Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1981-10-05
1983-04-12
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
308 4A, E21B 1710, E21C 900
Patent
active
043794947
ABSTRACT:
Drill string stabilizing sleeves (20, 24) are provided for use on a drill string (10) to guide the drill string during drilling. The stabilizer sleeves are replacable and may be manufactured at relatively low cost. Each sleeve includes a cylindrical body (28) having a number of well bore contacting surfaces (34) formed on the outer surface thereof. The surfaces are separated by grooves (38) to permit flow past the stabilizer sleeve. Slots (40, 42) are formed through the cylindrical body on diametrically opposed sides. The slots pass through the well bore contacting surfaces to the inner surface of the body. Flats (44, 46) are provided in opposed sides of the drill string section where the stabilizing is to be performed. Cylindrical segments (54, 56) are positioned within the flats and continue the arc of curvature of the drill string section. Each of the cylindrical segments, in turn, includes a flat (66, 68) for accepting locking blocks (78, 80) inserted through the slots in the cylindrical body (28). The locking blocks secure the cylindrical body in a predetermined position relative to the drill string section and transmits force acting therebetween. Threaded screws (84) may be used to secure the locking blocks to the cylindrical segments. However, these screws are not required to withstand the entire force between the body and drill string section due to the engagement of the locking blades and cylindrical segments.
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patent: 3993368 (1976-11-01), Jurgens et al.
Falk Joseph
International Petroleum Engineering Corporation
Mills Jerry W.
Novosad Stephen J.
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