渤海稠油油藏复合调驱逐级封窜增效技术

Synergistic Technology of Polymer Microsphere Profile Control and Flooding in Bohai Heavy Oil Reservoir

渤海油田多数区块长期注水开发导致储层非均质性严重且含有超强水窜通道,造成注入水无效循环,采收率下降。为此,以BHQH油田南区储层性质及流体为研究对象,通过室内两层非均质岩心驱替实验,以采收率、含水率为评价对象,确定以聚合物凝胶+聚合物微球的"堵+驱"调驱增效体系,经在BHQH油田D井组试验,受效井日增油83 m^(3),有效期超12个月,累积增油超20 000 m^(3),平均产量增幅超过300%,含水最高下降11%。该调驱增效体系是高含水、含超强水窜通道油藏控水增油的有效方法,可为类似储层增产设计提供借鉴。

The long-term water injection development of most blocks in Bohai oilfield has resulted in severe reservoir heterogeneity and super-strong water channeling channels, causing an invalid circulation of injected water and a decrease in recovery. For this reason, the reservoir properties and fluids in the southern area of BHQH oilfield were used as the research objects, through the two-layer heterogeneous core displacement experiment, the recovery rate and water cut were evaluated, and the polymer gel + polymer microspheres aiming at "plugging + flooding" were confirmed as flooding enhancement system. After the test in well group D of BHQH oil field, the effected wells increased oil by 83 m^(3) per day, the validity period exceeded 12 months, the cumulative oil increase exceeded 20 000 m^(3), the average production increased by more than 300%, and the water cut decreased by 11%. The profile control and flood enhancement system is an effective method for controlling water and increasing oil in reservoirs with high water cut and ultra-strong water channeling, and can provide reference for similar reservoir stimulation design.