• A benchmarking exercise involving 24 laboratories was organized to measure the permeability of the Grimsel granodiorite • The influence of pore fluid, sample size, pressure sensitivity and methods (steady-state, transient pulse, oscillation) are discussed • The average permeability measured with gas is larger than that measured with liquid
• A benchmarking exercise involving 24 laboratories was organized to estimate the permeability of the Grimsel granodiorite • The microstructures of the Grimsel granodiorite were analyzed and quantified using BIB-SEM, micro-CT scanning, MICP and NMR techniques • Permeability predictions from different models using microstructure data as input parameters are in good agreement with measurements
Compression and extension tests with measurement of permeability and elastic wave velocity were made on two different sandstones. Distinctly different cracking and compaction behavior were observed in the two types of test. Conclusions are drawn for the choice of wellbore orientation and allowable pressures. The results also enable the stress conditions and fracturing in the area around a wellbore to be characterized on the basis of measurements in the same direction of shear and compression wave velocities.
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