柳28断块聚合物凝胶微球在线调剖技术

柳赞油田柳28断块在2002年试注期间,注水开发特征表明油层连通性好,单层突进现象严重,油井含水上升快。2006年正式全面注水开发,为了控制油井含水上升速度,提高原油采油率,在该断块开展了孔喉尺度聚合物凝胶微球在线调剖技术。通过室内实验的评价分析及矿场施工方案的认真设计实施,表明根据油层特点优选凝胶微球的直径、注入浓度和注入速度是决定最终调剖驱油效果的关键。该措施实施后,断块日产油量由72t上升到132t,有效减缓了油井含水上升速度,提高了区块的采收率,改善了注水开发的效果。该技术能满足油藏深部调剖的要求,为类似非均质油藏提高采收率提供了借鉴作用。

Online profile control technology of Gel microspheres at Liu28 fault block

During the injection test of Liu-28 fault block in Liuzan Oilfield in 2002,the waterflooding characteristic indicate that there is a good reservoir connectivity,heavily monolayer breakthrough and rapid upraising of water percentage.Overall waterflooding was formally conducted in 2006.To control the rise of water percentage and enhance the oil recovery rate,online technologies to control profiles of gel polymer microspheres with pore-throat scale are conducted in the block.Based on the evaluation and analysis of lab experiments,the field construction plan is carefully designed and implemented and hence the daily oil output of the block increases to 130 t from 72 t.The rising of water cut is effectively controlled,the enhanced oil recovery is increased,and the effect of waterflooding is improved.The new technology can fulfill the requirements of deep profile control in reservoirs,providing references for enhancing oil recovery of other heterogeneous oil reservoirs.