Details:

Personal Author:
Kravits, S. J. (Stephen J.) ; Sainato, Albert. ; Finfinger, Gerald L. ;
Kravits, S. J. (Stephen J.) ; Sainato, Albert. ; Finfinger, Gerald L. ; Less -
Corporate Authors:
United States. Bureau of Mines. ;
Description:
"This Bureau of Mines report describes and compares the procedures, capital investments, and operating costs of rotary and in-hole motor drilling techniques used to drain methane gas from the Pittsburgh coalbed in an underground mine located in southwestern Pennsylvania. A timestudy was conducted during the drilling of each of two boreholes, and the data were collected to serve as a base for comparing drilling procedures and operating costs. Findings indicate that drilling with an in-hole motor offers four advantages over rotary drilling; namely, an increase in drilling productivity, fewer worker-hours required, ease of maintaining vertical and horizontal bit trajectory, and less expensive drilling cost per foot of borehole." - NIOSTHTIC-2 NIOSHTIC no. 10004416
Subject:
[+]
Boring.
Coalbed Methane Drainage.
Mine Ventilation.

Series:
Report of investigations (United States. Bureau of Mines) ; 8933;
Document Type:
Report ;
Place as Subject:
Pennsylvania ;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:bba1236469b685cf2e31395bd747336e4cc7683fd01a6db3c37513be32ffcaca
File Type:

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