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Grouting Horizontal Drainage Holes in Coalbeds.
NTIS: PB 80-110315 :16 pages
This report describes a method developed by the Bureau of Mines for sealing horizontal degasification holes so that they do not create a gas explosion hazard when intercepted by mining. A cement slurry is pumped into the hole through an injection pipe that extends to the back of the hole. Pumping continues until the slurry returns through the annulus to the hole collar. The hole is then shut in and the grout allowed to harden. Application of the procedure to six horizontal degasification holes at Eastern Associated Coal Corp.'S Honey Run Shaft is discussed.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 80-110315
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division