CO2 miscible flooding influence degree analysis of reservoir heterogeneity in low permeability reservoir Online publication date: Fri, 02-Sep-2016
by Jinkai Wang; Jun Xie; Hao Lu
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 13, No. 2, 2016
Abstract: In this paper, a later period of water flood reservoir is taken for example to simulate the reservoir heterogeneity influence degree on CO2 flooding. The research was started from studying the heterogeneity influence mechanism, then the two-dimensional plane model, two-dimensional profile model, three-dimensional model have been built to evaluate the CO2 flooding efficiency influence degree of the plane and vertical and interlayer heterogeneity. The results show that the serious reservoir heterogeneity can lead to inject gas breakthrough in one direction or one layer which can reduce the recovery percent. The high vertical in-layer heterogeneity can cause large number of enrichment of remaining oil at the bottom of layer. Relatively, thin effective sand bodies and water alternate gas (WAG) injection type can effectively reduce the influence degree of vertical heterogeneity, which can significantly improve oil recovery percent. [Received: July 28, 2015; Accepted: January 14, 2016]
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