支水平井试井分析  

Well-test analysis of multi-branched horizontal wells in a triple medium reservoir

作　　者：程时清[1] 张利军[1] 李相方[1] 

机构地区：[1]中国石油大学(北京)教育部石油工程重点实验室,北京昌平102249

出　　处：《水动力学研究与进展（A辑）》2009年第2期127-132,共6页Chinese Journal of Hydrodynamics

基　　金：国家863项目"特殊结构井开发油藏工程技术"(合同编号2006AA09Z338)资助

摘　　要：基于裂缝向井底供液,存在溶洞和裂缝、基岩和裂缝之间的窜流的三重介质模型,建立了这类介质的水平分支井数学模型,并利用源函数和Laplace变换,结合泊松叠加公式和贝塞尔函数积分等方法,解得了分支水平井在拉普拉斯空间下的井底压力解,绘制了三重介质分支水平井试井曲线。指出三重介质分支水平井完整的试井曲线存在八个流动阶段。溶洞和裂缝间的窜流系数主要影响第一下凹段出现时间的早晚,而基岩和裂缝间的窜流系数影响第二个下凹段;溶洞的弹性储容比影响两个下凹的深浅,裂缝的弹性储容比只影响第一个下凹深浅。双重介质只出现一个下凹段,而三重介质出现两个下凹段。A mathematical model of multi-branched horizontal wells in triple medium reservoir when there are two kinds of crossflow was proposed. By using source function, Laplace inverse, poisson superposition and Bessel function integration methods the solutions of bottomhole pressure in Laplace space were obtained, and its derivative curves were drawn. The results show that there are eight flowing phases in whole curves. The crossflow factor between vugs and fracture mainly affects the time when the first sag of the derivative curves appears, but the crossflow factor between matrix and fracture mainly affects the second sag; the storage ratio of vugs affects two sags＇ extent, but the storage ratio of fracture only affects the first sags＇. There is only one sag in dual-medium reservoir, but two sags in tri-medium reservoir pressure derivate curves.

关 键 词：三重介质 分支水平井 试井 源函数 贝塞尔函数 

分 类 号：TE312[石油与天然气工程—油气田开发工程]