双河油田开发后期层系转换实践与探索

PRACTICE OF PRODUCTIVE LAYER CONVERSION IN MATURE SHUANGHE OILFIELD

双河油田处于特高含水开发期，水驱采收率突破45％，大面积强水淹，纵向近三分之二的厚度强水淹。通过对开发后期潜力分布特点分析和低效并成因分析，确定了提高开发效益的层系转换对象，即累积采出油量高，目的层系剩余油少的老采油井；二次加密井开采的小面积剩余油富集区的井点；油水边界水侵严重的井点等。并制定出相应的层系转换原则，根据这些原则进行具体层系转换，取得了增油降水效果。

Extremely high water cut occurs in shuanghe oimeld, with over 45% of water-flooding recovery. Strong water-out occurs areally and vertically (up to two-thirds of pay zone). Analysis of distribution of production potential and the cause of stripper well selects the candidates for altemative productive layers, i.e. oil well with high cumulative production and low residual oil reserves in existing productive layers;oil well with small-area residual oil accumulation after secondare infilling; oil well with severe water invasion at its boundare; etc, and then draws up a principle for altemahve layers. Case study shows it succeeded in increasing oil production and reducing water cut.