Diffusion of CO/sub 2/ at reservoir conditions: Models and measurements
Mathematical models are developed to describe the transport of dissolved CO/sub 2/ in a liquid phase, and results of measurements of the diffusivity of CO/sub 2/ in hydrocarbons and water at reservoir conditions are reported. The measurements were made with novel techniques based on the direct observation of the motion of an interface caused by the diffusion of CO/sub 2/ through oil or oil shielded by water. Diffusion coefficients were determined by fitting the mathematical models to the observed motion of the interfaces. This method allows the measurement of diffusion coefficients without the need to determine phase compositions and is therefore suited to measurements at elevated pressures (reservoir conditions). Measured diffusion coefficients are reported for CO/sub 2/ in pentane, decane, and hexadecane at 25/sup 0/C (77/sup 0/F) and pressures up to 6000 kPa (870 psia)). Limited measurements of CO/sub 2/ diffusion in Maljamar crude oil are also described. In addition, results of measurements for the diffusion of CO/sub 2/ in water are presented. These are the first such measurements at high pressures (up to 6000 kPa (870 pisia)). Correlations of diffusion coefficients in liquids at atmospheric pressure are shown to give reasonable estimates of diffusion coefficients for CO/sub 2/ in fluids at reservoir conditions. Finally, the measured diffusion coefficients and mathematical models are used to assess the impact of diffusive mixing on CO/sub 2/ floods at various length scales to examine the relationship between laboratory-scale corefloods and field-scale displacements.
- Research Organization:
- Ampol Exploration Ltd. in North Sidney (AU)
- OSTI ID:
- 5409399
- Journal Information:
- SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States) Vol. 3:1; ISSN SREEE
- Country of Publication:
- United States
- Language:
- English
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020300* -- Petroleum-- Drilling & Production
ALKANES
AUSTRALASIA
AUSTRALIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE INJECTION
CARBON OXIDES
CHALCOGENIDES
DECANE
DIFFUSION
DISPLACEMENT FLUIDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
GROUND WATER
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
LIQUEFACTION
LIQUEFIED GASES
MATHEMATICAL MODELS
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENTANE
PETROLEUM
RECOVERY
SOLUBILITY
STIMULATION
THERMOCHEMICAL PROCESSES
WATER
WELL STIMULATION
WELLS