US 11,702,915 B2
Method and system for Co2 enhanced oil recovery
Michael Drescher, Trondheim (NO); Torbjørn Fiveland, Skien (NO); Olav Kristiansen, Trondheim (NO); Thomas Levy, Skien (NO); Knut Arild Maråk, Trondheim (NO); Bengt Olav Neeraas, Trondheim (NO); and Per Ivar Karstad, Jonsvatnet (NO)
Assigned to Equinor Energy AS, Stavanger (NO)
Filed by Equinor Energy AS, Stavanger (NO)
Filed on Oct. 4, 2021, as Appl. No. 17/492,929.
Application 17/492,929 is a continuation of application No. 16/484,339, granted, now 11,162,342, previously published as PCT/NO2018/050034, filed on Feb. 7, 2018.
Claims priority of application No. 1702004 (GB), filed on Feb. 7, 2017.
Prior Publication US 2022/0025747 A1, Jan. 27, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 43/16 (2006.01); E21B 43/40 (2006.01)
CPC E21B 43/164 (2013.01) [E21B 43/40 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of Enhanced Oil Recovery (EOR) from an oil reservoir by CO2 flooding, comprising:
producing a well stream from an oil reservoir;
separating the well stream into a liquid phase and a gas phase with a first gas/liquid separator, wherein the gas phase comprises both CO2 gas and hydrocarbon gas;
cooling the gas phase with a first cooler;
compressing the gas phase using a first compressor into a compressed stream;
mixing the compressed stream with an external source of CO2 in a mixer to form an injection stream;
cooling the injection stream with a second cooler arranged downstream of the mixer; and
injecting the injection stream into the reservoir.