A kinetic model of CO sub 2 generation and mineral and isotopic alteration during steamflooding
- Cornell Univ., Ithica, NY (US)
- Chevron Oil Field Research (US)
CO{sub 2} is commonly produced during steamflooding. In higher-temperature steamfloods the amount of CO{sub 2} produced is such that the only viable source is carbonate minerals. The authors show by reference to CO{sub 2} concentrations in natural geothermal systems that in most common rocks and sediments, CO{sub 2} is generated naturally under hydrothermal ({approximately}572{degrees}F) conditions by the dissolution of carbonate minerals. CO{sub 2} solubility is a strong positive function of temperature and, at 572{degrees}F, is more than sufficient to account for high CO{sub 2} concentrations like those encountered in a steamflood pilot test. A linear kinetic model is developed to describe chemical equilibration and CO{sub 2} generation in the hot parts of the reservoir. The model also describes CO{sub 2} removal through carbonate precipitation in the cooler parts of the rock formation where the fluid moves ahead of the thermal front. Changes in carbon isotope concentration are included in the model. The small difference between the {sup 13}C in the produced gas and the source carbonates suggests that little CO{sub 2} is precipitated as carbonate within that reservoir, a prediction that can be tested by poststeamflood coring.
- OSTI ID:
- 6088615
- Journal Information:
- SPE (Society of Petroleum Engineers) Reservoir Engineering; (USA), Vol. 5:4; ISSN 0885-9248
- Country of Publication:
- United States
- Language:
- English
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15 GEOTHERMAL ENERGY
07 ISOTOPES AND RADIATION SOURCES
CARBON DIOXIDE
PRODUCTION
CARBON ISOTOPES
ISOTOPE RATIO
CARBONATES
DISSOLUTION
OIL WELLS
STEAM INJECTION
CARBON 13
CHEMICAL REACTION KINETICS
DRILL CORES
GEOTHERMAL SYSTEMS
ROCK-FLUID INTERACTIONS
TEMPERATURE DEPENDENCE
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
EVEN-ODD NUCLEI
FLUID INJECTION
ISOTOPES
KINETICS
LIGHT NUCLEI
NUCLEI
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
STABLE ISOTOPES
WELLS
020300* - Petroleum- Drilling & Production
152003 - Geothermal Data & Theory- Rock-Water-Gas Interactions
070204 - Radiation Sources- Industrial Uses
Radiometric