Experimental study on gas permeability of mudstones

Characterization of the hydromechanical behavior of argillaceous rocks with effective gas permeability under deviatoric stress

“…Based on the principle of 'pulse test' (Billiotte et al, 2008;Le Guen and Billiotte, 1993), an experimental equipment of gas permeability measurements has been designed and developed in the GIG/Geosciences laboratory. 1.…”

“…The precision of the system has been evaluated at about 10 − 22 m² with a cylindrical metal sample, which is 4 times greater than the recorded pressure noise related with the leakage of system, gas bypassing between sample and sealing and temperature fluctuations (Billiotte et al, 2008). In this study, argon has been chosen as inert gas during tests, because its greater molecule mass could effectively decrease the magnitude of potential leakages.…”

“…The amplitude of shrinking could reach up to 1% while the argillaceous rocks desaturated down to 40%. Cracking and re-opening of micro-fractures were observed in the laboratory and in field, where the argillaceous rocks were undergone a resaturation and desaturation cycles (Billiotte et al, 2008;Valès, 2008;Ramambasoa, 2001). The kinetic evolution is controlled by the water and gas permeability of the rock, and also is a coupled hydro-mechanical problem.…”

Determining the permeability of tight rock with gas transient flow

“…Homand et al (2004) applied the modified pulse test proposed by Hsieh et al (1981) to characterize permeability of low permeable rocks. Billiotte et al (2008) used transient pulse technique to measure permeability measurements of mudstones. They observed that the gas permeability is decreasing with an increase of confining stresses due to the closing of some micro fissures in samples.…”

An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock

“…A series of experimental studies including mechanical behavior investigations and microstructure analysis of various kinds of soft rocks has been performed [1][2][3][4][5][6][7][8][9][10][11][12]. The results have shown that the mechanical behavior of the soft rocks after saturation is very complex and is characterized by various features such as elasto-plasticity, strain hardening, and performance deterioration.…”