Process for recovering methane gas from subterranean coalseams
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United States of America Patent
Stats
-
Mar 24, 1987
Grant Date -
N/A
app pub date -
Apr 1, 1986
filing date -
Apr 1, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process provides for the recovering of methane gas from subterranean coalseams having sloughing, or caving, characteristics. A borehole is drilled in a generally horizontal direction into a subterranean coalseam and as the drilling progresses, a flushable borehole cake is formed on and in the walls of the horizontal borehole. The borehole cake prevents contemporaneously sloughing, or caving, of the boreholes during the drilling operation. A perforated liner may be inserted into the horizontal borehole and the borehole cake is then flushed out in order to allow methane gas present in the coalseam to enter the liner from which it is collected.
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