低渗透油田水驱开发效果模糊综合评价

Application of Fuzzy Mathematics for Effect Evaluation of Water Flooding Development in Low Permeability Oilfield

为了准确认识低渗透油田的开发规律、开发状况,运用模糊理论,针对采出程度比、综合递减率、含水上升率、采油速度、存水率、耗水率等6个指标进行综合评价。采用层次分析法确定各个指标的权重系数,应用模糊综合评判法对开发效果进行综合评价,从而克服了当前普遍采用的简单评价的局限性,既可方便地看出各指标因素的影响大小,指导进一步挖潜,又有利于横向对比,针对不同区块采取不同措施方案。以X油田试验区为例进行了分析,有效地指导后续开发工作,同样对其它同类型油藏提高采收率研究具有重要的指导意义。

In order to accurately recognize the development law and situation of low permeable oil fields,the paper makes a comprehensive evaluation with the fuzzy theory in terms of such six indexes as the recovery degree ratio,composite decline rate,water cut rising rate,oil production rate,water storage rate,and water consumption rate.Each index’s weight coefficient is determined by adopting analytic hierarchy process and the comprehensive evaluation of the development effect is made with the method of fuzzy comprehensive evaluation,which overcomes the limitations of the current commonly-used simple evaluation method.The method adopted in the paper can not only be convenient to see the influence size of each index factor and further guide the potential tapping but also be easy to make horizontal comparison and take different measures for different blocks.An analysis is made by taking the test area of the certain oilfield as an example,which effectively guides the subsequent development work and has important guiding significance in improving recovery factor research of other reservoirs of the same type.