Page 22 - Enhanced Oil Recovery in Shale and Tight Reservoirs

12 Enhanced Oil Recovery in Shale and Tight Reservoirs

2100

2050

CT Number 2000

1950

1900
Mean CT number for dry core
Mean CT number for saturated core
1850
0 5 10 15 20 25 30 35 40 45
Core Plug Slices
Figure 2.3 CT number comparison between a dry and the oil saturated core.

Figure 2.4 Schematic of the experimental setup for N 2 huff-n-puff tests.

the matrix. Before operating a huff-n-puff test, all valves are closed. The
procedures for one cycle huff-n-puff process are as follows.
1. Open valve V1 and the N 2 cylinder valve to transfer the gas into the
vessel until the system pressure reaches a designed injection pressure;
2. Close valve V1 to have a soaking period;
3. After the soaking period, open valve V2 and set a desired gas outlet flow
rate to reduce the system pressure (linearly) to the atmospheric pressure;