部分打开的多层气藏不稳定试井的半透壁模型及数值模拟研究

由于沉积的原因，很多油气藏都由多层构成。这类油气藏可分为两种类型，一种是各层之间被不渗透的隔层分割开来，没有层间越流存在；另一种是层间有连通现象，具有层间越流。文章在前人工作的基础上，特别是研究有关分层油藏半透壁模型及其在试井中的各项应用成果的基础之上，建立了多层气藏的半透壁模型及其微分方程组，并且对部分打开气层进行合采的试井过程，利用有限差分方法编制了模拟试井程序。通过对模拟计算结果的分析，阐明了井底压力曲线的特点，并说明了气藏层间越流的特点及性状。

A RESEARCH ON THE SEMI-PERMEABLE WALL MODEL AND NUMERICAL SIMULATION OF TRANSIENT TESTING IN MULTILAYER GAS RESERVOIR PERFORATED PARTIALLY

Many oil and gas reservoirs are composed of multilayer because of sedimentation.Such kind of oil and gas reservoirs may be divided into two types:one is that every layer is separated by impermeable barries,having no interzonal crossflow;and the other is that every layer is connected with each other,having interzonal cross-flow.On the basis of the works finished by our predecessors,especially of the results of studying the semipermeable well model of separate zone oil reservoir and its every application in well-testing,the semipermeable wall model of multilayer gas reservoir and its differential equation group were set up and a simulation testing program was developed for the testing in partially-perforated and commingled gas reservoir by use of finite-difference method.According to the simulation calculating result,the property of bottom-hole pressure curve and the character and occurrence of the interzonal cross-flow in gas reservoir are stated in the paper.