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Improvement of water displacement curve for water flooded oil reservoirs at ultra-high water cut stage
HOU Jian1, WANG Rong-rong1, XIA Zhi-zeng1, BING Shao-xian2, SU Ying-hong2, WANG Hua2
(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Geological Scientific Research Institute of Shengli Oilfield, SINOPEC, Dongying 257015, China)
Abstract:
A lot of experimental results and field practices show that the water displacement curve may deviate out from a straight line and unwrap at an ultra-high water cut stage, thus the adaptability of the conventional water displacement curve is poor for water flooded reservoirs at the ultra-high water cut stage. An improved water displacement curve suitable for ultra-high water cut stage was proposed. Firstly, a new characterization equation for the relationship between water-oil relative permeability ratio and water saturation suitable for high water cut was proposed, and then a new water-flooding characteristic curve was derived accordingly. It is found that the conventional water displacement curve can be as a special case of the improved model at low water cut conditions. A method based on equation transformation and linear trial and error method was proposed to determine the parameters in the new water displacement curve equation. A case study was conducted, and the result shows that the new water displacement curve is more accurate than the conventional model in predicting the production performance for reservoirs at ultra-high water cut stage.
Key words:  reservoir  water displacement curve  relative permeability curve  water displacement  ultra-high water cut stage