Page 487 - Enhanced Oil Recovery in Shale and Tight Reservoirs

Air injection 451

(A)
110
105
Temperature, o C 95 Temp_Air inj_base
100

90
Temp_Air inj_low Ea and high Ar
85
Temp_Air inj_adiabatic
80

75
0 5 10 15 20 25
(B) PV of gas injection

70
60
50

40
RF RF_Air inj_base
30
RF_Air inj_low Ea and high Ar
20
RF_Air inj_adiabatic
10
0
0 5 10 15 20 25
PV of gas injection
Figure 13.27 Effect of kinetic data and adiabatic condition on (A) reservoir average
temperature and (B) oil recovery factor.

models do not show the temperature increase (almost invisible); but lower
5 1
activation energy (20 kJ/mol) and a higher frequency factor (10 s )resulted
in 25 C increase. During the isothermal experiments discussed in the preced-

ing section, it was observed that there was a 1e2 Cdifference in the

measured temperatures or no difference with and without adiabatic materials
used. These simulation results and experimental observations seem to indicate
that the absence of thermal effect was not caused by the heat loss in laboratory
conditions, but rather attributed to the lack of crude oil exothermic activity
(e.g., high activation energy and low frequency factor).