| 摘要 |
In a rising steam flood thermal recovery process wherein viscous crude oil is recovered from a subsurface earth formation which comprises an upper predominately oil saturated zone and a lower predominately water saturated zone by injecting hot water and/or steam into the lower predominately water saturated zone through an injection well and producing fluids from the formation through a production well, a method for controlling the movement of steam within the formation by selectively plugging back the injection and producing wells.
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