公开(公告)号：DE69206791T2

公开(公告)日：1996-06-05

申请号：DE69206791

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

公开(公告)号：DE69206139D1

公开(公告)日：1995-12-21

申请号：DE69206139

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

公开(公告)号：CA2768010C

公开(公告)日：2016-09-20

申请号：CA2768010

申请日：2006-12-12

Applicant: WEATHERFORD/LAMB INC

Inventor： ODELL ALBERT C II ,  GIROUX RICHARD LEE ,  LE TUONG THANH ,  THOMPSON GARY ,  HEIDECKE KARSTEN ,  LORENZ JOERG ,  BOUTWELL DOYLE FREDERIC JR ,  HAYES MICHAEL ,  PIETRAS BERND-GEORG

IPC: E21B19/06

Abstract: Methods and apparatus for running tubulars into and out of a wellbore. A gripping apparatus is activated with an actuator having a primary actuator and a redundant safety feature. The redundant safety feature may include one or more redundant fluid operated pistons. The gripping apparatus may include an integrated safety system adapted to prevent damage to the tubulars while making and breaking out connections between the tubulars and the tubular string.

公开(公告)号：NO317223B3

公开(公告)日：2004-09-20

申请号：NO20001393

申请日：2000-03-16

Applicant: WEATHERFORD LAMB INC

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16 ,  E21B20060101 ,  E21B19/06 ,  E21B23/04 ,  E21B31/03 ,  E21B33/126 ,  E21B43/10

公开(公告)号：AU2532199A

公开(公告)日：1999-08-30

申请号：AU2532199

申请日：1999-02-11

Applicant: LUCAS BRIAN RONALD ,  WEATHERFORD/LAMB INC

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/00 ,  E21B19/15 ,  E21B19/20

公开(公告)号：DE69210814D1

公开(公告)日：1996-06-20

申请号：DE69210814

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

Abstract: A rotary for a power tong which, in one aspect, has a master piston and cylinder which, when actuated, delivers hydraulic fluid to one or more slave hydraulic piston and cylinders which apply one or more active jaws against a pipe. The master piston and cylinder can be depressed by a plunger mounted on top of the tong housing and the active jaws can be released by opening one or both valves mounted on the rotary and actuable by depressing a ring mounted on the top of the tong housing.

公开(公告)号：NO316620B1

公开(公告)日：2004-03-08

申请号：NO20010563

申请日：2001-02-02

Applicant: WEATHERFORD/LAMB INC

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

公开(公告)号：DE69210814T2

公开(公告)日：1996-09-26

申请号：DE69210814

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

Abstract: A rotary for a power tong which, in one aspect, has a master piston and cylinder which, when actuated, delivers hydraulic fluid to one or more slave hydraulic piston and cylinders which apply one or more active jaws against a pipe. The master piston and cylinder can be depressed by a plunger mounted on top of the tong housing and the active jaws can be released by opening one or both valves mounted on the rotary and actuable by depressing a ring mounted on the top of the tong housing.

公开(公告)号：DE69206139T2

公开(公告)日：1996-04-18

申请号：DE69206139

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16

公开(公告)号：DE69206791D1

公开(公告)日：1996-01-25

申请号：DE69206791

申请日：1992-03-23

Applicant: WEATHERFORD LAMB INC N D GES D

Inventor： PIETRAS BERND-GEORG

IPC: E21B19/16