低渗透油藏注水开发存在问题分析

针对目前低渗透油田注水开发存在注水井注入压力上升快、吸水能力变差,采油井产量下降快、采收率低的一些突出问题,分析了产生这些问题的主要原因。研究表明,由于注入水水质问题、储层的敏感性、开采过程中储层有效应力增加以及低渗透油藏过度压裂造成注入水沿裂缝窜流等是造成低渗透油藏注水开发效果差的主要原因,并且储层伤害具有动态性、叠加性和不可恢复性。低渗透油藏注水开发中,应注重注水水质精细处理和注入水与地层水的配伍性,合理控制注采速度,保持地层能量,优化压裂方案,避免因过度压裂引起的注入水窜流,不能有效地开采基质中的剩余油。

Problem Analysis on Low Permeability Reservoir Water Flooding

During the water flooding process of low permeability reservoir,the injection pressure increased rapidly,water intake capacity and the production as well as oil recovery of producing wells decreased significantly.The main reasons causing these problems were analyzed in this paper.It's showed that formation damages in low permeability reservoir and extravagant hydraulic fracturing were the key factors affecting water flooding effect.The formation damages were caused by unqualified injection water,fines migra...