胜利油田不同类型油藏水驱采收率潜力分析

Potential analyses on water drive recovery of different reservoir in Shengli oil field.

分析采收率的影响因素和提高采收率的潜力 ,是油田开发分析的重要工作。根据胜利油田的实际情况 ,结合室内实验和矿场分析资料 ,得出了影响采收率的主要因素为 :油水粘度比、油藏岩石润湿性、油层非均质性等 ;总结了采收率潜力的分析方法 ;给出了高渗透整装油藏、高渗透断块油藏和低渗透油藏的理论驱油效率分别为 0 .45、0 .5 2和 0 .5 0 ,提高采收率的潜力分别为 3.4%、6 .1%和 6 .0 % ;认为这三大类油藏平均可提高采收率 5 %。

An important work of field development is to analyze the influence factors of recovery efficiency and the potential of improving recovery factor. Based on the practice of Shengli oil field along with laboratory experiment and field analysis information, the main influence factors are oil-water viscosity ratio, rock wettability in reservoir, heterogeneity of pay bed and so on. The analytical method of recovery factor potential is summed up. Also the paper gave the theoretical waterflood efficiency of high-permeability complete-structure reservoir, high-permeability fault-block reservoir and low-permeability reservoir. They are 0.45, 0.52 and 0.50 respectively. The potential of improved recovery factor is 4.7%, 6.1% and 6.0% separately. So it concluded that recovery factors in these three types of oil reservoir might increase 5%.