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Circulated heated transfer fluid systems used to treat a subsurface formation

  • US 8,267,185 B2
  • Filed: 10/09/2009
  • Issued: 09/18/2012
  • Est. Priority Date: 10/13/2008
  • Status: Expired due to Fees
First Claim
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1. A method for heating a subsurface formation, comprising:

  • applying heat from a plurality of heaters to at least a portion of the subsurface formation by circulating a heat transfer fluid through at least one conduit in each of the heaters; and

    allowing a portion of at least one of the conduits of at least one of the heaters to move relative to the heater'"'"'s respective wellhead using one or more sliding seals in the wellhead to accommodate thermal expansion of the conduit.

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