特高含水后期油藏水驱效果评价方法

针对常规水驱效果评价方法不适用于特高含水后期油藏的问题,通过筛选指标、确定指标权重和确立指标标准,研究了新的评价体系。利用逻辑分析、矿场统计和灰色关联分析等方法,从常用水驱效果评价指标中筛选出适合特高含水后期的12项指标,根据石油天然气行业标准《油田开发水平分级》(SY/T 6219—1996),结合矿场统计数据,制定了各项评价指标的标准,应用层次分析法确定了各项指标的权重,并采用模糊综合评判法评价水驱效果,形成了特高含水后期油藏水驱效果评价方法。应用实例表明,与传统方法相比,该评价方法简单快捷,结果较为准确,具有较好的现场实用价值。

Evaluation Method of Water Flooding Effect in Reservoirs with Ultra-High Water Cut

This study addressed problem that the conventional evaluation method of water flooding effect was not suitable for late-stage production in reservoirs with ultra-high water cut, a new evaluation system was studied by selecting indices, determining index weight and establishing an index standard. Firstly, with logical analysis, oil field statistics, and other methods, the team selected 12 suitable indicators for the late-stage high water-cut production from the commonly-used water flooding evaluation indicators. Secondly, standards for various indicators were formulated by integrating “Oilfield Development Level Classification” (SY/T 6219—1996) and oil field statistics. The weight of each indicator was determined by applying an analytic hierarchy process. Finally, the fuzzy comprehensive evaluation method was used for evaluation. In this way, a water flooding effect evaluation method was established for oil reservoirs in the late-stage period of ultra-high water cut. Relevant analogs verified that this evaluation method was relatively accurate, simple and a valuable field practice compared with traditional methods.