Cyclic CO sub 2 injection for light oil recovery: Performance of a cost shared field test in Louisiana. Fifth quarterly report, November 22, 1989-February 21, 1990

The technology was used for handling heavy aging oil by demulsifier and three phases horizontal scrow centrifuge. Through laboratory and field test, it showed that the water content of the processed aging oil dropped from 50% to 5% below, purity oil recovery rate reached more than 95%, meeting export quality requirements. The technology improved the effective storage capacity of flow station, is of great significance to the safe and steady operation of flow station.

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The Mechanism of Flue Gas Injection for Enhanced Light Oil Recovery

Journal of Energy Resources Technology ◽

10.1115/1.1725170 ◽

2004 ◽

Vol 126 (2) ◽

pp. 119-124 ◽

Cited By ~ 6

Author(s):

O. S. Shokoya ◽

S. A. (Raj) Mehta ◽

R. G. Moore ◽

B. B. Maini ◽

M. Pooladi-Darvish ◽

...

Keyword(s):

Oil Recovery ◽

Flue Gas ◽

Gas Injection ◽

Cost Effective ◽

Air Injection ◽

Oil Reservoirs ◽

Flue Gases ◽

Low Permeability ◽

Light Oil ◽

Light Oil Reservoirs

Flue gas injection into light oil reservoirs could be a cost-effective gas displacement method for enhanced oil recovery, especially in low porosity and low permeability reservoirs. The flue gas could be generated in situ as obtained from the spontaneous ignition of oil when air is injected into a high temperature reservoir, or injected directly into the reservoir from some surface source. When operating at high pressures commonly found in deep light oil reservoirs, the flue gas may become miscible or near–miscible with the reservoir oil, thereby displacing it more efficiently than an immiscible gas flood. Some successful high pressure air injection (HPAI) projects have been reported in low permeability and low porosity light oil reservoirs. Spontaneous oil ignition was reported in some of these projects, at least from laboratory experiments; however, the mechanism by which the generated flue gas displaces the oil has not been discussed in clear terms in the literature. An experimental investigation was carried out to study the mechanism by which flue gases displace light oil at a reservoir temperature of 116°C and typical reservoir pressures ranging from 27.63 MPa to 46.06 MPa. The results showed that the flue gases displaced the oil in a forward contacting process resembling a combined vaporizing and condensing multi-contact gas drive mechanism. The flue gases also became near-miscible with the oil at elevated pressures, an indication that high pressure flue gas (or air) injection is a cost-effective process for enhanced recovery of light oils, compared to rich gas or water injection, with the potential of sequestering carbon dioxide, a greenhouse gas.

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