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Mining Publication: Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal

Original creation date: January 1985

Image of publication Comparison of Rotary and In-Hole Motor Techniques for Drilling Horizontal Boreholes in Coal

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.

Authors: SL Kravits, A Sainato, GL Finfinger

Report of Investigations - January 1985

  • 2.35 MB

NIOSHTIC2 Number: 10004416

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8933, 1985 Jan; :1-31

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