LNG with ethane enrichment and reinjection gas as refrigerant

Details LNG with ethane enrichment and reinjection gas as refrigerant LNG with ethane enrichment and reinjection gas as refrigerant

1999-04-26

2000-10-03

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62 482, 62631, F25J 300

Patent

active

061256536

ABSTRACT:
The present invention comprises a process for producing liquefied natural gas from the methane that is produced during natural gas liquids extraction. The process includes distilling the feed to extract methane, then cooling and expanding the methane to produce liquefied natural gas and cold methane vapor. The cold methane vapor is employed as a coolant to precool the feed and to cool the methane before expansion, and is then recompressed for reinjection into the well formation. The bottoms from the methane distillation may be further distilled to extract ethane, which may be cooled with the cold methane vapor and combined with the liquefied natural gas product. A portion of the recompressed methane may be diverted from the compressor train, cooled and expanded to produce additional liquefied natural gas and cold methane vapor.

REFERENCES:
patent: 3213631 (1965-10-01), Kniel
patent: 3520143 (1970-07-01), Becker
patent: 4411676 (1983-10-01), Tedder
Report entitled "Putting a New Emphasis on LNG," from Phillips LNG Ventures, Rev. Feb. 1998.
Article entitled "Gas Liquids Recovery Technology" by Ortloff Engineers, Ltd., Midland, Tx.
Article entitled "Major Advantages to Siting LNG Plant Offshore," by Chris Dubar, et al., Offshore, Aug. 1998.
Report entitled "Capabilities and Experience Gas Processing and LNG," by Black & Veatch Pritchard, pp. 1-82.
Article entitled "A Competitive Offshore LNG Scheme Utilizing a Gravity Base Structure and Improved Nitrogen Cycle Process," by Chris Dubar, et al., BHP Petroleum, pp. 1-21.
Report entitled "LNG Capabilities," including background materials, of Air Products and Cemicals, Inc., 1998.
Report entitled "Presentation of LNG Technology," by Linde for Texaco, Jun. 10, 1998.

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