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
Sheiretov Todor K, Post Roger A, Robson Robert I, Cordera Joseph F: Connector latch. Schlumberger Technology, Schlumberger Holdings, September 4, 2002: EP1236859-A2 (1 worldwide citation)

A connector latch includes a housing body having an internal cavity, a grippable member slidably coupled to the housing body, and a hydraulic mechanism on the housing body for delaying sliding of the housing body relative to the grippable member when an external force is applied to the housing body.


4
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 ...


5
Aguirre Franz, Sheiretov Todor K, Nelson Keith R: Self-aligning open-hole tractor. Schlumberger Canada, Services Petroliers Schlumberger, Schlumberger Holdings, Schlumberger Technology, Prad Research And Development, Aguirre Franz, Sheiretov Todor K, Nelson Keith R, CATE David, August 28, 2008: WO/2008/102280 (1 worldwide citation)

A downhole tractor assembly (fig 1) that is configured for open-hole applications and of a self-aligning nature. The self -aligning nature of the assembly is effectuated through a tractor portion (150) which is rotable about an axis (180) of an elongated body (100) of the assembly independent of a s ...


6
MONTOIS MICHAEL, SHEIRETOV TODOR K: [en] Downhole load sharing motor assembly. SCHLUMBERGER HOLDINGS, June 23, 2010: GB2466408-A

[en] A motor assembly of multiple motors for use in driving a shared downhole load within a well. In particular, the assembly may employ substantially constant adjustable speed motors. These may include permanent magnet synchronous machine motors. The motors may be configured to operate at given spe ...


7
Martinez Ruben, Billingham Matthew, Sheiretov Todor K, Beguin Paul J: Intervention tool with operational parameter senors. Schlumberger Holdings, January 28, 2009: GB2451370-A

An intervention tool (100) for use inside a wellbore is provided that includes an intervention module (70) capable of performing an intervention operation downhole, and a drive electronics module (40) in communication with the intervention module and configured to control the intervention module. Th ...


8
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 ...


9
SHEIRETOV TODOR K, MCCOY MATTHEW, CAMPO CHRISTOPHER S DEL: [en] Method and apparatus for pipe conveyed well logging. SCHLUMBERGER HOLDINGS, November 18, 2009: GB2459991-A

[en] A well logging instrument deployment device includes a housing configured to be coupled to a pipe string. A carrier sub is disposed inside the housing and configured to move longitudinally inside the housing. At least one well logging instrument is coupled to the carrier sub. A latch is configu ...


10
Bissonnette Harold Steven, Sheiretov Todor K, Campo Christopher S Del, Mccoy Matthew: Carrier assembly for a pipe conveyed well logging assembly. Schlumberger Holdings, August 26, 2009: GB2457566-A

A pipe conveyed well logging assembly (10 figure 1) is provided comprising a pipe string (12 figure 1); a carrier assembly 20 connected to the pipe string (12 figure 1) with an inner and outer housing 36 and 38; and a memory logging tool 24 carried by the carrier assembly 20. The memory logging tool ...