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Mining Publication: Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal
Keywords: Boreholes Rotary drills
Original creation date: January 1985
Authors: SL Kravits, A Sainato, GL Finfinger
Report of Investigations - January 1985
Download PDF Document (2.35 MB)
NIOSHTIC2 Number: 10004416
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8933, 1985 Jan; :1-31
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.
Image of publication Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in CoalReport of Investigations - January 1985
Download PDF Document (2.35 MB)
NIOSHTIC2 Number: 10004416
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8933, 1985 Jan; :1-31
See Also
Cableless Electronic Surveying Systems for Horizontal Holes
Coal Mine Methane: A Review of Capture and Utilization Practices with Benefits to Mining Safety and to Greenhouse Gas Reduction
Correlation of Sonic Travel Time to the Uniaxial Compressive Strength of U.S. Coal Measure Rocks
Demonstration of Remote Mine Seal Construction
Detecting Strata Fracturing and Roof Failures from a Borehole Based Microseismic System
Effects of Stimulation Treatments on Coalbeds and Surrounding Strata: Evidence from Underground Observations
Horizontal Trajectories of Rotary-Drilled Holes
Removing Methane (Degasification) from the Pocahontas No. 4 Coalbed in Southern West Virginia
Rotary Drilling Holes in Coalbeds for Degasification
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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