| 摘要 |
<p>A subterranean hydrocarbon reservoir is heated by providing a plurality of heating wellbores through the reservoir. Each heating wellbore includes an outer casing which is sealed with respect to the reservoir and a tubing string in the outer casing to permit a heated fluid to be circulated in a closed loop through the tubing string and the annulus between the tubing string and the outer casing. A separate production wellbore below the heating wellbores permits extraction of the heated hydrocarbons from the reservoir. A replacement fluid may be injected into the reservoir through a separate injection wellbore to drive the hydrocarbons to the production wellbore. Initially all wellbores in the reservoir may be configured as heating wellbores, but subsequent to initial heating, lowermost heating wellbores may be converted to production wellbores and uppermost heating wellbores may be converted to injection wellbores while intermediate wellbores remains as heating wellbores.</p> |
