In situ coal gasification operations

Details In situ coal gasification operations In situ coal gasification operations

E - Fixed Constructions

21

B

166/36

E21B 43/247 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1157370

INVENTORS: RICHARD MICHAEL BOYD DENNIS D. FISCHER ALAN E. HUMPHREY SAMUEL BRUCE KING DAVID L. WHITMAN TITLE: IN SITU COAL GASIFICATION OPERATIONS ABSTRACT OF THE DISCLOSURE An in situ coal gasification process adapted for large scale commercial projects is provided. Techniques are provided to insure establishment of a gasification front over the full seam thickness as each successive injection well in the array is brought on line. This is accomplished by controlling the oxidant introduction in a prescribed manner during the early stages of injection after pneumatic communication between well pairs has been established. Also provided are techniques and standards for avoiding or controlling subsidence and for conducting gasification operations in free water laden seams and in coal seams subject to spontaneous combustion.

378040

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