A newly developed specialized true triaxial cell for rock mechanical testing is described. The cell allows testing of 46 X 46 x 110 mm box shaped specimens under in-situ reservoir stress conditions. The operating effective stress is up to 100 MPa [14500 psi] in the vertical direction and 50 MPa (7250 psi) in the horizontal direction. The applied stresses may be varied independently in 3 orthogonal directions (true triaxial stress condition) and both the vertical and the 2 horizontal absolute permeabilities are measured. The application of the true triaxial cell is illustrated by 3 selected tests.

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