广适水驱特征曲线的适用性及应用方法研究

水驱特征曲线法是利用生产资料预测水驱开发油田进入中高含水阶段以后水驱可采储量的重要手段之一，国内外学者提出并改进形成了70多种水驱特征曲线，但适用条件和预测精度各有千秋，制约着水驱特征曲线应用的效率及效果，行业标准中推荐的水驱特征曲线也在根据实践认识不断变化。本文首先通过分析广适水驱特征曲线及常用水驱特征曲线的物理意义，认为广适水驱特征曲线具有较强的适用性，提出了常用水驱特征曲线谱系图，进而建立了近似理论曲线、广适曲线、丙型曲线、丁型曲线之间内在关系的认识；接着基于丙型、丁型水驱特征曲线提出了广适水驱特征曲线的简易求解思路，建立了广适水驱特征曲线在层状水驱、底水驱或者两种方式并存油田中的应用方法，将具有唯一解的常用水驱特征曲线优选问题转化为广适水驱特征曲线与丙型、丁型曲线联合求取唯一解问题；最后以海上多个典型油田为例进行了应用，大幅提高了不同水驱方式下水驱可采储量预测精度及决策效率。

Study on Universality and Application of Universal Water Drive Characteristic Curve

Water drive characteristic curve is one of the important means of predicting recoverable reserves predicted based on production data in high water cut oilfields. 70 kinds of water flooding characteristic curve have been put forward by domestic and foreign scholars, but the applicable conditions and the prediction accuracy have their own merits and drawbacks. First the principle of the universal water flooding characteristic curve and common water drive characteristic curve formulas has been analyzed, which means the universal water flooding characteristic curve has comprehensive merits, then the pedigree chart of common water drive characteristic curves has been put forward, which initiates the recognition on the relationships among the five water drive characteristic curves. A technical ideas for solving the universal water flooding characteristic based on the Bing-type curve and the Ding-type curve has been established, which quantifies the applicable conditions of the universal water flooding characteristic curve in layered water flooding, bottom water drive or two modes coexist oilfields. Finally, the universal water flooding characteristic curve has been applied in several typical offshore oil fields, the prediction accuracy and decision-making efficiency of water flooding recoverable reserves are greatly improved.