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.