考虑不对称优势渗流通道试井解释数学模型

WELL TEST INTERPRETATION MATHEMATICAL MODEL CONSIDERING ASYMMETRIC PREFERENTIAL SEEPAGE CHANNEL

受储层非均质性和注入水长期冲刷等因素的影响，油层在注水开发过程中极易出现不对称优势渗流通道，如何识别该类不对称优势渗流通道是目前的一大研究热点问题。从渗流力学基本原理出发，利用镜像反应方法获得该类油藏的点源解，沿渗流通道延伸方向进行积分得到存在不对称优势渗流通道的井底压力响应数学模型，并进行了井底压力动态响应影响因素分析。结合建立的数学模型和现场压力测试资料能有效识别地层中的大孔道，对油田调剖堵水、选井选层有一定的指导作用。

Under the influence of reservoir heterogeneity, the long-term flushing process by injected water and other factors, the asymmetric preferential seepage channels tend to appear extremely easily in oil reservoirs during the waterflood development, therefore how to identify this kind of asymmetric preferential seepage channel has become a research hotspot. Based on basic principles of seepage flow mechanism, the point source solution of this kind of reservoir is obtained by mirror reaction, and then a bottom hole pressure response mathematical model with asymmetric preferential seepage channel is established through the integration along the extending direction of seepage channel. Moreover, the influencing factors of the bottomhole pressure dynamic response are analyzed. The high capacity channel in the reservoir can be identified effectively through the combination of the established mathematical model and field pressure test data, which provides a certain degree of guidance for profile control and water shutoff in oilfield and the selection of well sites and producing horizons.