水驱砂岩油藏注采窜流井区判别研究

Study on discrimination of injection-production well area with channelling in water-flooding sandstone reservoir

为治理水驱油藏的水窜现象、提高注水利用率,需要确定出油藏存在窜流的低效注采井区、层位。根据油田开发实践,提出能反映油水井发生水窜的动态特征指标,然后选用适当的数学方法对各类指标进行无量纲化处理,得出反映油藏注采井间窜流状况的评价指标集,利用权重系数法得到评判油藏注采井间窜流严重程度的综合评价指数。通过油田的开发实践总结,建立产生井间窜流的评价标准,以及判别油藏注采窜流井区的方法;通过在江苏油田Z2断块油藏的实际应用,证明该方法的可行性,具有一定的应用前景。

In order to address the chanelling phenomenon in water-flooding reservoir and improve injection efficiency,the inefficient injection-production well areas and layers in which interporosity flow existes are need to be determined.Based on the oilfield development practises,the dynamic characteristics indices reflecting water channelling are proposed,and various indices are handled dimensionlessly with the selected mathematic method to form a evaluation set which can reflect the channelling condition between injection-production well.And the comprehensive evaluation index,which can evaluate the channelling degree between injection-production well,is derived by the weight coefficient method.By summarized the oilfield development practices,the evaluation criteria for chanelling between wells and the method discriminating the injection-production well area with interporosity floww were established.Through the application in Z2 block,the method is proved to be practical,and has a certain application prospect.