高含水后期周期注水实践与认识

针对大庆杏南油田某区块高含水后期注水开发个别井区产液量高、含水高、动用状况不均衡、常规注水难以再扩大波及体积等问题,优选井组实施周期注水,根据周期注水原则确定周期注水井注水方式。实施周期注水后产量递减和含水上升速度减缓,注入水利用率提高,数值模拟结果表明,预计可提高采最终收率0.68个百分点,实现了高含水后期注水高效开发。

High water cut stage late cyclic waterflooding practice and recognition

In view of the Daqing Xingnan oilfield the latter part of a block of high water cut wells,individual water injection zone lies some problems including the high well fluid,high water cut stage,the producing situation imbalanced,conventional waterflood difficult to further expand the swept volume and so on,the optimal well group implements the cyclic flooding.According to the cyclic flooding determined in the water injection mode,after implementation cyclic flooding,the production declined,water cut rise slowly,water injection improves.The result of numerical simulation indicates that it will raise the recovery ratio 0.68 percentage point.Which realized highly effective development of the high water cut late stage water injection.