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杜84块及杜229块超稠油油藏主要采用蒸汽吞吐和SAGD两种方式进行开发,经过多年开采已进入开发中后期,蒸汽吞吐开发面临着地层压力下降、油藏动用不均等制约因素,SAGD开发则因汽腔压力高、热量散失大等因素导致蒸汽热效率极低。经研究表明,通过向油藏中注入合适当量气体,可有效缓解上述诸多矛盾,改善超稠油油藏开发后期生产效果。
Du 84 and Du 229 super heavy oil reservoirs are mainly developed by steam stimulation and SAGD. After years of exploitation, they have entered the middle and late stages of development. The development of steam stimulation is confronted with the restriction of formation pressure and uneven utilization of reservoirs, SAGD development is due to high pressure steam chamber, heat loss and other factors lead to extremely low steam thermal efficiency. The study shows that by injecting the appropriate amount of gas into the reservoir, these contradictions can be effectively alleviated and the production effect of the ultra-heavy oil reservoir can be improved later.