Method of connection of wells by in-situ combustion

Details Method of connection of wells by in-situ combustion Method of connection of wells by in-situ combustion

1975-08-12

1977-07-19

Purser, Ernest R.

Wells

Processes

With indicating, testing, measuring or locating

166256, 175 12, E21C 4300

Patent

active

040362981

ABSTRACT:
A method of mine-less connection of wells for underground gasification by the filtrational fire connecting technique is intended primarily for forming a single unitary gasification channel for underground gasification of coal, oil shale and oil-bearing beds. In the disclosed method of connecting wells or boreholes drilled for underground gasification, the coal bed is ignited in one of the wells situated in the direction of formation of the unitary gasification channel. After a center of combustion has been set in this well, an air blast is directed at a permanent flow rate into the well with which the connection is to be effected. The pressure of the air blast charged into the well is measured, and when the pressure drops considerably, an air blast is charged for connection purposes into the next successive well in the direction of formation of the gasification channel. The disclosed method provides for maintaining the combustion source in the area of the well connected with the gasification channel and thus for ensuring reliable formation of the unitary single gasification channel.

REFERENCES:
patent: 2841375 (1958-07-01), Salomonsson
patent: 2923535 (1960-02-01), Ljungstrom
patent: 3032103 (1962-05-01), Parker
patent: 3298434 (1967-01-01), Graham
patent: 3563606 (1971-02-01), Sears
Wilkins, "The Underground Gasification of Coal", The Gas World, 11/25/44, pp. 545-550.
Thring, "Underground Gasification of Coal", Mining Congress Journal, 9/44, pp. 37, 38 & 52.
Jolley et al., "The Underground Gasification of Coal", Fuel in Science and Practice, vol. XXIV, No. 2, pp. 31-36.

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