三重介质油藏斜井压力动态特征分析

Dynamical characteristic analysis of inclined well in triple medium reservoir

针对裂缝与井筒连通,同时存在溶洞和裂缝、基岩和裂缝之间发生拟稳态窜流的三重介质,建立了这类三重介质油藏的斜井试井解释模型,采用汇源叠加等方法求得顶底封闭无限大三重介质油藏斜井在拉氏空间中的井底压力响应,绘制了相应的典型无因次压力曲线版图,分析了顶底封闭无限大三重介质油藏斜井的渗流规律,对其压力特征曲线进行了流动阶段的划分,并讨论了影响压力特征曲线的各种因素。所得的结果有利于提高对三重介质油藏斜井渗流规律的认识,为合理地运用斜井开发三重介质油藏提供理论依据。

Considering the communication of fracture and wellbore when there are two kinds of cross flow,a well test interpretation model of inclined well in triple medium reservoir was proposed.By using sink source superposition,the bottom hole pressure response of inclined well in Laplace space was obtained in triple medium reservoir with the impermeable top and bottom boundaries and an infinitely large system.The plots of typical dimensionless pressure curves were drawn.The flow mechanism of inclined well in triple medium reservoir with the impermeable top and bottom boundaries and an infinitely large system was analyzed.The flowing phases were divided in the pressure characteristic curve.The factors which affect the shape of the pressure characteristic curve were discussed.The results can help one to understand the flow mechanism of inclined wells in triple medium reservoir,it also provides theoretical basis for one to reasonably develop this reservoir by using inclined wells.