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Physical simulation experiment of water driving by micro-model and fractal features of residual oil distribution
LI Zhong-feng1,HE Shun-li1,YANG Wen-xin2,MEN Cheng-quan1
(1. Faculty of Petroleum Engineering in China University of Petroleum,Beijing 102249, China ;2. Jianghan Oilfield, China Petrochemical Corporation , Qianjiang 433000,Hubei Province,China)
Abstract:
By manufacturing an emulation porous micro-model and applying the simulation technology of micro flow physical experiment and image analysis technology, the physical simulation experiment of water driving micro flow was developed. The process of water driving as well as the form and distribution of residual oil in the physical micro-model was investigated, and water driving processes under different displacement rate, porous structure and viscosity ratio were simulated. With the help of the basic theory of fractal geometry, the box algorithm and R/S analysis relationship formula were deduced, which are used to quantitatively study residual oil microscopic fractal characteristics. Combined with the figures of water driving residual oil distribution, the quantitatively measuring method of figuring the size and spatial distribution of the residual oil saturation was established. The results show that the residual oil decreases with the enhancement of displacement rate, and the residual oil increases with the increase of viscosity of crude oil. The volume dimension figures the quantity of residual oil and is related to the residual oil saturation and pore structure, while fractal dimension shows the homogeneity degree of the residual oil spatial distribution which becomes strong when the fractal dimension expands.
Key words:  porous micro-model  water driving  residual oil  displacement rate  fractal features  volume dimension  fractal dimension