孔隙型碳酸岩油藏拟稳态采油指数的确定方法初步研究

Primary study of method for determining of productivity index for pore type carbonate reservoir in pseudo stable state

根据孔隙型碳酸盐岩储层分类标准,中东F油田储层属于中低孔、低渗—特低渗储层,油藏在平面和纵向上具有极强的非均质性。通过常规试井求取的单井采油指数,只能反应不稳定采油指数,而计算拟稳态下的采油指数才能对油井及油田的动态具有指导意义。目前对于此类碳酸岩油藏确定拟稳态采油指数还没有成熟的方法,利用数值试井结合动态地质模型及理论公式对拟稳态采油指数进行了初步研究,并根据碳酸岩油藏岩石类型分类结果,预测拟稳态采油指数的平面分布规律,研究结果可以较好地预测新井产能,高效地指导油藏开发。

According to the classification standard of pore type carbonate reservoir, the formation of oil field F in Middle East has middle-low porosity and low-extra low permeability, which has serious heterogeneity in plane and longitudinal direction. The pro？duction index（PI） computed by conventional well testing is transient PI. In fact, the PSS PI is useful for guiding the performance of single well or oil field. Currently, there is no maturely method to determine the PSS PI of pore type carbonate reservoir. This paper addresses the primary study of PSS PI through integrating numerical well testing data, dynamical simulation model, and theoretical equation. Based on rock typing results of carbonate reservoir, the plane distribution laws of PSS PI can be obtained. The results can well predict the productivity of new producers and efficiently guide the development of such carbonate reservoir.