Pore-scale X-ray images of steady-state three-phase flow in a water-wet sandstone

Description

This dataset contains segmented X-Ray micro-tomography images, where voxel length was 5.3 um, of a steady-state three-phase flow experiment conducted in a water-wet Bentheimer sandstone. Full details of the experimental setup, procedure and imaging analysis can be found in the paper 'Disconnected Gas Transport in Steady-State Three-Phase Flow Revealed with X-ray Imaging' that is referenced in Related Publications. and supporting material. The steady-state experiment was combined with pore-scale imaging to allow for the simultaneous determination of three-phase relative permeability and local capillary pressures. In the experiment, the impact of a saturation history, where gas fractional flow is first increased (Drainage) and then decreased (Imbibition) with respect to water and oil fractional flows, on three-phase relative permeability is investigated. The three-phase steady-state imaging experiment was performed on a Bentheimer sandstone of diameter 1.26 cm, and length 4.23 cm. The selected sample has a total porosity of 0.24. The absolute permeability (k) of the sample, measured at the experimental conditions, is 1.75 ± 0.03 D (1.73×10-12 ± 0.03×10-12 m2). The experiment was conducted at ambient temperature and pore pressure of 1 MPa. Nitrogen (N2) was used as the gas phase, n-decane (C10H22) as the oil phase, and deionized water (H2O) as the aqueous phase. Both oil and water were doped to enhance their contrast in the pore-scale images. Scans are performed with a Zeiss Versa 510 X-Ray microscope with a flat panel detector and various microscope objectives. There are 12 images in this dataset: 1. A dry scan of the sample 2. A water saturated scan (absolute permeability was measured here) 3. An oil injection scan (primary drainage) 4. A two-phase co-injection of oil and water at fw,o = 0.5. 5. A three-phase co-injection of gas, oil and water at fg= 0.5, and fw,o=0.25 (drainage) 6. A three-phase co-injection of gas, oil and water at fg= 0.75, and fw,o=0.125 (drainage) 7. A gas injection only scan fg=1 8. A three-phase co-injection of gas, oil and water at fg= 0.75, and fw,o=0.125 (imbibition) 9. A three-phase co-injection of gas, oil and water at fg= 0.625, and fw,o=0.1875 (imbibition) 8. A three-phase co-injection of gas, oil and water at fg= 0.5, and fw,o=0.25 (imbibition) 10. A three-phase co-injection of gas, oil and water at fg= 0.375, and fw,o=0.3125 (imbibition) 11. A three-phase co-injection of gas, oil and water at fg= 0.25, and fw,o=0.375 (imbibition) In the segmented images: 1 is water 2 is rock 3 is oil 4 is gas All images are of size 2000x2000x5000 voxels. To obtain the raw grey-scale images, please contact the author directly on Abdulla.alhosani17@imperial.ac.uk.