| US 7,467,658 B2 | ||
| Down hole drilling fluid heating apparatus and method | ||
| Gerald Edward Kent, Spruce Grove (Canada); and David Leonwill Jones, Duncan, Okla. (US) | ||
| Assigned to Halliburton Energy Services, Inc., Houston, Tex. (US) | ||
| Filed on Dec. 08, 2004, as Appl. No. 11/6,641. | ||
| Claims priority of application No. 2457329 (CA), filed on Feb. 10, 2004. | ||
| Prior Publication US 2005/0173119 A1, Aug. 11, 2005 | ||
| Int. Cl. E21B 36/00 (2006.01); E21B 34/00 (2006.01) | ||
| U.S. Cl. 166—57 [166/302; 166/319; 166/373] | 50 Claims |
| 1. An apparatus for providing heat energy to a fluid, the apparatus comprising:
(a) a housing adapted for connecting into a working string and for inserting into a borehole;
(b) a flow path for the fluid extending within the housing;
(c) a pressure drop device positioned within the flow path;
(d) an actuator for actuating the apparatus between a minimum pressure drop position and a maximum pressure drop position;
and
(e) a recirculation mechanism for recirculating at least a portion of the fluid back through the apparatus.
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