基于模糊综合评价的压裂层优选的改进方法研究

Study on Improved Method of Fracturing Layers Optimization Based on Fuzzy Comprehensive Evaluation

在油井压裂层优选以及压后产能预测的过程中都普遍存在不确定性、准确度低等问题,因此利用现有压裂层产油观测数据,基于模糊综合评价方法,对目标区块油井压裂选井选层方法以及压后产能预测方法进行了深入的研究。提出了一种新的综合权重分析法,来弱化求解误差,并与其它现有方法相互对比反映其准确程度及区分程度。以大庆油田压裂井小层年增油量的预测进行实际分析,得到压裂层评选结果,并将优选层投入现场进行压裂,实际效果较好,展示了该改进方法的简单性与优越性。

The problems of uncertainty and low accuracy in the process of fracturing layer optimization and productivity prediction always exist. Therefore, based on fuzzy comprehensive evaluation and the existing oil fracturing layers data, how to select fracturing layers and oil well in the target block was deeply researched as well as the prediction method of production capacity after the fracture. A new comprehensive weight analysis method was applied to reduce the error in the solution. This method was compared with other methods to expose its accuracy and distinctiveness. Taking the forecast of annual oil increment of those fractured well sublayers in Daqing oilfield as an example, final choice of fracturing layers was obtained. Then fracturing of selected layers was carried out. The practical result was good, which revealed simplicity and superiority of improved method.