ENHANCED STEAM EXTRACTION OF IN SITU BITUMEN Russian patent published in 2019 - IPC E21B43/24 C09K8/592 

FIELD: mining.

SUBSTANCE: invention relates to the extraction of bitumen from subterranean locations. Method of extracting bitumen from subterranean locations includes pumping a steam mixture to a subterranean location containing bitumen, the steam mixture containing alkylene glycol ether and steam, extracting at least part of the bitumen from the subterranean location to the surface, where the alkylene glycol ether is different from amino glycol ether and where the alkylene glycol ether has the following chemical formula: H(OR₁)_nOR₂, where R₁ is an alkylene residue, OR₁ is an alkylene glycol residue, R₂ is alkyl or aryl, OR₂ is an ether fragment of alkyl or ether fragment of aryl and n is an integer from one to less than ten, each alkylene residue has from more than two to less than eight carbons, and when n is greater than one, R₁ in each alkylene glycol residue may be the same or different.

EFFECT: lower concentration and higher thermal stability of the additives used, no soil contamination.

11 cl, 1 dwg, 3 tbl, 7 ex