HR: 12:05h
AN: OS42A-08    [Abstracts]
TI: Monitoring Methane Hydrate Growth and Carbon Dioxide Exchange in Porous Media with MRI
AU: * Howard, J J
EM: james.j.howard@conocophillips.com
AF: ConocoPhillips, Geoscience Bldg. BTC, Bartlesville, OK 74004 United States
AU: Stevens, J C
EM: jim.c.stevens@conocophillips.com
AF: ConocoPhillips, Geoscience Bldg. BTC, Bartlesville, OK 74004 United States
AU: Baldwin, B A
EM: berniebwin@aol.com
AF: Green Country Petrophysics, 15210 N. 3960 Rd, Dewey, OK 74029 United States
AU: Graue, A
EM: arne.graue@ift.uib.no
AF: University of Bergen, Department of Physics Allegaten 55, Bergen, N-5007 Norway
AU: Ersland, G
EM: geir.ersland@student.uib.no
AF: University of Bergen, Department of Physics Allegaten 55, Bergen, N-5007 Norway
AU: Husebo, J
EM: jarle.husebo@ift.uib.no
AF: University of Bergen, Department of Physics Allegaten 55, Bergen, N-5007 Norway
AB: The growth of methane hydrates in partial water-filled sandstone pores is monitored with MRI imaging techniques. A series of hydrate growth experiments at 4oC and a pore pressure of 8.3 MPa along with a range of initial water saturations and salinity result in almost complete conversion of the initial water and gas in the pores to a hydrate phase over a relatively short period of time. A series of 3-D MRI images collected during these experiments illustrate patterns of hydrate growth. Calibrated MRI intensity changes that occur during the hydrate growth correlate with methane gas consumption and indicate the quantitative value of the MRI images for extracting rate and volumetric information from these experiments. The addition of liquid carbon dioxide to the pore space results in the release of methane from the hydrate without any appreciable increase in the water signal in the MRI images. The MRI images provide quantitative information on the rates and amounts of methane released during this exchange reaction. The absence of large-scale melting of the hydrate during this exchange has significant implications for carbon dioxide sequestration in natural gas hydrates.
DE: 3004 Gas and hydrate systems
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005