Thermal energy production by in situ combustion of coal

Details Thermal energy production by in situ combustion of coal Thermal energy production by in situ combustion of coal

1976-02-23

1977-04-26

Novosad, Stephen J.

Wells

Processes

In situ combustion

166280, 166 50, 165 45, E21B 4324

Patent

active

040195775

ABSTRACT:
This specification discloses a method of recovering thermal energy from a coal formation having a preferred vertical fracture orientation. An injection well and a production well are provided to extend into the coal formation and a vertical fracture is formed by hydraulic fracturing techniques and propagated into the coal formation to communicate with both the wells. The vertical fracture is propped in the lower portion only. A combustion-supporting gas is injected into the propped portion of the fracture and the coal is ignited. Injection of the combustion-supporting gas is continued to propagate a combustion zone along the propped portion of the fracture and hot product gases generated at the combustion zone are produced to recover the heat or thermal energy of the coal. Water may also be injected into the fracture to transport the heat resulting from the combustion of the coal to the production well for recovery.

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patent: 3896877 (1975-07-01), Vogt, Jr. et al.
patent: 3933447 (1976-01-01), Pasini et al.

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