| 摘要 |
<p>A method is provided for injecting solvent into a bitumen reserve at a well. The well is located adjacent at least one steam assisted gravity drainage (SAGD) well pair in the bitumen reserve, and includes an infill well or a step-out well. The method includes injecting a first solvent into the bitumen reserve at the well, wherein a region of the bitumen reserve near the well is at a first temperature. The method also includes, at a later time when the region of the bitumen reserve is at a second temperature higher than the first temperature, injecting a second solvent into the bitumen reserve at the well, wherein the second solvent has a higher boiling point than the first solvent and the first and second solvents are operable to reduce the viscosity of the bitumen in the reserve.</p> |
