蒸汽+烟道气+化学剂复合驱提高稠油采收率研究

Research on Compound Flooding of Steam+Flue Gas+Chemical Agent for Enhancing Heavy Oil Recovery

针对锦45块油藏,利用物理模拟实验技术和油藏数值模拟技术进行了吞吐后转蒸汽+烟道气+化学剂复合驱驱油效果评价和参数优化研究。物模结果表明,蒸汽+烟道气+化学剂复合驱与单一蒸汽驱相比具有较明显的优势,驱油效率提高了13.92%;数模结果表明,采用118 m井距反九点井网、泡沫段塞大小为0.2 PV、注入方式选择10 d泡沫段塞和10 d烟道气交替注入、注采比选择1∶1的复合驱开采效果较好,转驱后合计采出程度可达19.25%。由此可见,蒸汽+烟道气+化学剂复合驱可用作稠油油藏吞吐后的接替方式,也可作为蒸汽驱开发阶段的调整方式。

Aimed at Jin45 Block reservoir,physical and numerical simulation technologies were used to evaluate the effect of the compound flooding of steam＋ flue gas＋ chemical agent and optimize the parameters after steam stimulation.The physical simulation results showed that the compound flooding of steam＋ flue gas＋ chemical agent had obvious advantage over steam flooding,the displacement efficiency of which increased 13.92%.The numerical simulation results showed that with the inverted nine-spot pattern of 118 m well space,the foam slug size of 0.2 PV,the alternating injection mode of 10 d foam slug and 10 d flue gas,the injection and production ratio of 1∶1,the recovery of the compound flooding was relatively better and total recovery percent of reserves reached 19.25%.It can be seen that the compound flooding can be used as replacement mode of steam stimulation and adjustment mode in steam flooding.