Shale gas reservoir study of unstable pressure propagation

Shale gas reservoirs have become a new bright spot in the global oil and gas exploration.The geological characteristics and reservoir shale gas special pressure,propagation and influence of shale gas reservoir is not stable and did not fully understand.In this paper,considering starting pressure gradient and occurrence of shale gas reservoirs,composite model,by solving the non-homogeneous virtual Bessel function of shale gas reservoirs,complex mathematical model of bottom hole pressure model,analyzes the shale gas unsteady pressure propagation law,the influence of shale gas reservoirs in the area of wellbore storage coefficient,permeability the permeability,skin factor,region,starting pressure gradient,desorption compression coefficient and gas production factors.Shale gas reservoir with low permeability of the composite region,wellbore storage coefficient,permeability,permeability of inner zone region,inner region radius and the desorption coefficient of compressibility is a sensitive factor.