稠油油藏蒸汽-表面活性剂复合驱数值模拟研究

对稠油油藏蒸汽表面活性剂复合驱的渗流机理及所涉及的物理化学现象进行了研究 ,建立了完整的数学模型 ,提出了用Crank Nicolson差分格式求解水相中浓度的新方法。运用自行研制的软件对一个油藏区块进行了模拟计算 ,并对复合驱渗流机理及影响复合驱驱油效果的因素进行了分析研究。结果表明 ,表面活性剂浓度对驱油效果的影响取决于表面活性剂的界面特性和总用量 ,加入表面活性剂的时机对最终驱油效果影响不大 ,吸附量大的表面活性剂的驱油效果差。

NUMERICAL SIMULATION OF STEAM-SUR-FACTANT COMBINED FLOODING FOR HEAVY OIL RESERVOIR

Based on experiment study and field tests, the mechanism of fluid flow and physicochemical phenomena in steam surfactant combined flooding process is studied. A three dimension, three phase, multi component combined flooding mathematical model is developed. A new method to calculate the concentration of surfactant in aqueous phase is presented. In an actual injection production unit, the developed software is used to study the mechanism of combined flooding, and various factors which dominate the combined flooding effect are investigated. The results indicate that the effect of surfactant concentration on displacement efficiency is determined by its surface characters and total quantity. The injecting time of surfactant has little effect on displacement efficiency. The surfactant with more adsorption has poor displacement efficiency.