1
Sheiretov Todor K, Post Roger A, Roy Carl J, Cordera F Joseph: Constant force actuator. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, September 17, 2003: EP1344893-A2 (34 worldwide citation)

The invention provides 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 ...


2
Post Roger A, Sheiretov Todor K, Roy Carl J, Cordera Joseph F: Bi-directional grip mechanism for a wide range of bore sizes. Schlumberger Technology, Schlumberger Holdings, February 5, 2003: EP1281834-A1 (24 worldwide citation)

A linkage apparatus for selectively gripping and releasing the inside walls of a conduit, the apparatus comprising: a first arm (33); a bi-directional gripping cam (70) rotatably attached to the arm; and an extension and locking device (36,8) adapted to selectively radially extend the arm from a too ...


3
Doering Falk W, Roy Carl J: Constant force actuator. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, October 17, 2007: EP1845230-A1 (5 worldwide citation)

A radially expandable tool (10) is provided that includes a tool body and a radially moveable member coupled to the tool body (26) 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 plurali ...


4
Guerrero Julio, Doering Falk W, Roy Carl J, Beguin Paul J: Open hole tractor with tracks. Schlumberger Holdings, April 12, 2006: GB2418946-A (1 worldwide citation)

A downhole tractor (10) 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 ass ...


5
Guerrero Julio C, Doering Falk W, Roy Carl J, Beguin Paul J: Open hole tractor with tracks. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Sofitech, Guerrero Julio C, Doering Falk W, Roy Carl J, Beguin Paul J, NAVA Robin, January 27, 2005: WO/2005/008023 (1 worldwide citation)

A downhole tractor (10) 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 ass ...


6
Sheiretov Todor K, Chilcoat Dwight C, Ewan Robin A, Roy Carl J, Billingham Matthew, Aguirre Franz: Self-anchoring device with force amplification. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Prad Research And Development, Sheiretov Todor K, Chilcoat Dwight C, Ewan Robin A, Roy Carl J, Billingham Matthew, Aguirre Franz, CURINGTON TIM, August 16, 2007: WO/2007/091218 (1 worldwide citation)

A downhole tool is provided that includes a grip assembly (312) for contacting a well formation. The grip assembly includes a gripper body (36); 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 devic ...


7
Roy Carl J, Billingham Matthew, Aguirre Franz, Sheiretov Todor K, Chilcoat Dwight, Ewan A Robin: Self-anchoring device with force amplification. Schlumberger Holdings, December 3, 2008: GB2449785-A

A downhole tool is provided that includes a grip assembly (312) for contacting a well formation. The grip assembly includes a gripper body (36); 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 devic ...


8
Sallwasser Alan J, Post Roger A, Roy Carl J: Transport dun instrument de diagraphie dans un puits non vertical, Conveying a tool along a non-vertical well. Schlumberger Canada, Schlumberger Canada, SMART & BIGGAR, April 22, 2003: CA2271509

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


9
Roy Carl J, Cordera Joseph F, Post Roger A, Sheiretov Todor K: Actionneur a force constante, Constant force actuator. Schlumberger Canada, Schlumberger Canada, SMART & BIGGAR, March 11, 2008: CA2421707

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 ...


10
Post Roger A, Sheiretov Todor K, Roy Carl J, Cordera Joseph F: Mecanisme de serrage bidirectionnel pour plusieurs dimensions de puits, Bi-directional grip mechanism for a wide range of bore sizes. Schlumberger Canada, Schlumberger Canada, SMART & BIGGAR, June 6, 2006: CA2396822

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 ...