稠油油藏减氧空气 高温泡沫剂 蒸汽三元复合吞吐参数优化实验研究

Parameter Optimization of ASP Stimulation of Oxygen Reducing Air/High Temperature Foam/Steam in Heavy Oil Reservoirs

针对探91稠油区块在蒸汽吞吐开采中汽窜严重导致采收率低、见效差的问题,而空气、泡沫具有封堵蒸汽窜的作用,提出了减氧空气、高温泡沫剂、蒸汽三元复合吞吐方案并对其进行参数优化研究。通过并联三管填砂模型模拟地层非均质性来优选出最佳注入参数,最大限度地提高三元复合吞吐最终采收率。研究结果表明:在渗透率级差为4.60时,当注入时机为含水率50%,以混合注入高温泡沫剂和减氧空气的方式,注入蒸汽的压力控制在8.0 MPa以内,高温泡沫剂、减氧空气与蒸汽的段塞组合为1:1:1时,减氧空气、高温泡沫剂、蒸汽三元复合吞吐最终采收率为52.59%,比相同条件下的蒸汽吞吐提高了12.83%。研究认为,减氧空气、高温泡沫剂、蒸汽三元复合吞吐,对于蒸汽吞吐的同类稠油油藏进一步提高原油采收率是可行的。

Serious steam channeling phenomenon in steam stimulation process of Tan91 heavy oil blocks resulted in low recovery efficiency. Therefore, optimization research of ASP stimulation of oxygen reducing air / high-temperature foam / steam of the block was carried out. The injection parameters were optimized according to the experiment of three sand tubes to simulate formation heterogeneity and maximize the ultimate recovery. The results showed that, when the ratio of the maximum permeability to the minimum permeability was 4.60, the water content was 50%, the pressure of mixed injection steam was controlled within 8.0 MPa, the slug combination of high temperature foam and oxygen reducing air and steam was l：l：l,the ultimate recovery efficiency of ASP stimulation reached 52.59%, which was 12.83% higher than that of the steam stimulation. The study suggests that oxygen reducing air / high-temperature foam and steam stimulation is feasible to enhance recovery of heavy oil reservoirs.