Method of heat exchange for variable-content nitrogen rejection

Details Method of heat exchange for variable-content nitrogen rejection Method of heat exchange for variable-content nitrogen rejection

1986-09-04

1988-01-26

Cline, William R.

Wells

Processes

Producing the well

166267, 165 1, 165166, 165101, 62 11, 62 36, 62 31, F25J 302, E21B 4324, E21B 4300

Patent

active

047211644

ABSTRACT:
The present invention relates to an improvement to a nitrogen or carbon dioxide rejection process used in an enhanced oil recovery project. In rejection processes for enhanced oil recovery projects at least a portion of a feed stream from the reservoir is precooled in a heat exchanger before distillation to separate the feed stream into a nitrogen or carbon dioxide fraction and a methane fraction. The improvement to this rejection process is the precooling of the feed stream by heat exchange with the nitrogen or carbon dioxide fraction and the methane fractions in a plate-fin heat exchanger with at least three circuits. In the heat exchanger, a first circuit is utilized as a nitrogen or carbon dioxide circuit to conduct all of the nitrogen or carbon dioxide coolant during the first part of the project life, and a minor portion of the total nitrogen or carbon dioxide coolant during the second and last part of the project life; a second circuit is utilized as a methane circuit to conduct a minor portion of the methane coolant during the first part of the project life, and all of the methane coolant during the second and last part of the project life, a third circuit is utilized as a common circuit to conduct the remaining major portion of the methane coolant during the first part of the project life, and the remaining major portion of the nitrogen or carbon dioxide coolant during the second and last part of the project life. Switching from methane coolant to nitrogen or carbon dioxide coolant in the third circuit is done when the nitrogen or carbon dioxide coolant flow exceeds the methane coolant flow.

REFERENCES:
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patent: 4050506 (1977-09-01), Small
patent: 4451275 (1984-05-01), Vines et al.
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patent: 4504295 (1985-03-01), Davis et al.
patent: 4592767 (1986-06-01), Pahade et al.
patent: 4622053 (1986-11-01), Tomilson et al.

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