Design of a Water Jet Drill for Development of Geothermal Resources. Annual Progress Report, June 1, 1976--May 31, 1977

Research was expanded to the drilling of crystalline rock. Advance rates of 40 inches per minute have been achieved at 16,000 psi, 10 gpm flow rate in a 30,000 psi compressive strength rock using the water alone as the drilling mechanism. The quality of the hole achieved as the jet drilled a variety of rock was found to vary and a hydromechanical drilling bit, combining high pressure water jets with roller cones, has been developed. A field drilling unit has been tested and modified to allow the drilling of holes to 3/sup 1///sub 2/ inch diameter using the hydromechanical drill. Preliminary work on the development of a cavitation test for rock is also included.

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Citation Date 1977-05-31T00:00:00

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Original ID B5519F20E9554F3DA3E178F65F8AE22E
Index Date 2016-03-17T21:26:21
Original Format ISO-USGIN
Original Version 1.2


Name Rock Mechanics & Explosives Research Center , University of Missouri- Rolla
Organization Rock Mechanics and Explosives Research Center, University of Missouri-Rolla, Rolla (USA)