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目前现场广泛采用关井测压试井方法获得地层压力及地层参数 ,但在气井中往往遇到困难 ,有些超高压气井关井后井口压力很高 ,井内管柱和井口装置都难以承受 ,对于低渗透气层关井常常需要数周时间 ,才能获得满意的压力恢复曲线资料 ,对产能影响较高。针对这一问题 ,提出通过不关井只改变工作制度的方法使产量改变 ,测取井底压力的数据变化 ,运用多孔介质气体不稳定渗流理论 ,得出基本方程 ,通过计算拟合确定油气藏的目前平均地层压力、地层有效渗透率和表皮系数等气藏参数
Nowadays, the pressure and well parameters of formation shut-in are widely used to obtain formation pressure and formation parameters. However, gas wells often encounter difficulties. Some wells have high wellhead pressure after shut-in and are unbearable for well strings and wellheads. Low-permeability gas shut-in often takes several weeks to obtain satisfactory pressure recovery curve data, a higher impact on productivity. In response to this problem, we propose to change the production by changing the working system without shutting down the well and change the data of the bottom hole pressure. Based on the theory of unsteady seepage of gas in porous media, we get the basic equation and determine the reservoir by calculation The current average formation pressure, effective permeability and epidermal coefficient reservoir parameters