EP 1162344 A1 20011212 - Friction reducing drillstring component
Title (en)
Friction reducing drillstring component
Title (de)
Reibungsreduzierender Teil eines Bohrgestänges
Title (fr)
Elément de tige de forage à réduction de frottement
Publication
Application
Priority
GB 0006218 A 20000316
Abstract (en)
A friction and/or torque reducing drillstring component has a one-piece mandrel body 5 with a mandrel body recess 13c considerably smaller than mandrel upper neck 13a and mandrel body lower neck 13b, dressed with an outer sleeve 18 which is interlocked with a two-piece inner bearing 20 through several integral dove-tailed splines 22b and grooves 22a. The combination of the outer sleeve 18 and inner bearing 20 is restricted in vertical movement over the said mandrel body 5 by an integral, optionally spirally, bladed first stop 15 and a removable second stop 16. The removable second stop 16 is locked onto the mandrel body upper neck 13a by means of threaded retaining bolts 24. Once the second stop 16 is removed, the one-piece outer sleeve 18 is retractable over the mandrel body upper neck 13a to allow the removal of the two-piece inner bearing 20. A second inner bearing 155 may also be provided. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 17/10 (2006.01)
CPC (source: EP US)
E21B 17/1064 (2013.01 - EP US)
Citation (search report)
- [X] US 2815930 A 19571210 - STORM LYNN W
- [X] US 4989679 A 19910205 - AMAUDRIC DU CHAFFAUT BENOIT [FR]
- [X] WO 0001239 A2 20000113 - DRILLTECH SERVICES ASIA PTE LT [SG], et al
- [X] US 6032748 A 20000307 - DEBRAY HAROLD J [US], et al
- [X] WO 9708423 A1 19970306 - DRILLTECH SERV NORTH SEA LTD [GB], et al
- [X] EP 0721539 A1 19960717 - HERRERA DEREK [GB]
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
GB 0106480 D0 20010502; GB 2360305 A 20010919; GB 2360305 A9 20011010; EP 1162344 A1 20011212; GB 0006218 D0 20000503; US 2002129976 A1 20020919
DOCDB simple family (application)
GB 0106480 A 20010316; EP 01302461 A 20010316; GB 0006218 A 20000316; US 81071101 A 20010316