EP 0289668 A1 19881109 - Roller drill bit with a cone-retaining means.
Title (en)
Roller drill bit with a cone-retaining means.
Title (de)
Rollenbohrmeissel mit Vorrichtung zum Festhalten des Kegels.
Title (fr)
Trépan de forage à molettes avec dispositif pour retenir le cÔne.
Publication
Application
Priority
EP 87303233 A 19870414
Abstract (en)
A drill bit is shown which is connectable to the lower end of a rotary drill string for use in drilling oil and gas wells as drilling mud is circulated downward through the string, out the bit, and upwardly within the annulus between the string and well bore so as to remove cuttings therefrom. The bit has cones (31) which are mounted for rotation about thrust bearings which extend inwardly from the lower ends of legs which depend from a shank at the upper end of the bit body which is attached to the drill string. The cones are secured on the bearing journals by a system of sealed liquid passages (50-51) and reservoirs which provide a liquid lock requiring no retaining bearings or washers.
IPC 1-7
IPC 8 full level
E21B 10/18 (2006.01); E21B 10/20 (2006.01); E21B 10/22 (2006.01); E21B 10/24 (2006.01)
CPC (source: EP)
E21B 10/18 (2013.01); E21B 10/20 (2013.01); E21B 10/22 (2013.01); E21B 10/246 (2013.01)
Citation (search report)
- [A] US 2174102 A 19390926 - CATLAND ALFRED C
- [A] US 3244459 A 19660405 - ORTLOFF JOHN E
- [A] FR 2438737 A1 19800509 - DRESSER IND [US]
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 87303233 A 19870414