Suction of gases from boreholes in coal mining

Details Suction of gases from boreholes in coal mining Suction of gases from boreholes in coal mining

1980-07-18

1982-03-30

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166295, 299 12, E21B 33124, E21B 33134, E21F 700

Patent

active

043219675

ABSTRACT:
Gas, particularly methane, is sucked from a borehole (B) extending from a coal mine working by means of a casing consisting of tubular plastics sections (8) by means of a vacuum pump connected to the lower end of the casing. The casing is sealed to the borehole by a sliding seal (2) which allows the casing to be moved up and down the borehole until the upper end of the casing is at the level of the maximum yield of gas. The annular space between the casing and borehole wall is then filled with a liquid which expands and sets to form a polyurethane foam (4).

REFERENCES:
patent: 4008576 (1977-02-01), Meyer et al.

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