Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1982-03-29
1984-08-28
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
308 4A, E21B 1710, E21C 900
Patent
active
044678797
ABSTRACT:
Well bore tools configured as centralizers/stabilizers, well bore reamers, and keyseat wipers each of which includes an elongate tubular body having a generally cylindrical outer surface and a diameter approximately equal to the diameter of the borehole being drilled. Each tool affords an improved mode of drilling a borehole by increasing downhole directional control and stability, increasing tool wear reliability, and reducing return mud flow resistance. The outer surface of each tool has a plurality of longitudinal passages formed in pairs of upright intersecting right and left hand helicies or spirals about the exterior of said tool and extending from one end to the other end thereof. The intersecting right and left hand helical or spiral channels form raised pad areas therebetween to provide 360.degree. contiguous well bore contact by each tool for enhanced stability and efficiency. In addition, the intersecting right and left hand helical channels afford greater surficial engagement area while providing unobstructed return mud flow paths between each tool and the wall of the borehole. The raised pad areas may have wear resistant surfaces which are arranged in a configuration for affording constant 360.degree. contiguous contact with the wall of the borehole. Preferably, the wear resistance surfaces are provided by replaceable inserts mounted in recesses in the pad areas.
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Cantrell Thomas L.
Dang Hoang C.
Hawn, Jr. Richard D.
Moore Stanley R.
Purser Ernest R.
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