层状断块油藏特高含水期细分开发技术

THE TECHNOLOGY OF SUBDIVISION DEVELOPMENT IN THE STRATIFIED AND FAULT-BLOCK RESERVOIR IN THE PERIOD OF SUPER-HIGH WATER CUT

辛 4 7断块是一个高丰度的层状断块油藏 ,采用分层系注水开发。在同套开发井网内 ,由于受非均质的影响 ,层间水驱状况不均衡。 1999年 ,断块进入特高含水期后 ,层间矛盾加剧 ,原有开发层系和井网已不适应油藏挖潜需要。 2 0 0 0年 ,在辛 4 7断块开展了精细油藏描述和细分开发工作 ,效果非常明显 ,断块含水下降了 3% ,采油速度提高了 0 38% ,采收率提高了 5 %。实践表明 ,采用精细油藏描述和细分开发的技术方法 ,对提高层状断块油藏水驱采收率是行之有效的。

Xin 47 block is a stratified and faulted reservoirs with high reserve abundance,in which the technology of zonal injection development was applied.Due to the influence of the heterogencity,the situation of water driving is non equilibrium in the interlayer at the same well pattern.Since 1999,the composite water cut of Xin 47 block was higher than 90% and the conflict of the interlayer became aggravated.The original stratum of production and well pattern would not adjust to the demand of tapping potential production.Since 2000,the work of the fine reservoir description and the subdivision development had been done in Xin 47 faulted reservoir and achieved a very good result.After the work,the composite water cut was decreased by 3% and the rate of oil production was increased by 0.38% and oil recovery was increased by 5%.It is clear that the application of the technology of fine reservoir description and subdivision is feasible for a layered and faulted reservoir to increase the water injection recovery factor.