Investigation of flue gas displacement and storage after the water flooding in a full diameter conglomerate long-core
Haishui HAN,Shi LI,Desheng MA,Zemin JI,Hongwei YU,Xinglong CHEN
Table 4 Experiment schemes.
No. Experiment content Scheme 1 Scheme 2
1 Saturate the core with water, measure pore volume of spliced core Temperature of 42 °C, Pressure of 15.02 MPa Temperature of 42 °C, Pressure of 15.02 MPa
2 Saturate the core with oil to simulate bound water Temperature of 42 °C, Pressure of 15.02 MPa Temperature of 42 °C, Pressure of 15.02 MPa
3 Age the oil saturated core for one month Temperature of 42 °C, Pressure of 15.15 MPa Temperature of 42 °C, Pressure of 15.15 MPa
4 Depletion development Pressure dropped from 15.15 MPa to 8.11 MPa Pressure dropped from 15.15 MPa to 8.11 MPa
5 Water flooding Outlet pressure kept at 8.22 MPa,
stopped until water cut was 100%
Outlet pressure kept at 8.22 MPa,
stopped when recovery was 24.79%
6 Increase pressure by flue gas Increased pressure to 12 MPa
7 Continuous flue gas flooding Outlet pressure kept at 8.22 MPa, stopped when there was no oil and little liquid produced
8 Flue gas-water alternative flooding At the outlet pressure of 8.22 MPa and injected gas-water ratio of 2∶1, the flooding stopped when only gas was produced, with 5 cycles in total At the outlet pressure of 12 MPa and injected gas-water ratio of 2:1, the flooding ended when
only gas was produced, with 8 cycles in total
9 Continuous flue gas flooding At the outlet pressure of 12 MPa, the flooding
stopped when only gas was produced with a
total injection volume of 7 times HCPV
10 Storage Till pressure increased to 20 MPa
11 CO2 flooding At the outlet pressure of 8.22 MPa, the flooding ended when only gas was produced
12 Continuous injection of flue gas At the outlet pressure of 8.22 MPa, H2S content of produced gas was measured