Wells – Processes – Heating – cooling or insulating
Patent
1997-10-15
2000-05-02
Bagnell, David
Wells
Processes
Heating, cooling or insulating
166303, 166 57, 1662721, 299 14, E21B 3602
Patent
active
060560576
ABSTRACT:
A method and apparatus is disclosed for heating of formations using fired heaters. Each fired heater may consist of two concentric tubulars emplaced in the formation, connected via a wellhead to a burner at the surface. Combustion gases from the burner go down to the bottom of the inner tubular and return to the surface in the annular space between the two tubulars. The two tubulars may be insulated in an overburden zone where heating is not desired. A plurality of fired heaters can be connected together such that the combustion gases from a first fired heater well are piped through insulated interconnect piping to become the air inlet for a second fired heater well, which also has a burner at its wellhead. This can be repeated for other heater wells, until the oxygen content of the combustion gas is reduced near zero. The combustion gas from the last fired heater well may be routed through a heat exchanger in which the fresh inlet air for the first heater well is preheated. A substantially uniform temperature is maintained in each heater well by using a high mass flow into the heater well.
REFERENCES:
patent: 1342741 (1920-06-01), Day
patent: 2902270 (1959-09-01), Salomonsson et al.
patent: 3095031 (1963-06-01), Eurenius et al.
patent: 3181613 (1965-05-01), Krueger
patent: 5392854 (1995-02-01), Vinegar et al.
Karanikas John Michael
Mikus Thomas
Vinegar Harold J.
Wellington Scott Lee
Bagnell David
Kang Chi H.
Shell Oil Company
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