应用重复试井资料研究注水压力保持界限

通过大港北区自喷期19口井90层次不稳定试井重复测试资料，应用经典的Homer方法计算表明：有效渗透率随地层压力降低而减小，随压力稳定而基本稳定，渗透率与地层压力为指数函数，饱和压力上下规律不同，阐述了其诱因。结合马西深层开发实践，确定地饱中值附近为最佳压力保持界限。给出两相计算公式，回归了水、气相渗透率分别与含水率和气油比之函数关系。

The research on pressure maintenance limits of water injection by using repeated well testing data

Baesd on the repeated testing data of the unstable well testing of 90 layering of 19 wells in natural flow period of north- ern Dagang area and combined with the calculation results by classic Homer method, this paper found that： effective permeability droped when formation pressure decreased and kept steady when the pressure was steady; the relationship between permeability and formation pressure was exponential function; the laws of upper and lower part of saturation pressure were different, and the in- centives of the differences were also described in this paper. Combined with the deep development practices in Maxi, it was pro- posed that the optimum pressure maintenance limits were around the middle value of formation saturation. The article also put for- ward two-phase calculation formulas and concluded the functions between water phase permeability and water cut ratio and be- tween gas phase permeability and gas/oil ratio respectively.