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Optimization of Injection Parameters for Profile Control and Flooding in an Oilfield during high water cut period

Journal of Geoscience and Environment Protection 2023年第11期11卷 73-81页

作者： Meinan Wang Hui Cai Xiaoqi Chen Junting Zhang Yue Xie Bohai Oilfield Research Institute of CNOOC Ltd. Tianjin Branch Tianjin China

In order to improve the effect of water control and oil stabilization during high water cut period, a mathematical model of five point method well group was established with the high water cut well group of an Oilfield as the target area, the variation law of water cut and recovery factor of different injection parameters was analyzed, and the optimization research of injection parameters of polymer enhanced foam flooding was carried out. The results show that the higher the injection rate, the lower the water content curve, and the higher the oil recovery rate. As the foam defoamed when encountering oil, when the injection time was earlier than 80% of water cut, the later the injection time was, the better the oil displacement effect would be. When the injection time was later than 80% of water cut, the later the injection time was, the worse the oil displacement effect would be. The larger the injection volume, the lower the water content curve and the higher the recovery rate. After the injection volume exceeded 0.2 PV, the amplitude of changes in water content and recovery rate slowed down. The optimal injection parameters of profile control agent for high water content well group in Oilfield A were: injection rate of 15 m3/d, injection timing of 80% water content, and injection volume of 0.2 PV.

关键词： high water cut period Profile Control Injection Rate Injection Timing Injection Volume

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Application of New water Flooding Characteristic Curve in the high water-cut Stage of an Oilfield

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Fluid Dynamics & Materials Processing 2022年第3期18卷 661-677页

作者： Xi Zhang Changquan Wang Hua Wu Xu Zhao School of Petroleum Engineering Yangtze UniversityWuhan430100China Exploration and Development Research Institute of Jianghan Oilfield Company of Sinopec Wuhan430223China

The oil production predicted by means of the conventional water-drive characteristic curve is typically affected by large deviations with respect to the actual value when the so-called high water-cut stage is *** order to solve this problem,a new characteristic relationship between the relative permeability ratio and the average water saturation is *** comparing the outcomes of different matching methods,it is verified that it can well reflect the variation characteristics of the relative permeability ratio *** the new formula with a reservoir engineering method,two new formulas are derived for the water flooding characteristic curve in the high water-cut *** practicability is verified by using the production data of Mawangmiao and Xijiakou *** results show that the error between the predicted cumulative oil production and production data of the two new water drive characteristic curves is less than the error between the B-type water drive characteristic curve and the other two water drive characteristic *** is concluded that the two new characteristic curves can be used to estimate more accurately the recoverable reserves,the final recovery and to estimate the effects of water flooding.

关键词： water flooding characteristic curve high water cut period production dynamic prediction recoverable reserves water flooding

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