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应用油田生产和油水相对渗透率资料,分析了水驱特征曲线的形态,指出了直线段出现的条件。我国油田在开发过程中大多采用了细分开发层系、钻加密井、完善注采方式、提高排液量以及分层注水、堵水、压裂、酸化等调整措施。文中分析了这些措施对水驱特征曲线的影响,以及在预测可采储量时需注意的问题和方法。文章强调指出,预测油田可采储量必须与开发分析相结合,要认识直线段所表达的物理意义,从而确定预测结果的取舍。在通常情况下,水油比-累积产油量、累积产水量-累积产油量这两条相关曲线的直线段应保持平行,预测时并用这两条曲线有助于提高预测效果。
Based on the data of oilfield production and oil-water relative permeability, the shape of water-flooding characteristic curve is analyzed, and the conditions of straight-line section are pointed out. In the process of oilfield development, most of the oilfields in our country use subdivision development strata, drilling tight wells, perfecting injection and production methods, improving drainage volume, stratified water injection, water shutoff, fracturing and acidification. The paper analyzes the impact of these measures on the water flooding characteristic curve and the problems and methods that should be paid attention to in predicting recoverable reserves. The article emphasizes that predicting the recoverable reserves of oilfields must be combined with the development and analysis, and the physical meaning expressed in the straight-line sections should be recognized to determine the trade-offs of the forecast results. Under normal circumstances, the straight line segments of the two correlation curves of water-oil ratio-cumulative oil production, cumulative water production-cumulated oil production should be kept parallel. The prediction of these two curves will help to improve the prediction results.