超浅层稠油热采实践

Practice of Thermal Recovery of Heavy Oil in Ultra-shallow Reservoirs

超浅层稠油是国内稠油热采的盲区。以黑油山油田为例,研究了热采模式开发超浅层稠油的可行性,并先后开展了火烧油层、蒸汽驱、蒸汽吞吐试验。结果表明:火烧油层和蒸汽驱都不适合超浅层稠油开采,而蒸汽吞吐在埋深小于140m的稠油层可以获得0.29的油汽比,达到了有效开发超浅层稠油的目的。理论计算蒸汽吞吐极限深度为70m,实际蒸汽吞吐深度已接近60m。研究成果对超浅层稠油热采具有普遍借鉴意义。

Thermal recovery of heavy oil in ultra shallow reservoirs was a blind area in China.The feasibility of heavy oil recovery in ultra-shallow reservoirs by using thermal recovery technology was studied by taking Heiyoushan Oilfield for example.Tests of in-situ combustion,steam flooding and cyclic steam soaking were carried out successively.The results show that in-situ combustion and steam flooding are not suitable for ultra shallow heavy oil production while the cyclic steam soaking can effectively develop ultra-shallow heavy oil in the reservoirs less than 140 mand it can obtain steam an oil-gas ratio of 0.29,by which the purpose of effective development of heavy oil in ultra shallow reservoirs is achieved.The theoretical calculation of limit depth in steam soaking is 70 m,while its actual depth is close to 60 m.It provides a guidance for the thermal recovery of ultra-shallow heavy oil.