海上油田气驱筛选指标界限及潜力评价研究

南海近海西部和珠江口盆地东部海域油藏储层物性与原油性质较好,产能较高,但部分油藏已进入高含水开发阶段,产量递减幅度大。为了进一步提高原油采收率,通过累积频率的数学统计方法建立CO2混相驱、CO2非混相驱、烃类混相驱、烃类非混相驱等气驱提高采收率技术的油藏筛选指标界限体系,对候选区块进行筛选,通过数值模拟预测气驱效果。研究表明,适宜采用气驱技术的多个区块主要分布在南海近海西部涠洲和珠江口盆地东部惠州油田群,提高采收率的潜力巨大。

Evaluation of Gas Drive Screening Index Limit and Potential in Offshore Oilfield

The reservoir physical property and oil property are good in the west of south China sea and east of Zhu-jiangkou basin,and the capacity is high in these areas. But at present some reservoir had entered high water cut stage,so production declines greatly. Therefore,it is an urgent need to improve oilfield development effect and oil recovery. By cumulative frequency mathematical statistics method,the reservoir screening index limit of CO2 misci-ble flooding,immiscible CO2 flooding,hydrocarbon miscible flooding and hydrocarbon immiscible flooding were es-tablished. The candidate oilfield blocks of the south China sea area were screened,and the effect of gas drive was predicted through numerical simulation. The results show that the blocks suitable for gas drive, mainly distributed in Weizhou and Huizhou oilfield groups,with great recovery potential.