EP 0325272 A2 19890726 - Drill bit with improved steerability.
Title (en)
Drill bit with improved steerability.
Title (de)
Bohrmeissel mit Führungsmöglichkeiten.
Title (fr)
Trépan avec possibilités de guidage.
Publication
Application
Priority
US 14629088 A 19880120
Abstract (en)
A drill bit offering improved steerability. Drill bits include gage sections which are adapted to facilitate deflection of the bits within a borehole to facilitate navigational or directional drilling. The gage portions of the bit may be arranged in an arcuate path around a portion of the periphery of the bit. Also, the bit portions may be spaced and adapted to serve, at least in part, as fulcrums, to facilitate deflection of the bit and the bringing of gage cutting portions of the bit in contact with the sidewalls of the borehole.
IPC 1-7
IPC 8 full level
E21B 7/06 (2006.01); E21B 10/46 (2006.01); E21B 17/10 (2006.01)
CPC (source: EP)
E21B 7/064 (2013.01); E21B 10/46 (2013.01); E21B 17/1092 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0325272 A2 19890726; EP 0325272 A3 19900207; EP 0325272 B1 19930428; AU 2858589 A 19890720; AU 613142 B2 19910725; CA 1306245 C 19920811; DE 68906166 D1 19930603; DE 68906166 T2 19931125
DOCDB simple family (application)
EP 89100960 A 19890120; AU 2858589 A 19890118; CA 588595 A 19890119; DE 68906166 T 19890120