Halliburton Energy Services, Inc.

Guosheng Jin

William Joseph Schaecher

Alberto Quintero

Matthew L Lee

Joni Lie

Boon Buan Lim

Winston Alfred Rodrigues

Xiaohong Zhang

Nikhil Satyawan Dalvi

A wellbore tractor is provided. The wellbore tractor includes a single hydraulic line and at least one valve disposed along the single hydraulic line. At least two pairs of drives hydraulically coupled with the single hydraulic line such that the single hydraulic line can control the drives to open and/or close. A valve can be disposed along the single hydraulic line between each pair of drives. By controlling the opening and/or closing of each valve, along with controlling the inflow or removal of fluid in the hydraulic line, each pair of drives can be individually controlled to maneuver the wellbore tractor.

Wellbore tractor with independent drives

In a logging system (), multiple receiver units () are synchronized over a control area network (CAN) bus () without use of separate differential lines. A ready for synchronization command is received over the CAN bus (). In response to receiving the ready for synchronization command, a start synchronization interrupt is enabled. A start synchronization command is then received over the CAN bus (). In response to receiving the start synchronization command, the start synchronization interrupt is triggered for capturing formation signals which are produced responsive to excitation signals from a transmitter unit ().

Synchronization of receiver units over a control area network bus

Growing community of inventors

Singapore, Singapore

Guosheng Jin