EP 0033654 A2 19810812 - Rotary drill bits and method of use.
Title (en)
Rotary drill bits and method of use.
Title (de)
Drehbohrmeissel und Anwendungsverfahren.
Title (fr)
Trépan de forage rotary et procédé pour son utilisation.
Publication
Application
Priority
- GB 8003591 A 19800202
- GB 8004427 A 19800209
Abstract (en)
To prevent foreign bodies or lost circulation material in drill mud locking the nozzles of a rotary drill bit, the central passageway incorporates a separating means arranged to separate larger particles from the drill mud and to divert them away from the nozzles and out of the bit. The separating means is arranged to operate in a static or dynamic manner.
IPC 1-7
IPC 8 full level
E21B 7/18 (2006.01); E21B 10/60 (2006.01); E21B 21/00 (2006.01)
CPC (source: EP)
E21B 7/18 (2013.01); E21B 10/60 (2013.01); E21B 21/002 (2013.01); E21B 21/003 (2013.01)
Designated contracting state (EPC)
BE CH DE FR GB LI NL SE
DOCDB simple family (publication)
EP 0033654 A2 19810812; EP 0033654 A3 19811021; AU 6681481 A 19810813; BR 8100589 A 19810818; NO 810302 L 19810803
DOCDB simple family (application)
EP 81300424 A 19810202; AU 6681481 A 19810202; BR 8100589 A 19810202; NO 810302 A 19810129