Fluid injection test, long time

The conditions on the pore pressures for the long duration, single porosity limit for the three-dimensional storage compressibility S are $\delta p_f^{(1)} = \delta p_f^{(2)}= \delta p_f$, while the confining pressure remains constant. It follows therefore that

S . p_f|_p_c = 0 = a_22+a_23+a_32+a_33.  

This completes the main analysis of the elastic coefficients for double porosity. Further details may be found in Berryman and Wang [1995].

TABLE 1. Material Properties

Barre Bedford Parameter

^aFrom Coyner [1984]