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Comparison of rotary and in-hole motor techniques for drilling horizontal boreholes in coal
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Published Date:1985
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Series:
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Language:English
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[PDF-2.35 MB]
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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
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Published Date:Series:Description:File Type:[PDF - 138.71 KB]