基于地应力场的井网优化设计方法研究

The well pattern optimization design method based on the earth stress field

在调研国内外特低渗透油田井网部署现状的基础上,结合大庆油田现有井网开发实际,分析影响大庆外围特低渗透油藏开发效果的主要因素。通过设计不同井网系统参数与人工裂缝参数的组合方案,使用油藏数值模拟方法,对各种不同裂缝组系(在有利扫油方位)与井网的组合关系所预测的单井产量、含水、采出程度,以及所预测的投资回收期等进行综合衡量,获得井排距与水力裂缝缝长、导流能力等匹配的最佳方案。压裂、注水、采油整体优化方法在大庆肇源油田源121区块应用,取得了较好的效果。

Based on the study of ultra - low permeability well pattern deployment in foreign countries, and with the combination of the practical exploitation in Daqing oilfield, this paper analyzes the major factors which influence the development effect of the ultra -low permeability oil pool in the periphery of Daqing oilfield. Through the combination design of different well pattern and artificial fracture parameters, and based on reservoir numerical simulation, it also analyzes the individual well output, water cut and reserve recovery degree along with investment payback time, which are predicted from the combinatory relationship of different fracture groups （on favorable swept horizon）. Through the comprehensive measurement of the above factors, the optimum project, in which well array distance matches well with hydraulic fracture length and flow conductivity, is determined. The integral optimization method of fracturing, water flooding and oil produc- tion has been applied in Block Yuan 121 of Daqing Zhaoyuan oilfield with favorable development effect.