METHOD FOR INCREASING MOBILITY OF HEAVY CRUDE OIL IN SUBTERRANEAN FORMATIONS Russian patent published in 2019 - IPC E21B43/22 C09K8/584 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: group of inventions relates to extraction of crude oil. Method for improving mobility of heavy crude oil in a porous subterranean formation includes introducing into a formation a liquid composition containing water, a surfactant and a co-solvent, and formation in formation of at least one of emulsion and dispersion, wherein emulsion or dispersion has water as outer phase and heavy crude oil as inner phase. Surfactant is a nonionic compound and contains 20–30 % methanol or 5–10 % 2-butoxyethanol. Surfactant in combination with the combined solvent has a hydrophilic-lipophilic balance of more than 10. Combined solvent contains glycol ether. In addition, the liquid composition contains an emulsifier, an anti-turbulent additive containing an ethoxylated surfactant, and a linker. Linker is a glycol, polyol, phenol or alcohol containing more than eight carbon atoms, or their combinations.

EFFECT: technical result is improved mobility of heavy crude oil in subterranean formation.

26 cl, 4 tbl