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对于复杂断块油气藏而言,砂体往往小、连片性差,但纵向上层数多,常规的单层注水模型已经不能准确的描述油藏的动态特征.为解决上述油藏的渗流问题,建立了多层合注外边界封闭油藏注水井不稳定渗流数学模型,模型中每一层的物性和边界大小各不相同.通过拉普拉斯变换,利用Stehfest数值反演对数学模型进行了求解,获得了多层合注条件下的井底压力响应特征曲线,并将曲线划分为六个阶段.研究表明主力层的砂体边界大小对井底压力动态影响较大;受多层干扰影响,用常规理论方法计算的边界大小有可能与实际地质情况不一致.
For complex fault block reservoirs, sand bodies tend to be small and contiguous, but the number of layers in the vertical direction is large, and the conventional single-layer water injection model can not accurately describe the dynamic characteristics of the reservoir.In order to solve the seepage problem of the above reservoirs, Established a mathematical model of unsteady seepage of multi-layer closed-reservoir oil-injection wells in closed-boundary reservoirs, in which the physical properties and the boundary of each layer are different.According to Laplace transform and Stehfest numerical inversion, The pressure response curve of bottom hole under multi-layer injection conditions was obtained, and the curve was divided into six stages.The results show that the size of the sand body boundary of main layer has a great influence on the pressure of bottom hole, , The size of the boundary calculated by the conventional theoretical methods may not be consistent with the actual geological conditions.