低渗透油藏毛细管压力动态效应.pdfVIP

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低渗透油藏毛细管压力动态效应.pdf

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低渗透油藏毛细管压力动态效应.pdf

378 2012 6 PETROLEUM EXPLORATION AND DEVELOPMENT Vol.39 No.3 文章编号：1000-0747(2012)03-0378-07 低渗透油藏毛细管压力动态效应基金项目：2011ZX05009-004 摘要： 7 3 20 关键词：中图分类号：TE112.23 文献标识码：A Dynamic effect of capillary pressure in low permeability reservoirs Tian Shubao, Lei Gang, He Shunli, Yang Limin (Education Ministry Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China) Abstract: The dynamic effect of capillary pressure in oil-water two-phase percolation flow in low permeability reservoirs was investigated by experiment and numerical simulation. An experimental apparatus was constructed to measure the relationship between the dynamic capillary pressure and water saturation change rate, and the dynamic capillary coefficient of low-permeability cores was calculated. A one-dimensional mathematical percolation model was established to analyze the effect of dynamic capillary pressure on waterflooding process. The dynamic capillary pressure effect is too significant to be neglected. The relationship between the dynamic capillary pressure and the change rate of wetting phase saturation is almost linear. The lower the rock permeability is, the greater the dynamic capillary coefficient and threshold pressure gradient are. One of the reasons for non-Darcy two-phase percolation flow is the dynamic capillary pressure effect. The dynamic capillary pressure in low permeability reservoirs has a significant influence on development indices such as the velocity of displacement front, water breakthrough time, pressure distribution, oil production rate, and recovery degree. Key words: low permeability reservoirs; dynamic capillary pressure; static capillary pressure; dynamic cap