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Methane drainage: experience with hydraulic stimulation through slotted casing.

Authors
Lambert-SW; Trevits-MA
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8295, 1978 Jan; :1-16
NIOSHTIC No.
10000676
Abstract
The Bureau of Mines examined the wellbore of a vertical gas drainage well in the Mary Lee coalbed to determine the results of specific completion procedures in coal. A jet-slotting tool was used to cut four vertical slots through the casing about 1 ft below the coalbed. Even though stimulation treatment pressure was excessive, hydraulically induced channels were contained entirely within the target coal zone. Sand-filled, induced channels were horizontal, inclined, and vertical, and were propagated in directions similar to bedding planes, rock joint, and coal cleat directions measured in the mine. Variable gas flow rates, recorded during the productive life of the well, were attributed to chronic downhole pump malfunction and the slotted casing below the production zone.
Keywords
Mine-gases; Mining-industry; Methanes; Methane-drainage; Methane-control; Explosive-gases; Explosive-atmospheres; Underground-mining; Coal-mining; Control-technology; Engineering-controls
CAS No.
74-82-8
Publication Date
19780101
Document Type
IH; Report of Investigations
Fiscal Year
1978
NTIS Accession No.
PB-290114
NTIS Price
A03
Identifying No.
RI-8295
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8295
State
PA
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