Converting underground coal fires into commercial products

Details Converting underground coal fires into commercial products Converting underground coal fires into commercial products

1977-04-18

1978-05-30

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

166261, E21C 4300

Patent

active

040920526

ABSTRACT:
An underground coal fire is smothered by sealing the overburden for a minimum depth over the coal deposit. Wells are drilled into the fire area and the underground reaction zone is pressurized. Using various combinations of injecting oxidizers and reducing agents the coal deposit is produced in situ to yield a variety of useful products. Wells are cased without cement and with the hermetic seal attained by a column of slurry between the casing and well bore.

REFERENCES:
patent: 2497868 (1950-02-01), Dalin
patent: 2593477 (1952-04-01), Newman et al.
patent: 2896931 (1959-07-01), Marquis
patent: 3421587 (1969-01-01), Heavilon et al.
patent: 3865186 (1975-02-01), Von Hippel
patent: 3924680 (1975-12-01), Terry
patent: 3927719 (1975-12-01), Maser

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