... an experimental procedure that consists of: (1) compaction of organic-rich grains/powder under oedometric conditions, (2) measurement of poromechanical properties in the absence of adsorption effects using helium in a triaxial cell through independent changes of confining pressure and pore pressure, (3...

... of laboratory measurements of shale permeability with helium and CO2 (carbon dioxide) were conducted under hydrostatic conditions. “U-shape” permeability curve was observed in both positive and negative effective stress coefficients. Under negative effective stress coefficient, the permeability is dominated...

... temperature specimens of neat Portland cement to confining pressures (0.7, 2.1, 13.8 MPa) and measured helium flow continuously during triaxial deformation. Axial displacement across a specimen was periodically halted to perhaps assure steady flow rate throughout the sample. We observed the apparent...

... helium coefficient fracture volumetric strain mpa hydrostatic stress solid bulk modulus Upstream Oil & Gas Biot coefficient pore pressure coal sample international journal specimen hydrostatic stress gas ADSORPTION 1. INTRODUCTION The effective stress concept was first introduced...

... Upstream Oil & Gas depletion constant triaxial effective stress boundary condition stress path variation experiment effective stress stress condition harpalani coefficient uniaxial strain condition helium horizontal direction strain condition 1. INTRODUCTION AND BACKGROUND Predicting...

... Oil & Gas helium failure envelope stress path coalbed methane biot-like coefficient experiment MPa effective horizontal stress reservoir geomechanics complex reservoir adsorption stress coefficient total horizontal stress permeability equation 1. INTRODUCTION US coalbed methane...

... Abstract A helium leakage detection system was modified to measure gas permeability on extracted cores of nearly impermeable rock. Here we use a Helium - Mass - Spectrometry - Permeameter (HMSP) to conduct a constant pressure, steady state flow test through a sample using helium gas. Under...

.... Interestingly, CO2 appears to change the constitutive behavior of coal; Helium saturated samples exhibit elastic behavior, while CO2 saturated samples exhibit viscous, anelastic behavior, as evidenced by creep strain observations. The Power River Basin, which extends from eastern Wyoming into southeastern...

... Upstream Oil & Gas pycnometry mineralogy powder Artificial Intelligence helium helium pycnometry grain density determination zeolitic material Reservoir Characterization gas pycnometry air zero zeolite content specimen zeolitized tuff clinoptilolite water pycnometry grain...