安棚低渗透油藏水淹特征及控制因素分析

生产井强水淹导致安棚浅中层系低渗透油藏整体开发效果变差。通过对生产井见水响应特征的分析及安棚地应力场、天然裂缝和压裂裂缝的综合研究,认为安棚地区最大水平主应力方向为北东向,而并非先前认为的东西向;现有注采井网与天然裂缝不匹配是造成目前生产井见水的主要原因。这些认识为油藏下步开发部署提供了调整方向。

Waterflooding Characteristics and Control Factor Analysis of Anpeng Low Permeability Reservoirs

The development effect of the shallow-middle layer system in Anpeng lowpermeability reservoir became poor because great majority of producing wells were at high water-cut stage. Through analyzing breakthrough characteristics of producing wells and a comprehensive study of in-situ stress field, natural fracture and induced fracture in Anpeng Region, the conclusions indicate that the direction of maximum horizontal principal stress should be directed towards the north-east rather than towards east-west; the current flooding pattern not matching with the natural fractures is the main reason of breakthrough. And this understanding reorientates the next development of the reservoirs.