Radiofrequency ablation is generally effective and safe in treating recurrent HCC after hepatectomy and is more effective in late recurrence than in early recurrence.
Injecting
CO2 into deep coal seams is key to successful
CO2 sequestration and enhancing coalbed methane production;
however, various underground conditions influence the process. In
this study, experiments were conducted to determine optimum conditions
for replacing CH4 with CO2 injection at different
temperatures (20, 30, and 40 °C), pressures (2, 3, and 4 MPa),
and supercritical conditions (35, 45, and 55 °C). The results
show that the proportion of adsorbed CH4 decreased with
decreasing desorption pressure but increased with increasing temperature.
Low temperatures were relatively more conducive to replacing CO2 with CH4. With an increase in the original CH4 adsorption equilibrium pressure, there was an increase in
CH4 adsorbed proportion but a decrease in CO2 adsorbed concentration. Desorption rates showed that the replacement
effect was superior under low original reservoir pressures. Under
supercritical conditions, the maximum Gibbs adsorption volume for
CO2 was obtained, and the absolute adsorption volume conformed
to classical Langmuir curves. During the replacement process, the
percentage of adsorbed CO2 increased with increasing temperature,
while the concentration of CH4 decreased. The CH4 desorption rate was higher, and the displacement effect was superior
when temperature and pressure were close to the critical condition
within the supercritical range.
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