Experimental and Simulation Studies of Sequestration of Supercritical Carbon Dioxide in Depleted Gas Reservoirs

Abstract

Experimental, analytical, and simulation studies have been conducted to evaluate the feasibility of sequestering supercritical CO 2 in depleted gas reservoirs. The experimental runs involved the following steps. First, the 1 ft long by 1 in. diameter carbonate core is inserted into a viton Hassler sleeve and placed inside an aluminum coreholder that is then evacuated. Second, with or without connate water, the carbonate core is saturated with methane. Third, supercritical CO 2 is injected into the core with 300 psi overburden pressure. From the volume and composition of the produced gas measured by a wet test meter and a gas chromatograph, the recovery of methane at CO 2 breakthrough is determined. The core is scanned three times during an experimental run to determine core porosity and fluid saturation profile: at start of the run, at CO 2 breakthrough, and at the end of the run. Runs were made with various temperatures, 20°C (68°F) to 80°C (176°F), while the cell pressure is varied, from 500 psig (3.55 MPa) to 3000 psig (20.79 MPa) for each temperature.An analytical study of the experimental results has been also conducted to determine

Enhanced gas recovery with CO2 sequestration: The effect of medium heterogeneity on the dispersion of supercritical CO2–CH4

“…Even though the flow of incompressible fluids through carbonate rocks has been broadly investigated, very few dispersion measurements have been conducted on gas-gas systems in carbonates (Batycky et al, 1982;Legatski and Katz, 1967;Mamora and Seo, 2002;Seo, 2004). Legatski and Katz (1967) initiated the gas-gas dispersion measurements in carbonate cores by conducting pulse dispersion experiments at ambient conditions and various interstitial velocities.…”

“…Seo and Mamora (Mamora and Seo, 2002;Seo, 2004;Seo and Mamora, 2005) measured breakthrough profiles for CH 4 displacement by CO 2 through a carbonate core at temperatures between 20 and 80°C and pressures between 3.5 and 20.5 MPa. The repeatability of the measured breakthrough profiles was limited due to the manual back pressure regulator used to control the core pressure (Seo, 2004).…”

“…The repeatability of the measured breakthrough profiles was limited due to the manual back pressure regulator used to control the core pressure (Seo, 2004). Several long-tailed breakthrough curves were observed during the course of their work and their attempts to appropriately regress these long-tailed profiles to the 1D-AD equation failed (Mamora and Seo, 2002;Seo, 2004).…”

Experimental and analytic studies to model kinetics and mass transport of carbon dioxide sequstration in depleted carbonate reservoirs

“…9,14,15 A summary of the experimental results is presented in Table 2, and will be used as a reference to compare flue gas displacement efficiency reported in this paper with that of pure CO 2 .…”

Phase behavior of SCCO2 sequestration and enhanced natural gas recovery

“…Published basic research on CSEGR simplifies real natural gas as pure CH 4 (Mamora and Seo 2002;Seo and Mamora 2003;Oldenburg 2003;Nogueira and Mamora 2005;Turta et al 2008). Such research suggests that SCCO 2 and natural gas should not completely mix in the reservoir during the gas migration.…”