摘要
Abstract
After the polymer flooding,the remained oil in the reservoirs is extremely dispersed,the water flooded parts in the medium and lower waterflooded positions are alternately distributed with the preferential seepage channels,so the production difficulty is rather bigger and the economic benefit is so poorer.How to identify and control the preferential seepage channels is the issue to be solved urgently in the present polymer flooded reservoirs.Taking a certain block of the first-type reservoir in Sanan Developing Area of Daqing Oilfield as an example,by means of defining the boundary values of the effective permeability and oil saturation,integrated with the dynamic data,the preferential seepage channels were identified and verified.And moreover the dynamic characteristics were described,compared with the other developing area of Daqing Placanticline Oilfields;the developed characteristics of the preferential seepage channels after the polymer flooding were generally coincident.According to the differences of the channel development and dynamic characteristics,the adjusting directions were made clear,with the help of the controlling and stimulating method such as the optimized viscosity,layer separation,water plugging,profile control and so on,much better field application effects were achieved.All the results have provided the evidences for the identification and management of the preferential seepage channels after the polymer flooding of the oil reservoirs.关键词
聚驱后油层/优势渗流通道/识别/治理Key words
polymer flooded oil reservoir/preferential seepage channel/identification/control分类
能源科技
