INDIRECT DOWNHOLE STEAM GENERATOR WITH CARBON DIOXIDE CAPTURE

摘要

Methods and systems for enhancing recovery of hydrocarbons below a permafrost layer are provided which use a downhole combustion device to inject a heated fluid into a subten-anean formation to enhance hydrocarbon recovery through viscosity reduction. The system is configured to avoid adversely thermally affecting the permafrost, which is highly undesirable. One or more heat exchangers may be used in conjunction with the combustion device to enhance heat transfer of various streams. The heat exchanger(s) mitigate the adverse effects of various streams on the permafrost by lowering the return stream temperatures, which are transported through the wellbore. A carbon dioxide capture system may be provided to recover carbon dioxide from the combustion device exhaust. Certain optional embodiments allow the amount of carbon dioxide introduced into the formation to be independently controlled to furtherenhance the hydrocarbon recovery.