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哈萨克斯坦肯基亚克油田盐上边水稠油油藏经过多年衰竭式开采,边水突进,导致油井含水率高,产量低,采出程度低,亟待转换开发方式。为此,开展了热水驱、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,对盐上油藏中侏罗统油层采用300℃(过热度为50℃)过热蒸汽开发效果最好,驱油效率最高可达到91.7%,对其开发指标进行数值模拟,预测采出程度最高可达47.96%。过热蒸汽吞吐现场先导试验也取得了显著的效果,单轮次吞吐平均单井增油量为1700t,平均含水率下降了13.6%。可见,过热蒸汽驱是适合该油藏储层特征和当前油藏状态的最佳开发方式。
After years of depletion mining, the edge-water breakthrough in the salt-upper water heavy oil reservoir of the Kenkiyak oilfield in Kazakhstan has led to the high water cut, low production and low recovery of oil wells, which is in urgent need of transformation and development. To this end, the hot water flooding, polymer flooding, saturated steam flooding, superheated steam flooding indoor physical simulation and numerical simulation comparative study. The results show that for the middle Jurassic oil reservoir, the superheated steam at 300 ℃ (superheat degree of 50 ℃) is the best, and the highest oil displacement efficiency can reach 91.7%. The development index of the Jurassic reservoir is numerically simulated and predicted The highest level of up to 47.96%. The pilot test of overheated steam stimulation has also achieved remarkable results. The average single well oil throughput per single well was 1700t, and the average moisture content decreased by 13.6%. It can be seen that superheated steam flooding is the best way to develop the reservoir characteristics and current reservoir status.