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Application of New Water Flooding Characteristic Curve in the High Water-Cut Stage of an Oilfield

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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Production evolution patterns and development stage division of waterflooding oilfields

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Petroleum Exploration and Development 2023年第2期50卷 433-441页

作者： JI Bingyu XU Ting GAO Xingjun YU Hongmin LIU He Sinopec Petroleum Exploration and Production Research Institute Beijing 102206China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China

The continuous growth of recoverable reserves in a waterflooding oilfield has a significant impact on the patterns of production evolution. A new production evolution model is established by improving the Weng Cycle model. With the new model, the statistical correspondence between the production decline stage and the reserve-production imbalance is clarified,and the correlation of water cut with the recovery percent of recoverable reserves is discussed, providing quantitative basis of reservoir engineering for dividing development stages of oilfield and defining mature oilfields. According to the statistics of oilfields in eastern China, the time point corresponding to the reserve-production balance coefficient dropping to less than 1dramatically is well correlated the beginning point of production decline, thus the time when the reserve-production balance coefficient drops dramatically can be taken as the initiation point of production decline stage. The research results show that the water cut and the recovery percent of recoverable reserves have a good statistical match in the high water cut stage, and it is more rational to take both the start point of production decline stage and the water cut of 90%(or the recovery percent of recoverable reserves of 80%) as the critical criteria for defining a mature oilfield. Five production evolution patterns can be summarized as follows: growth–peak plateau–stepped decline, growth–stepped stabilizing–stepped decline, growth–stepped stabilizing–rapid decline, growth–peak plateau–rapid decline, and growth–continuous decline.

关键词： waterflooding oilfield production evolution development stage division recoverable reserves mature oilfield

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