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- W1563485149 abstract "This book reports on the U.S. Bureau of Mines that has demonstrated in laboratory tests that drilling with surface-charge-neutralizing concentrations of polyethylene oxide (PEO) polymer solutions simultaneously improves penetration rates and extends bit life. The applicability of this additive to improve drilling performance in coal measure rocks was demonstrated under field conditions at an abandoned mine land site in Pennsylvania and a producing coal mine property in Ohio. Penetration rate improvements ranging from 15 to 50 pct. were obtained when core drilling through a variety of coal measure lithologies. Drilling cost analysis indicates that the small added cost of using the polymer is more than offset by the savings that result from demonstrated increased drilling penetration rates." @default.
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- W1563485149 date "1991-01-01" @default.
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- W1563485149 title "Improved drilling of coal measure rocks for underground mine void detection and exploration programs" @default.
- W1563485149 hasPublicationYear "1991" @default.
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