Formation pressure distribution of non-Darcy flow in low permeability reservoir differs from Darcy flow in custom reservoir,and there are non-startup regions uncontrolled by single well.Based on mass conservation and momentum equations in theory of fluid mechanics in porous medium,the non-Darcy flow mathematic model considering threshold pressure gradient is established,which derives analytic solution of non-Darcy radial flow and deliverability equation.A new calculation method of formation pressure is presented,which provides theoretical foundation for reservoir evaluation and development design of low or ultra-low permeability reservoir.The calculation results demonstrate that there is not exciter response everywhere of non-Darcy flowing in low permeability reservoir which differs from Darcy flowing in custom reservoir.Energy decay rate of non-Darcy flowing in low permeability reservoir is faster than Darcy flowing in custom reservoir.Because of small spreading range,it exists reasonable employing radius.
国家科技期刊平台
NSTL
万方数据
