TuffTRAC Wireline Tractor | Schlumberger

TuffTRAC

Wireline tractor

TuffTRAC wireline tractor in cased hole.

Short, modular system with reverse tractoring and traction control

The simple, robust TuffTRAC wireline tractor is the shortest tractor available and the only tractors with reverse tractoring and traction control capability in highly deviated wells. With low sensitivity to borehole conditions, the TuffTRAC tractor can deploy any of our cased hole services, including perforating, production logging, cement and corrosion evaluation, ReSOLVE instrumented wireline intervention service, plug setting, and ABC analysis behind casing services. It combines with a telemetry cartridge to provide logging while tractoring with precise speed control.

Low power, high speed

The modular TuffTRAC tractor design has low power requirements but can achieve a maximum speed of 3,200 ft/h and is compatible with all multiconductor wireline cables. At low power, it can also be run on monocable while tractoring logging passes at up to 2,400 ft/h.

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Modular operational flexibility

Despite its compact length, the TuffTRAC tractor has multiple built-in systems for electrical release, head tension, shock absorption, casing collar log, and addressable tractor perforating safety switch. The result is increased operational safety, reliability, and versatility. TuffTRAC tractor configurations typically employ two to four drive sections. Adding a tandem sub enables independent surface control of the drives above the sub from those below. Up to eight drive sections can be run to push heavy loads in difficult completions.

Powered for maneuverability

The electromechanically driven TuffTRAC tractor wheels optimize available surface power, achieving more than 45% conversion efficiency from the supplied electrical power. The low power requirements do not stress auxiliary systems nor does the tractor need stopping to cool down, even in dry gas wells.

Exclusive to TuffTRAC tractor operations, active traction control continuously controls the radial force applied by the tractor arms. If slippage is detected, the radial force can be raised to increase the traction and then decreased once the difficult section is successfully traversed. Because the radial force applied by the arms is independent of borehole size, TuffTRAC tractor drives can achieve the same tractoring force in borehole IDs from 3.4 to 10.6 in [8.6 to 26.9 cm].

TuffTRAC tractor wheel.
TuffTRAC
Wireline tractor
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