Effect of Heterogeneity on Water Producing of Ultra-low Permeability Oil Reservoir：An Experimental Study
YANG Zhengming1,2, GAO Tianfang1, FENG Cheng3, WANG Zhi4, LIU Xuewei2
1. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
2. Langfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China;
3. China Petroleum Pipeline Engineering Corporation, Langfang 065007, China;
4. North China Petroleum Bureau of Sinopec Group, Zhengzhou 450006, China
Abstract：Ultra-low permeability reservoirs have the characteristic of generally developed micro-fractures which lead to strong heterogeneity. Fractured rock cores are made to simulate different combination modes of natural depletion of ultra-low permeability reservoir in this paper. An experimental method of making fractured cores and using them to simulate nature depletion is established. It is a new method that simulates the production performance of an inhomogeneous reservoir through the rock cores parallel water flooding experiment. The results show that the water cut rising process of the heterogeneity reservoir can be divided into four stages. They are the free water oil production stage, water cut rising stage, high water saturation rising stage, and high water cut stage. The features of the water cut curve are influenced by the average water permeability, permeability ratio and micro-fracture. The water cut rising changes of high permeability reservoir, water layer and layers with developed micro-fractures should be focused on in oil field production.
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2014, Vol. 32 
