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公开(公告)号：US20190017361A1
公开(公告)日：2019-01-17
申请号：US15968087
申请日：2018-05-01
Applicant: CONOCOPHILLIPS COMPANY
Inventor： Bo CHEN , Thomas James WHEELER , Pradeep Ananth GOVIND
Abstract: A variation of expanding solvent steam assisted gravity drainage (ES-SAGD) production of heavy oil wherein steam and hydrocarbon solvent are co-injected into a heavy oil reservoir and water, hydrocarbon solvent and heavy oil are produced by gravity drainage until the steam chamber is well developed or until oil recovery reaches about 20-30% of oil in place. At that time, the wells are switched to a lateral sweep using non-condensible gas (NSG) and steam co-injection, where more hydrocarbon solvent is recovered than is recovered with ES-SAGD used alone and where the cumulative steam to oil ratio is reduced over using -ES-SAGD alone.
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