Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1977-01-31
1978-10-10
Purser, Ernest R.
Boring or penetrating the earth
Processes
Boring with specific fluid
175422, 239548, E21B 718
Patent
active
041191609
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.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.
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Novel Drilling Techniques, William C. Maurer, Pergamon Press, NY., Mar. 1968, pp. 39-44.
Blaine James
Bushnell Dwight J.
Mazurkiewicz Marian
Summers David A.
Favreau Richard E.
Purser Ernest R.
Snyder Ray E.
The Curators of the University of Missouri
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