肯基亚克盐上稠油油藏优选注过热蒸汽开发方式研究

哈萨克斯坦肯基亚克油田盐上稠油油藏具有埋藏浅、物性好、非均质性强、原油黏度高、边水较活跃等特点.经过40多年衰竭式开采,由于边水突进,导致油井高含水,但采出程度很低,油田长期处于低速、低效开发状态.针对这一问题,进行了热水驱、聚合物驱、饱和蒸汽驱、过热蒸汽驱的室内物理模拟和数值模拟对比研究.结果表明,盐上油藏中侏罗统油层采用300℃过热蒸汽驱油效率最高,平均达到88.2%,数值模拟研究其开发指标预测采出程度最高达到47.46%,显示注过热蒸汽适合该油藏储层特征,是当前开采状态的最佳开发方式.

Selection of Superheated Steam Flooding in Kenkiyak Heavy-oil Reservoirs

Kenkiyak oil Field features high -viscosity oil, strong heterogeneity, shallow burial depth, high permeability and porosity, and huge edge water. After 40 years' depletion development, the seriously heterogeneous nature and water invasion make the water- cut of oil wells as high as 76%. Furthermore, high oil viscosity and low flow ability result in low production and rapid declining of primary development. Therefore, the recovery factor of the reservoir is very low. The production is in an inefficient state...