Method and apparatus for water jet drilling of rock

Patent · 01 January 1978

OSTI ID:863206

Summers, David A ^[1]; Mazurkiewicz, Marian ^[2]; Bushnell, Dwight J ^[3]; Blaine, James ^[1]

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1. Rolla, MO
2. Wroclaw, PL
3. Corvallis, OR

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.degree. 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.

• Assignee: Curators of University of Missouri (Columbia, MO)
• Patent Number(s): US 4119160
• OSTI ID: 863206
• Country of Publication: United States
• Language: English

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