EP 0335543 A1 19891004 - Drilling apparatus.
Title (en)
Drilling apparatus.
Title (de)
Bohrvorrichtung.
Title (fr)
Dispositif de forage.
Publication
Application
Priority
GB 8806506 A 19880318
Abstract (en)
Drilling apparatus comprises a hollow drill pipe (2) extending through a drill hole (4) to a mud motor (8). The motor (8) drives a compressor (12) through a shaft (14). An annular passageway (16) around the compressor (12) leads to a drill bit (18) having nozzles (20) providing an outlet from the passageway (16). A housing (22) of the compressor (12) provides a passageway (24) for leading fluid through the compressor (12) to emerge through nozzles (26) in the drill bit (18) at increased pressure to assist the drill bit (18).
IPC 1-7
IPC 8 full level
E21B 4/00 (2006.01); E21B 4/02 (2006.01); E21B 7/18 (2006.01); E21B 21/00 (2006.01); F04C 5/00 (2006.01)
CPC (source: EP)
E21B 4/00 (2013.01); E21B 4/02 (2013.01); E21B 7/18 (2013.01); E21B 21/00 (2013.01); F04C 5/00 (2013.01)
Citation (search report)
- [X] FR 2445887 A1 19800801 - PETROLES CIE FRANCAISE
- [Y] US 4391572 A 19830705 - LEW HYOK S [US]
- [Y] EP 0204474 A1 19861210 - ANALYST INT SA [IT]
- [X] FR 1271127 A 19610908 - EUROP DE TURBOFORAGE SOC
- [X] US 3897836 A 19750805 - HALL J MICHAEL, et al
- [X] US 4047581 A 19770913 - ERICKSON JOHN W
- [A] GB 2102073 A 19830126 - COSTARELLI EDOARDO [IT], et al
- [A] US 3951576 A 19760420 - LOFQUIST JR ALDEN A
- [A] US 2946291 A 19600726 - ADOLF ROEBIG
- [A] US 4187061 A 19800205 - JURGENS RAINER [DE]
- [A] GB 2190411 A 19871118 - SHELL INT RESEARCH
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 89302703 A 19890320; GB 8806506 A 19880318