特低渗透裂缝型储层注水开发中后期地应力场变化及开发对策

从特低渗透裂缝型储层油田开发实践中暴露出来的问题入手，从理论上研究了注水开发中后期地下储层水平应力场“均一化”的发展趋势，认为注水开发中后期井区局部视水平最小主应力，随着注水开发周期的延长将会无限接近水平最大主应力。在此基础上描述了特低渗透储层发育天然裂缝和不发育天然裂缝时注入水的流动规律。最后根据水平应力场注水开发中后期“均一化”理论，提出针对特低渗透裂缝储层注水开发中后期的调整对策。此项技术在大庆头台油田茂11区块进行应用，取得了比较好的调整效果，并对同类油田开发具有重要指导作用。

Changes of Ground Stress Field and Development Policy in Later Half Period of Water Injection for the Extremely Low Permeability Reservoirs with Fractures

This article researches the reservoir's horizontal stress field uniform trends in the later half period of water flood on theory,based on the problems facing in developing the extremely low permeability reservoirs with fractures.The authors come to the conclusion that the regional minimum apparent horizontal principal stress at the stage of later half period will be close to the horizontal maximum principal stress as the cycle extending of water flooding.The injecting water flow laws of the extremely low permeability reservoirs with and without fractures are described in the paper.Water injection adjustment of the extremely low permeability reservoir is put forward according to the theory of uniform on horizontal stress field.The adjustment has been tested in Mao 11 well district in Toutai Oilfield in Daqing,which has a good benefit and will have guidance to the same kind of oil field.