玛131井区低渗透砂砾岩油藏水平井优化设计研究

Horizontal Well Optimization and Design of Low-Permeability Glutenite Reservoir in Wellblock Ma131

根据玛北油田玛131井区特低渗透砂砾岩油藏特征,综合油藏工程、数值模拟、经济评价等方法和手段,优化了水平井井网、人工缝网、水平段长度等关键开发参数,形成了特低渗透砂砾岩油藏水平井分段压裂开发优化设计技术。研究结果表明:该区宜采用类五点法井网,合理的裂缝穿透比为0.4,人工裂缝半长为140~160 m,合理井距为350~400 m;水平井合理水平段长度为1 600 m左右;人工裂缝方向应垂直于水平段方向,合理的裂缝间距为80~100 m,最优的裂缝导流能力为40μm^2·cm;在裂缝总长度一定时,采用两端裂缝长、中间裂缝短的不等长裂缝压裂时,采出程度相对较高。研究结果为该区油田开发方案的编制和同类油藏的有效开发提供一定的借鉴意义。

According to the ultra-low permeability glutenite reservoir properties in the Wellblock Ma131 of Mabei Oilfield,reservoir engineering,numerical simulation,economic evaluation and other methods are combined to optimize the horizontal well pattern,artificial fracture network,lateral length and other key development parameters.A horizontal well multi-stage fracturing optimization and design technology is proposed for the ultra-low permeability glutenite reservoir.Research indicates that the five-spot well pattern is recommended in this wellblock.The reasonable fracture penetration ratio is 0.4,the artificial fracture half-length is 140-160 m,the reasonable well spacing is 350-400 m and the optimal lateral length is about 1 600 m.The artificial fracture should be perpendicular to the lateral wellbore.The optimal fracture interval and fracture conductivity are 80-100 m and 40 um-2·cm respectively.The fracture distribution of long fractures at both ends and short fractures in the middle part could gain relatively high recovery degree under fixed total fracture length.This research could provide certain reference for the preparation of oilfield development program and the efficient development of similar oil reservoirs.