The maximum effective hole diameter mathematical model describing flow of sligh+tly compressible fluid through a three layer crossflow reservoir is solved rigorously with consideration of wellbore storage and different skin factors.

Under the impulse of coalseam pore pressure gradient in multi-coalseam system,migration and emission of coalbed gas nearby layer will be across the weak permeability dissection to mining coalbed coal face、goaf or gas production drillhole,which formed multi-coalseam system coalbed gas crossflow.

In this paper,in consideration of leakage and the impervious boundary on one side of a confined aquifer,a method for determinin.

On the basis of the study of geophysical prospecting log curve and dynamic curve of groundwater level, it is found that deep zone pores fresh groundwater receives the leakage recharge from its upper saline underground water in Huabei Plain.

The impervious boundary is dis-turbed easily, which results in a profound leakage between differe.

The nonsteady radial flow surrounding a pumping well in a fully confined or leaky confined aquifer will induce the bending of confining unit, and then the radial flow patterns are affected by the bending effect through reducing of total stress.