CO2 fluid flow testing
NGI's has a specialized set-up with a pressure vessel and controllers inside a heat cabinet for testing of CO2 flow through cores at controlled temperature and pressure conditions. NGI also utilizes other equipment in the research related to CO2 storage.
Capabilities of the CO2 fluid flow set-up
- Temperature and pressure capabilities allowing supercritical CO2 flooding of rocks cores
- Internal, local axial and radial deformation can be measured.
- High precision pressure controllers inside the heat cabinet allow for multiphase flow (other fluids than CO2 can be tested as well)
- Isotropic cell with radial confinement up to 30 MPa
- Measurement of axial and radial ultrasonic P & S- wave velocities and electrical resistivity
- Flow experiments to establish rock physics relationships of P & S- wave velocity and resistivity during fluid substitution
Figure: Heat cabinet with isotropic cell and pressure controllers (left), sleeve for radial measurements of ultrasonic velocity and electrical resistivity (middle), and principle sketch showing the various directions for rock physics measurements (right)
Other NGI setups are also used actively in research related to CO2 storage, examples including;
- Direct shear test, for determination of frictional properties and fluid flow along fractures and faults for seal integrity evaluations
- Triaxial test in CT-scanner, CT imaging during triaxial test and/or CO2 flooding to visualize fluid substitution/deformation and measure geophysical data for monitoring purpose (seismic and EM)
- Acoustic emission, to evaluate potential of induced seismicity for micro seismic monitoring purpose.