The simple, robust TuffTRAC and TuffTRAC Mono cased hole services tractors are the shortest tractors available and the only tractors with reverse tractoring and traction control capability in highly deviated wells. With low sensitivity to borehole conditions, TuffTRAC tractors can deploy any of our cased hole services, including perforating, production logging, cement and corrosion evaluation, ReSOLVE instrumented wireline intervention, plug setting, and ABC analysis behind casing services. The TuffTRAC Mono tractor combines with a telemetry cartridge to provide logging while tractoring with precise speed control.
The modular TuffTRAC design has low power requirements but can achieve a maximum speed of 3,200 ft/h and is compatible with all multiconductor wireline cables. The similarly low-powered TuffTRAC Mono tractor can also be run on monocable for while-tractoring logging passes at up to 2,400 ft/h.
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 safety, reliability, and versatility of operation. TuffTRAC 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. The TuffTRAC Mono tractor can accommodate up to six drive sections.
The electromechanically driven TuffTRAC 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 and the tractor does not have to be stopped to cool down, even in dry gas wells.
Exclusive to TuffTRAC operations, active traction control continuously controls the radial force applied by the tractor arms. If slippage is detected, the radial force can be increased 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, the TuffTRAC drives can achieve the same tractoring force in borehole IDs from 3.4 to 10.6 in [8.6 to 26.9 cm].