ABSTRACT
The tight gas sandstone formation in North Germany
is characterized by an unknown Biot’s Į and Skemp-
ton’s coefficient B, which are normally supposed to
be equal to one (Į=B=1). But this assumption is not
suitable for rocks with such low permeability. These
two coefficients are the hydro-mechanical coupling
parameters and affect the hydro-mechanical interac-
tions. Therefore, the dependence of these coeffi-
cients on stress and rock damage must be studied in
laboratory. The test results will be a basis for a
coupled hydro-mechanical and chemo-mechanical
modeling to analyze the wellbore stability.