Wells – Processes – Distinct – separate injection and producing wells
Patent
1978-12-06
1980-09-02
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166259, 166 50, 166 52, 299 4, 299 5, E21C 4300
Patent
active
042202035
ABSTRACT:
For the purpose of in-situ recovery of coal a borehole is driven from the surface in the plane of the coal over at least a large part of its travel, as far as conditions permit. At or near its end this borehole is widened over such a length and to such a width as corresponds with at least twice the deviation to be expected in the horizontal projection of a second borehole which is driven so far as to connect the widened section described above. The widened section is preferably made with the aid of mechanical means.
After the boreholes have been linked, the coal is recovered by gasification, dissolution or extraction, whether or not under supercritical conditions and whether or not with attendant chemical/physical disintegration. The method according to the invention is particularly suited for use in the `in-line` gasification technique.
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Novosad Stephen J.
Stamicarbon B.V.
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