用灰色模糊综合评判方法识别聚驱后优势通道

GREY-FUZZY COMPREHENSIVE EVALUATING METHOD IDENTIFYING THE PREVAILING CHANNEL AFTER THE POLYMER FLOODING

大庆油田聚驱区块经过长期开发,在注聚阶段聚合物溶液沿优势通道无效窜流,严重影响聚驱效果。常规模糊数学分析方法识别聚驱后优势通道误差较大。以大庆M区块部分井组为例,综合利用灰色关联度和模糊综合评判法对聚驱后优势通道进行识别,再根据油水井间连通关系、相带以及射孔数据进一步明确优势通道发育方向。通过与示踪剂方法测得结果对比,符合率达到92.3%,识别结果准确可靠。该方法可为区块后续调整及挖潜提供指导。

After a long period of the development,during the polymer injection stage,the polymer solution crossflows ineffectively and invalidly along the prevailing channel for the polymer flooding blocks in Daqing Oilfield,thus the flooded effects are seriously influenced. For the conventional fuzzy mathematics analyzing method,there are rather bigger errors. Taking a part of the well groups in Daqing Block M as an example,integrating the grey association degree and fuzzy comprehensive evaluating method,the dominant channel after the polymer flooding were identified.And moreover according to the connected relationships between the producers and injectors,facies belts and perforation data,the development directions of the prevailing channel were further confirmed. By comparing with the tested results by the tracer method,the coincidence reaches 92. 3%,the identified results are accurate and reliable. In a word,the approach can provide a certain guidance for the block subsequent adjustment and potential tapping.