1
Alan J Sallwasser, Roger A Post, Carl J Roy: Conveying a tool along a non-vertical well. Schlumberger Technology Corporation, John J Ryberg, Brigitte L Jeffery, January 30, 2001: US06179055 (76 worldwide citation)

A conveyance apparatus for conveying at least one logging tool through an earth formation traversed by a horizontal or highly deviated borehole. The conveyance apparatus comprises a pair of arcuate-shaped cams pivotally mounted to a support member, a spring member for biasing the arcuate surface of ...


2
Roger A Post, Todor K Sheiretov, Carl J Roy, Joseph F Cordera: Bi-directional grip mechanism for a wide range of bore sizes. Schlumberger Technology Corporation, Wayne I Kanak, Brigitte L Jeffery, John J Ryberg, October 7, 2003: US06629568 (52 worldwide citation)

A linkage apparatus for selectively gripping and releasing the inside walls of a conduit, the apparatus comprising: a first arm; a bi-directional gripping cam rotatably attached to the arm; and an extension and locking device adapted to selectively radially extend the arm from a tool housing to an i ...


3
Todor K Sheiretov, Roger A Post, Carl J Roy, Joseph F Cordera: Constant force actuator. Schlumberger Technology Corporation, Wayne Kanak, Robin Nava, Tim Curington, July 26, 2005: US06920936 (39 worldwide citation)

A substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more force transmitting memb ...


4
Falk W Doering, Carl J Roy: Constant force actuator. Schlumberger Technology Corporation, Rodney Warfford, David Cate, Jaime Castano, February 26, 2008: US07334642 (25 worldwide citation)

A radially expandable tool is provided that includes a tool body and a radially moveable member coupled to the tool body and in force receiving relation to a constant force actuator. The radially moveable member is movable by the constant force actuator from an closed position to a plurality of radi ...


5
Todor K Sheiretov, Dwight C Chilcoat, Robin A Ewan, Carl J Roy, Matthew Billingham, Franz Aguirre: Self-anchoring device with force amplification. Schlumberger Technology Corporation, Rodney Warfford, David Cate, Jaime Castano, April 14, 2009: US07516782 (23 worldwide citation)

A downhole tool is provided that includes a grip assembly for contacting a well formation. The grip assembly includes a gripper body; and a centralizer that is attached to and radially expandable with respect to the gripper body and that has a geometry which is lockable by a locking device. The grip ...


6
Julio C Guerrero, Falk W Doering, Carl J Roy, Paul J Beguin: Open hole tractor with tracks. Schlumberger Technology, Rodney Warfford, Tim Curington, Bill Batzer, January 2, 2007: US07156192 (15 worldwide citation)

A downhole tractor is provided that may be used in open or cased wells, and is also designed for use in open holes having a variety of soil/formation consistencies (e.g., soft, firm, rigid, etc.), varying diameters and non-uniform and irregular bore profiles. The tractor may include a track assembly ...


7
Todor K Sheiretov, Dwight C Chilcoat, Robin A Ewan, Carl J Roy, Matthew Billingham, Franz Aguirre: Self-anchoring device with force amplification. Schlumberger Technology Corporation, Michael Flynn, David Hofman, Jody Destefanis, December 21, 2010: US07854258 (13 worldwide citation)

A downhole tool is provided that includes a grip assembly for contacting a well formation. The grip assembly includes a gripper body; and a centralizer that is attached to and radially expandable with respect to the gripper body and that has a geometry which is lockable by a locking device. The grip ...


8
Julio C Guerrero, Falk W Doering, Carl J Roy, Paul J Beguin: Open hole tractor with tracks. Schlumberger Conveyance And Delivery, February 17, 2005: US20050034874-A1

A downhole tractor is provided that may be used in open or cased wells, and is also designed for use in open holes having a variety of soil/formation consistencies (e.g., soft, firm, rigid, etc.), varying diameters and non-uniform and irregular bore profiles. The tractor may include a track assembly ...


9
Todor K Sheiretov, Dwight C Chilcoat, Robin A Ewan, Carl J Roy, Matthew Billingham, Franz Aguirre: Self-anchoring device with force amplification. Schlumberger Ipc, August 9, 2007: US20070181298-A1

A downhole tool is provided that includes a grip assembly for contacting a well formation. The grip assembly includes a gripper body; and a centralizer that is attached to and radially expandable with respect to the gripper body and that has a geometry which is lockable by a locking device. The grip ...


10
Todor K Sheiretov, Roger A Post, Carl J Roy, Joseph F Cordera: Constant force actuator. Schlumberger Conveyance And Delivery, September 18, 2003: US20030173076-A1

A substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more force transmitting memb ...