Compressibility test
This test determines the pore volume compressibility of a rock sample under reservoir condition. The constant stress σ1 simulates the overburden while the radial stress σ3 is controlled in such a way that the radial deformation of the sample is zero throughout the test (uniaxial strain test). A pore pressure is injected and then varied e.g. to simulate the depletion of the reservoir.
The axial deformation of the samples gives the bulk volume change while the squeeze out of the pore fluid gives the pore volume change. Variations of this procedure like testing under a hydrostatic stress condition are also applicable.
The test can be carried out with saturated samples (water, brine, oil) from ambient conditions up to a temperature of 150°C and an operating pressure of up to 140 MPa (σ2 = σ3). Sample dimensions applied so far are length : diameter = 2:1 with specimen diameters of 1” to 2”.
test | σ1 | σ3 | ε1 | ε3 | Pp | measured |
pore pressure variation | constant | f(ε3) | ≠ 0 | = 0 | variable | Δl |
at prevented lateral strain | variable | free | constant |
News
Meet us at the GET 2024
Gesteinslabor will exhibit at the GET2024 in Rotterdam. 4.-7.November 2024, find us at booth 605.
We are looking forward meeting you there!
Gesteinslabor Dr. Eberhard Jahns is project and research partner within the HENRI (Hydrogen Energy Reservoir) project.
Main focus of us is the impact of H2 on the cap rock. Besides other parameters, we determine the capillary threshold pressure with different gases and gas mixtures.
First preliminary results could be presented at the 2nd HENRI conference.
Recently, the article "Determination of capillary threshold pressure with hydrogen gas" was published in the journal EEK.
Article from the journal EEK 01/2023
Gesteinslabor has successfully completed the development of a new test rig to determine the capillary threshold pressure with hydrogen.
Read more … Determination of capillary threshold pressure using hydrogen gas