超稠油热化学复合体系影响因素实验研究

胜利油田王庄郑411块运用热-化学复合体系实现了特超稠油油藏的有效动用,其影响热-化学复合体系驱油效率的因素主要有油溶性降黏剂、二氧化碳和蒸汽。运用正交设计原理,对热-化学复合体系驱油的影响因素进行了室内实验研究,分析不同因素对驱替效果及驱替特征的影响。结果表明,蒸汽对热-化学复合体系驱油效果的影响最大,其次是二氧化碳和油溶性降黏剂;且蒸汽对驱油效果的影响远大于后两者。通过分析热-化学复合体系的驱油特征发现,由于油溶性降黏剂和二氧化碳都有较好的降黏作用。先期注入油溶性复合降黏剂和二氧化碳,有效发挥了两者的协同降黏作用,大幅度降低超稠油黏度,从而有效的降低了注汽压力。

Experimental Study on the Affecting Factors of Thermochemical Complex System in Ultra-heavy Oil Reservoir

Thermochemical complex flooding is utilized to enhance the recovery of super-heavy oil reservoir in Zheng 411 block of Shengli Oil Field. Three main factors which affect the oil displacement efficiency of the thermochemical complex flooding are oil soluble dissolver, CO2 and steam. Many experiments are conducted in this paper in order to research the efficiency of oil displacement affected by three factors mentioned above in the thermochemical complex system with the combination of the orthogonal design. The results show that steam has the most important impact on displacement efficiency of thermochemical complex flooding. The analysis on displacement characteristic of thermochemical complex flooding shows that the injection of oil soluble dissolver and CO2 can reduce the injection pressure of steam dramatically because of synergistic viscosity reduction of dissolver and CO2.