| 摘要 |
A method for producing hydrocarbons from a subterranean formation comprises injecting a heated injection fluid composition into the formation. The heated injection fluid composition comprises at least steam and/or hot water ("W") and a solvent ("S") into the formation. Suitable solvents include C1 to C30 hydrocarbons, carbon dioxide, carbon monoxide and combinations thereof. The heated injection fluid composition has a first W to S volume ratio, (W:S)1, greater than or equal to about 5:1. The W to S volume ratio is subsequently reduced, at least once, to a different W to S volume ratio, (W:S)n, wherein at least one (W:S)n is less than (W:S)1 and each (W:S)n is greater than or equal to about 1.5:1 and n is in the range of from about 2 to about 12,000.
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