Fluids and Rocks - Introduction to Carbon Capture and Sequestration - page 428

Question 9.7.2 Brine imbibition in a capillary network
The two branches shown in the fi gure are capillary tubes with the same length
and different diameters. Does brine (blue) imbibe more rapidly in the narrower
tube, in the broader tube, or at the same rate in both tubes?
Figure 9.7.4 Brine imbibition in a sandstone core sample
X-ray CT images of CO 2 saturation during brine imbibition in a core sample (14.5 cm
long, 3.68 cm in diameter) of Tako sandstone at 40°C and 10 MPa. The fi gure in the
upper left corner shows the initial state of the sample after invasion by CO 2 . The other
fi gures show CO 2 saturation in the core sample after fl ushing by up to 17.9 pore vol-
umes of brine. After about one pore volume of brine has been fl ushed through the
sample, CO 2 saturation stabilizes at S g,r ∼ 0.3. Image reproduced from Shi et al. [9.24] ,
with permission from Elsevier.