Abstract

Rock drilling method and apparatus utilizing high pressure water jets for drilling holes of relatively small diameter at speeds significantly greater than that attainable with existing drilling tools. Greatly increased drilling rates are attained due to jet nozzle geometry and speed of rotation. The jet nozzle design has two orifices, one pointing axially ahead in the direction of travel and the second inclined at an angle of approximately 30° from the axis. The two orifices have diameters in the ratio of approximately 1:2. Liquid jet velocities in excess of 1,000 ft/sec are used, and the nozzle is rotated at speeds up to 1,000 rpm and higher.

Department(s)

Mining and Nuclear Engineering

Patent Application Number

US05/763,926

Patent Number

US4119160A

Document Type

Patent

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 1978 The Curators of the University of Missouri, All rights reserved.

Publication Date

01 Jan 1978

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