白于山长4+5区块整体调剖效果评价

Effect evaluation of integrated profile control in Baiyushan Chang4+5 oilfield

白于山长4+5区块属典型的低渗裂缝型油藏,区块大规模压裂建产使人工裂缝与天然裂缝沟通,开发过程中含水上升速度越来越快,水淹产能损失严重。2010年底区块综合含水达70%,自然递减17.4%,采出程度仅6.1%,开发形势严峻。为改善区块开发效果,2011年在该区开展整体调剖稳油控水治理技术研究与应用。调剖后,14口注水井注水压力平均上升2.8MPa,吸水指示曲线、压降曲线及吸水剖面等测试结果表明裂缝带得到了有效封堵,吸水剖面得到了明显调整和改善,水驱波及体积扩大。区块自然递减降低至14.9%、综合含水和含水上升率分别降低至65.6%和-5.6%,开发指标全面好转。整体调剖显著改善了该区注水开发效果。

The Baiyushan Chang4＋5 block is a typical low permeability reservoir with natural fractures. With early large-scale fracturing development,water-cut raises to 70 % and natu- ral decline rate raises to 17.4 % in the end of 2010 as natural fractures and artificial frac- tures interconnected.Production loss is increasing because of seriously water out.Unfortunate- ly,recovery of reserves is only 6.1%.It is in a severe situation.Therefore,integrated profile control is applied to stabilize oil production and to control water cut and finally to improve development effect.Through overall profile control,water injection pressure of 14 water injec- tion wells increased by 2.8 MPa averagely.Water index curves, pressure drop curve and wa- ter injection profile data shows that profile control agents sealed off fractures and high per- meability zones effectively,and adjusted water injection profile significantly, and enlarged wa- ter flooding swept volume.The natural decline rate of block decreased to 14.9 %,water cut and water cut increasing rate decreased to 65.6 % and -5.6 % respectively.With develop- ment index is all-round for the better.Integrated profile control improves effect of waterfloodin block significantly.