Process for the recovery of oil from a natural oil reservoir

Wells – Processes – Distinct – separate injection and producing wells

Reexamination Certificate

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C166S401000

Reexamination Certificate

active

07077202

ABSTRACT:
A method for recovering oil (24) from a natural oil reservoir (18) includes the steps of separating air to produce an oxygen rich stream (40) and a nitrogen rich stream (34), providing a natural gas stream (12) and feeding at least part of the oxygen rich stream (40) and the natural gas stream (12) into a gas to liquid or GTL conversion installation (42) to produce hydrocarbon products (44) and heat. The heat produced in the gas to liquid conversion installation is used to produce energy (20) to pressurize (16) the nitrogen in the nitrogen rich stream (34) to produce a pressurized nitrogen rich stream (22). The pressurized nitrogen rich stream (22) is passed into a natural oil reservoir (18) to enhance the recovery of oil (24) from the reservoir.

REFERENCES:
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patent: 4434613 (1984-03-01), Stahl
patent: 5133406 (1992-07-01), Puri
patent: 5388645 (1995-02-01), Puri et al.
patent: 5566755 (1996-10-01), Seidle et al.
patent: 6494262 (2002-12-01), Chitty
patent: 2004/0256116 (2004-12-01), Olsvik et al.
patent: 0 162 368 (1985-11-01), None
patent: 2 117 053 (1983-10-01), None

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