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
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|---|---|---|---|
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| METHOD OF INCREASING LUBRICATING CAPACITY OF WELL FLUIDS | 2015 |
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RU2721983C2 |
| OIL FORMATION TREATMENT EMULSION | 2004 |
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| TREATMENT METHOD OF BOTTOM-HOLE OIL FORMATION ZONE | 2012 |
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| DEMULSIFYING COMPOSITION AND A METHOD OF ITS USE | 2017 |
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