Liquid addition to steam for enhancing recovery of cyclic steam stimulation or LASER-CSS
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United States of America Patent
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Mar 23, 2004
Grant Date -
Oct 10, 2002
app pub date -
Apr 2, 2002
filing date -
Apr 4, 2001
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Abstract
LASER-CSS provides a method to improve cyclic steam-based thermal recovery methods for heavy oils and bitumen. A key improvement over prior art consists of mixing liquid hydrocarbons into the injected steam instead of injecting such hydrocarbon as a separate slug in front of a steam stimulation cycle. The objective of the invention is to enhance field applications of Cyclic Steam Stimulation (CSS) by contacting and mobilizing more of the bitumen with the same amount of steam. This is to help increase the recovery efficiency and ultimate recovery normally achieved with conventional CSS-type process operations. The proposed LASER-CSS method utilizes existing CSS wells at some intermediate stage of reservoir depletion. Liquid hydrocarbons are directly mixed and flashed into the injected steam lines, injected into the CSS wellbores and further transported as vapors to contact heavy oil or bitumen surrounding steamed areas between adjacent wells. For the most part injected hydrocarbons are reproduced dissolved within the produced bitumen phase. The optimum loading of hydrocarbons injected with steam will be chosen to maximize pressure drawdown and fluid removal of the reservoir using conventional CSS artificial lift equipment already in place.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- EXXONMOBIL UPSTREAM RESEARCH COMPANY
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Corry, Kathy E | Calgary, CA | 1 | 64 |
Leaute, Roland P | Calgary, CA | 3 | 455 |
Pustanyk, B Karl | Bragg Creek, CA | 2 | 69 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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