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Investigations on damage and healing of rock salt
Published in Manfred Wallner, Karl-Heinz Lux, Wolfgang Minkley, H. Reginald Hardy, The Mechanical Behavior of Salt – Understanding of THMC Processes in Salt, 2017
To avoid additional uncertainty, the gas pulse tests are performed with nearly always the same “mean gas pressure for regular permeability pulse tests”, i.e. PE ≈ 0.2 MPa, see Figure 9, which makes a Klinkenberg correction unnecessary. () pE=(p1⋅V1+p2⋅V2)/(V1+V2).
Laboratory core investigations of sandstone-hosted uranium for in situ recovery
Published in Applied Earth Science, 2020
Micha Zauner, Andreas Weller, Matthias Halisch
For selected samples, absolute gas permeability has been measured by using a so-called steady state gas permeameter with nitrogen as flow fluid. Measurements have been conducted under ‘ambient conditions’, i.e. low overburden pressures (12 bar = 174 psi) by using a special Fancher-type cell as described by Rieckmann (1970). Reservoir, i.e. overburden pressure conditions, has not been applied due to the ‘fragile’ nature of the sample material. Apparent permeability data have been Klinkenberg corrected. Both, steady-state permeametry, as well as the Klinkenberg correction, are described in detail within the Recommended Practices for Core Analysis Guideline RP 40 (API 1998).
Transport property evolution during hydrostatic and triaxial compression of a high porosity sandstone
Published in European Journal of Environmental and Civil Engineering, 2023
Cong Hu, Franck Agostini, Frédéric Skoczylas, Laurent Jeannin, Patrick Egermann, Yonggang Jia
This protocol does not take into account the Klinkenberg correction, but as the samples tested exhibit high permeability values, the expected corrections are likely to be far lower than the permeability variations observed due to loading evolutions. Therefore, it does not bias the results significantly.