Method of processing coal channels in underground coal gasificat

Details Method of processing coal channels in underground coal gasificat Method of processing coal channels in underground coal gasificat

1975-11-10

1977-05-24

Purser, Ernest R.

Wells

Processes

With indicating, testing, measuring or locating

48DIG6, 166256, E21B 4324

Patent

active

040249140

ABSTRACT:
A method of processing recently bored channels when putting into operation an underground gas generator (underground gasifier), consisting, on the one hand, in forced air blowing and, on the other hand, in taking away hot gases, is characterized by determining the magnitude of the hydrostatic pressure by measuring the hydrostatic column of underground waters in a vertical direction from the point at which air is forced into the well to the level of the underground waters, and adjusting the outlet section of the gas discharging wells. This permits maintaining in the boring channel a pressure at a level which is not less than that produced by the hydrostatic column to preclude an inflow of underground waters to the channel being processed. The temperature in the channel is raised at a rate from about 80.degree. C to about 100.degree. C per hour up to at least 500.degree. C.

REFERENCES:
patent: 3628929 (1971-12-01), Glass et al.
Sellers, "Gasification of Coal Underground," The Gas World, Feb. 8, 1947, pp. 217-219.

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