Global Patent Index - EP 1254299 A2

EP 1254299 A2 2002-11-06 - DRILL PIPE TORQUE-REDUCTION AND PROTECTION APPARATUS

Title (en)

DRILL PIPE TORQUE-REDUCTION AND PROTECTION APPARATUS

Title (de)

VORRICHTUNG ZUM SCHUTZ VON BOHRGESTÄNGEN UND ZUR VERRINGERUNG VON TORSION

Title (fr)

APPAREIL DE PROTECTION ET DE REDUCTION DU COUPLE D'UNE TIGE DE FORAGE

Publication

EP 1254299 A2 (EN)

Application

EP 01904095 A

Priority

  • GB 0100486 W
  • GB 0002916 A

Abstract (en)

[origin: WO0159249A2] A torque-reduction and/or protection device for use in a drill string comprises a generally cylindrical body (10) including a mandrel portion (18) and a rotatable collar (20) mounted on the mandrel portion between first and second shoulders (22, 24), one of which is defined by a ring member (24) secured to said body after the collar has been located. A low friction bearing is provided between the collar and the mandrel including at least one of the following on the bearing surfaces of each of the collar and mandrel: low friction alloy coating; low friction ceramic coating; low friction alloy insert; low friction ceramic insert; magnetic elements. The collar has a low friction coating (30) on its outer surface comprising a composite coating having an inner layer of hard low friction material and an outer coating of relatively softer low friction material. The device may be incorporated into a sub but is preferably incorporated in a tool joint of a length of drill pipe.

IPC 1-7 (main, further and additional classification)

E21B 17/00

IPC 8 full level (invention and additional information)

E21B 17/10 (2006.01)

CPC (invention and additional information)

E21B 17/1064 (2013.01)

Citation (search report)

See references of WO 0159249A3

Designated contracting state (EPC)

AT BE FR GB

EPO simple patent family

WO 0159249 A2 20010816; WO 0159249 A3 20020131; AU 3201401 A 20010820; EP 1254299 A2 20021106; GB 0002916 D0 20000329; NO 20023760 A 20020903; NO 20023760 D0 20020808

INPADOC legal status


2004-05-26 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): AT BE FR GB

2004-05-06 [REG DE 8566] DESIGNATED COUNTRY DE NOT LONGER VALID

2004-03-31 [18W] APPLICATION WITHDRAWN

- Effective date: 20040206

2002-11-06 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020820

2002-11-06 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-11-06 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI