Phase equilibria in the SACROC oil/CO/sub 2/ system
Journal Article
·
· SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States)
OSTI ID:5409400
Phase-equilibrium measurements on SACROC oil/CO/sub 2/ mixtures show this system to display liquid/vapor (L/V) criticality at a composition of 60 mol% CO/sub 2/ with a pressure of 2,560 psia (17.65 MPa) and a temperature of 131/sup 0/F (328.15 K). In the vicinity of the critical region, liquid quality lines show three- and four-fold pressure multiplicities for a given composition. These multiplicities are a consequence of two effects: (1) the solvent power of supercritical CO/sub 2/ to extract liquid-phase hydrocarbons at pressures below the saturation pressures of the overall mixtures and (2) the sensitivity of the L/V phase distribution to changes in pressure when the saturation pressure of the overall mixture is in the vicinity of its critical point. On a CO/sub 2/-free basis, retrograde liquid produced by flashing CO/sub 2/-enriched reservoir oil at 3,000 psia and 131/sup 0/F (20.68 MPa and 328.15 K) was found to be similar in composition to other west Texas oils. Under conditions of repeated CO/sub 2/ contact, this retrograde liquid was found to revaporize like other west Texas oils.
- Research Organization:
- Amoco Production Co., Tulsa Research Center, OK (US)
- OSTI ID:
- 5409400
- 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
CARBON DIOXIDE INJECTION
CHEMICAL COMPOSITION
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