基于变权评判方法的底水油藏水平井堵水决策研究

Study on horizontal well water plugging decision of bottom water reservoir based on variable weight evaluation method

针对底水油藏水平井堵水的选井问题,考虑水平井水淹有重要影响的地质因素和开发因素,建立了底水油藏水平井堵水决策指标体系。利用不确定性表示方法,对各指标进行量化表征,应用模糊数学综合评判技术建立堵水井选择的最优化模型,根据变权多因素多级决策结果,判断堵水井选择次序,筛选出合适的堵水井。实例计算结果表明:该方法能够综合考虑影响油井水淹的各因素,规避奇异因素对选井决策的影响,使堵水井的选择更加科学合理。

Aiming at the well selection problems of the horizontal well water plugging of the bottom water reservoir, water plugging decision index system was established with the geological factors and the development factors seriously influencing the flooding of horizontal wells considered. Uncertainty representation method was used to quantitatively characterize each index. Water plugging well selection optimizing model was selected by the fuzzy mathematical comprehensive evaluation technology. According to the results of variable weight multi-factor and multistage decision, water plugging well was selected by judging the order of preference. Calculation results of examples showed that this method can avoid the influence of singular factors on well selection by comprehensively considering all factors influencing the flooding of wells and make the water plugging well selection more scientific and reasonable.