Drag blade bit with diamond cutting elements
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United States of America Patent
Stats
-
Feb 19, 1985
Grant Date -
N/A
app pub date -
Apr 29, 1983
filing date -
Apr 29, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drag blade bit for connection on a drill string has a hollow body on which there are welded a plurality of cutting or drilling blades. The blades extend longitudinally and radially of the bit body and terminate in relatively flat, radially extending cutting edges. A plurality of cutters are positioned in and spaced along the cutting edges and consists of cylindrical sintered carbide inserts with polycrystalline diamond cutting elements mounted thereon. Hardfacing is provided on the cutting edges between the cutters and on the other surfaces of the blades and the bit body subject to abrasive wear. One or more nozzles are positioned in passages from the interior of the bit body for directing flow of drilling fluid for flushing cuttings from the well bore and for cooling the bit.
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