Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1988-09-09
1989-11-28
Dang, Hoang C.
Boring or penetrating the earth
Processes
Boring with specific fluid
175329, 175393, E21B 718, E21B 1060
Patent
active
048831328
ABSTRACT:
An improved bit and method for cutting plastic and sticky rock formations, which tend to cause bit balling, is provided by a drag bit having a cutting face formed of a plurality of generally radially extending open arched blades. Each arched blade is provided with a cutting face and defines a cavity beneath the arched to the bit body. In a preferred embodiment, the cutting elements on the arched blade are a plurality of synthetic polycrystalline diamonds which are cut, sized and shaped to comformally fit with each other so as to present a substantially diamond-only surface as a cutting surface of the bit. Hydraulic nozzles are defined in the bit body beneath and azimuthally behind the arches formed by each blade. The nozzles direct hydraulic flow across the cavity under the arch and across each portion of the cutting face on the arch. As a result, when cutting, substantially only a diamond surface is provided for shearing the rock formation or contacting with velocity any portion of the plastic rock formation. Once the rock chip is exuded upwardly across the diamond face of the cutter, it is subjected to a directed hydraulic flow which peels the chip from the diamond face and transports it into the open cavity defined underneath the arched blade. The cavities under the arched blade form an open toroidal space around the bit and freely communicate with a plurality of large open waterways and junk slots. Large plastic fragments may then be cut, peeled from the face of the diamond cutters, and flushed through the waterways up the junk slots.
REFERENCES:
patent: 1945160 (1934-01-01), Pearce
patent: 2357835 (1944-09-01), Leissler
patent: 3059708 (1962-10-01), Cannon et al.
patent: 4341273 (1982-07-01), Walker et al.
patent: 4352400 (1982-10-01), Grappendorfer et al.
patent: 4440247 (1984-04-01), Sartor
"Stratapax Drill Blanks", by General Electric, Oct. 1982.
Dang Hoang C.
Eastman Christensen
Lynch Michael L.
Walkowski Joseph A.
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