The effects of degassing on fluid seepage law in tight oil reservoirs
RAO Yuan1,2, YANG Zhengming2,3, ZHANG Yapu2,3, WU Zhenkai1,2, LIU Chang4
1. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;
2. Institute of Percolation Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;
3. PetroChina Exploration and Development Research Institute, Beijing 100083, China;
4. Tianjin Branch of CNOOC (China) Co., Ltd., Tianjin 300459, China
Abstract：Most of the tight oil reservoirs contain dissolved gas. When the production pressure is lower than the bubble point pressure, the dissolved gas is precipitated, increasing the seepage resistance and affecting the productivity. Based on the porethroat structure characteristics of the tight reservoirs, this paper explores the internal causes of the fluid seepage characteristics of the gas-bearing tight reservoirs, analyzes the fluid flow characteristics and the influencing factors after degassing of the reservoir, and compares the performances of the tight oil reservoirs and the conventional oil reservoirs, focusing on the differences of the fluid seepage characteristics after degassing. The existing research methods are reviewed, as well as the research status of the related mathematical models. Finally, the research trend of the fluid seepage law in the gas-bearing tight reservoirs is prospected.
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2022, Vol. 40 
