EP 0140311 A1 19850508 - Apparatus for reducing friction between rotating drill pipe and the well bore.
Title (en)
Apparatus for reducing friction between rotating drill pipe and the well bore.
Title (de)
Vorrichtung um die Reibung zwischen einem drehenden Bohrgestänge und dem Bohrloch zu vermindern.
Title (fr)
Dispositif pour réduire le frottement entre une tige de forage rotative et le trou de forage.
Publication
Application
Priority
US 54457983 A 19831024
Abstract (en)
An apparatus is disclosed for reducing the friction resisting rotation of a drill string in inclined cased or uncased well bores that includes a tubular body 20 to allow connecting into a drill string with a sleeve 30 of elastomeric material loosely mounted on the body 20 to allow rotation of the body 20 relative to the sleeve 30 to reduced the frictional resistance to rotation of the pipe string in an inclined well bore.
IPC 1-7
IPC 8 full level
E21B 17/10 (2006.01)
CPC (source: EP)
E21B 17/1042 (2013.01)
Citation (search report)
- [X] US 3103391 A 19630910
- [X] US RE31016 E 19820824
- [X] US 1985229 A 19341225 - ALLEN MORRIS C
- [X] US 1910631 A 19330523 - HERBERT OSBORNE
- [X] US 3320004 A 19670516 - GARRETT WILLIAM R
- [X] US 2813697 A 19571119 - SWART KENNETH H
- [X] US 2715552 A 19550816 - LANE JOHN J
- [A] US 1814183 A 19310714 - PATTERSON CLAUDE L
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0140311 A1 19850508; AU 3409784 A 19850502; JP S60112985 A 19850619; NO 844220 L 19850425
DOCDB simple family (application)
EP 84112654 A 19841019; AU 3409784 A 19841010; JP 22137884 A 19841023; NO 844220 A 19841023