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PERMFILE120951
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PERMFILE120951
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Last modified
8/24/2016 10:19:29 PM
Creation date
11/25/2007 8:57:05 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981013A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
SECTION 2.04 Site Description and Land Use Information
Media Type
D
Archive
Yes
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As previously indicated, the first exploration hole (GE <br />26-88) tapped methane and water at the seam horizon and 90 feet <br />below, so plans were initiated to convert it to a de-gassing and <br />de-watering hole to monitor flows and alleviate the mine <br />problems. Although the water inflow was not encountered until <br />the Maxwell, Apache and Allen seams were contacted, the water <br />level rose by artesian pressure to a steady level of 230 feet <br />above the Maxwell seam. <br />Unfortunately, because of strata pressure, GE-26-88 could <br />not be recovered after the delay in acquiring the necessary <br />casing, well-head fittings, pump, generator, etc. Therefore, a <br />companion hole (GE 33-88) was drilled and completed 20 feet <br />closer to the workings, which produced 440 mcf per day of methane <br />at absolute pressure (1,004 Btu per cubic foot) and 20 gpm of <br />water. An additional hole (GE 35-88), 80 feet away, encountered <br />similar conditions and produced 700 mcf per day of methane and <br />70 gpm of water. • <br />An analysis of the water (Table 5a), observations in the <br />mine of water and methane flowing upwards out of the seam floor, <br />the variation in methane liberation with change of water level <br />in the gas wells, and nature of the occurrence of water <br />encountered in other holes indicates that an open-fracture fault <br />system, charged with deep seated artesian water has been <br />encountered. The water pressure has hydro-fractured the coal, <br />allowing significant methane liberation from affected coal <br />seams. As the hydro-static pressure is reduced by water draining <br />into the mine and/or being pumped from bore holes, it is expected <br />that methane liberation could increase and then later <br />progressively decrease. <br />In fact, this is being experienced in the mine where, <br />despite the release of 1,140 mcf per day by the bore holes, the <br />methane liberation into the section had increased from 1.8 • <br />million cubic feet per day at the end of February to over 2 _ <br />million cf per day by the end of April. This increased methane <br />flow again caused temporary withdrawal in the section. <br />2.04-6(1) (Revised 09/01/89) <br />
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