Cavitating liquid jet assisted drill bit and method for deep-hol

Boring or penetrating the earth – Processes – Boring with specific fluid

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175339, 175393, 175422, 239101, E21B 718

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active

042627575

ABSTRACT:
A drill bit and a method for deep-hole drilling in which the drill bit has mechanical cutting means located on its lower cutting face for cutting a solid surface upon rotation of the bit and a plurality of cavitating liquid jet nozzles spaced around the face of the bit to assist in the drilling action, the nozzles being located so as to discharge a plurality of downwardly directed and concentric liquid jets that cavitate to fracture the surface to be drilled in a series of non-overlapping slots as the bit is rotated.

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patent: 3545552 (1970-12-01), Angona
patent: 3603410 (1971-09-01), Angona
patent: 3713699 (1973-01-01), Johnson, Jr.
patent: 3838742 (1974-10-01), Juvkam-Wold
patent: 4071097 (1978-01-01), Fulop et al.

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