胜利油田化学驱扩大水驱波及系数预测方法研究

A Prediction Method of Expanding Water Flooding Sweep Efficiency by Chemical Flooding in Shengli Oilfield

以胜利孤岛油田化学驱开发区块地质参数为基础,根据现场使用的聚合物、二元复合驱用量参数及实际井网方式、注采参数,进行聚合物及二元复合驱扩大波及系数的规律研究。利用正交设计法对影响化学驱扩大波及系数和提高原油采收率的关键地质因素进行筛选。在此基础上,根据胜利孤岛油田实际油藏参数选取关键地质参数及注入流体介质的物性参数的不同水平值,建立不同化学驱替方式下的数值模拟模型,并对模拟结果进行分析及数学回归,最终得到了聚合物驱及二元复合驱扩大水驱波及系数与关键地质因素及流体物性参数之间的数学模型,并利用该模型对孤岛油田化学驱区块扩大水驱波及系数及提高采收率值进行预测。

Based on the geological parameters of Gudao reservoir in Shengli Oilfield, the research on expanding wa- ter flooding sweep efficiency by chemical flooding is implemented according to injection volume, well pattern, in- jection - production parameters of polymer flooding or surfactant - polymer compound flooding in field applications. The method of orthogonal design is employed to select the critical parameters influencing on expanding sweep effi- ciency and increasing oil recovery by chemical flooding. Numerical simulation is utilized to analyze oil recovery and sweep efficiency of different flooding methods, such as water flooding, polymer flooding and surfactant - polymer compound flooding. Finally, mathematical models are established to calculate the expanding degree of sweep effi- ciency by polymer flooding or SP compound flooding than water flooding.