聚驱后优势渗流通道识别方法研究——以大庆油田X区块为例

Research on identification method of dominant seepage channels after polymer flooding-a case study of Block X in Daqing Oilfield

由于聚合物驱后期注入液沿着优势渗流低效循环,继续注入聚合物溶液会导致含水上升过快,影响油田开发效果和经济效益。通过累积概率法划分不同水淹级别,采用油藏地质参数和聚驱生产动态参数建立聚驱后优势渗流通道评价体系,并利用灰色关联分析法评价各体系权重,建立优势渗流通道分级界限标准,将该方法应用于大庆油田X区块,明确了各沉积单元各级水淹比例,并通过注水井分层吸水资料对识别的优势渗流通道进行验证,为后期优势渗流通道治理提供了指导。

Due to low efficiency circulation of injected liquid along the dominant seepage flow in the late polymer flooding period,the water cut will rise too fast if injected polymer solution continues,which will affect the oilfield development effect and economic benefit.The evaluation system of the dominant seepage channels after polymer flooding was established by the cumulative probability method,and the weight of each system was evaluated by the gray correlation analysis method.The classification limit standard of the dominant seepage channels was established.The method was applied to Block X of Daqing Oilfield,and the water-flooding ratio of each sedimentary unit was defined.The identified superior seepage channels were verified by the stratified water absorption data of water injection wells,which provided guidance for the treatment of superior seepage channels in the later stage.