EP 0033654 A3 19811021 - ROTARY DRILL BITS AND METHOD OF USE

Title (en)

ROTARY DRILL BITS AND METHOD OF USE

Publication

EP 0033654 A3 19811021 (EN)

Application

EP 81300424 A 19810202

Priority

GB 8003591 A 19800202
GB 8004427 A 19800209

Abstract (en)

[origin: EP0033654A2] 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

E21B 10/60; E21B 21/00; E21B 7/18; E21B 33/138

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)

Citation (search report)

[X] US 3175629 A 19650330 - ROWLEY DAVID S
[X] US 2293259 A 19420818 - JOHNSON CLYDE D
[X] AU 4112972 A 19731018 - BAYLISS AGENCIES J PTY LTD
US 3112803 A 19631203 - ROWLEY DAVID S
US 4091988 A 19780530 - BODINE ALBERT G, et al
US 3788408 A 19740129 - DYSART T
US 3924695 A 19751209 - KENNEDY JOHN R
US 2609182 A 19520902 - ARMAIS ARUTUNOFF
US 2783716 A 19570305 - VARNER JOHN J
US 2652130 A 19530915 - FERGUSON CEDRIC K

Designated contracting state (EPC)

BE CH DE FR GB 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