Details:

Personal Author:
Oyler, David C.
Corporate Authors:
United States. Bureau of Mines.
Description:
"The U.S. Bureau of Mines and the United States steel corporation evaluated the progress of methane drainage at the Oak Grove, Alabama, degasification pattern. Coalbed pressures were monitored between December 1981 and November 1985. Formation pressures, in the lower bench of the Mary Lee coalbed, were reduced from 400 lbf/in2(ga) in 1977 to 50 lbf/in2(ga) in November 1985. Gas contents of coal cores obtained from monitor wells were compared with coalbed gas contents measured in 1976. Data indicated a 48- to 56-pct reduction within the pattern and a 29-pct reduction at a point 500 ft outside the pattern. The effect of the advance of a section of the Oak Grove Mine on changes in gas and water production rates in the pattern was evaluated. Gas production increases were noted in 12 wells; water production decreases were noted in 6. The times of initial influence indicate the presence of a zone of high permeability within the pattern. This zone correlates well in orientation and location with a fracture zone mined through at the mine. The existence of such fracture zones could have a significant effect on productivity of individual coalbed methane wells." - NIOSHTIC-2

NIOSH no. 10007352


Subject:
[+]
Coalbed Methane -- Measurement.
Coalbed Methane Drainage -- Evaluation.

Series:
Report of investigations (United States. Bureau of Mines) ; 9282
Document Type:
Report
Place as Subject:
Alabama ; Alabama -- Oak Grove Region
Alabama ; Alabama -- Oak Grove Region Less -
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:ace4e1e9ad491654af658a45344005b7875e8802b6b976519a890f5e2e030207
File Type:

Supporting Files

• No Additional Files

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