The logging while tractoring toolstring has a dual conductor Swivel, Head Tension and CCL. An upgraded tractor electronics section allows a three-conductor wireline to log data while tractoring.
The MDT bi-directional, electro-mechanical tractors enable data from passenger tools below the tractor to be acquired while the tractor is driving in hole. A three conductor wireline is typically deployed. One conductor is dedicated to the logging tool string while another powers and controls the tractor. The logging while tractoring tool string has a dual conductor Swivel, Head Tension and CCL as well as an upgraded tractor electronics section. Consequently, data can be acquired from the tools being conveyed while the tractor is driving.
A tractor engineer monitors various parameters in real-time to control the MDT with precision. For example, tractor wheel speed and distance driven allow the engineer to ensure that the speed the tractor is being driven equals the speed that wireline is being spooled in hole. The MDT has a self-gripping wheel mechanism and a protection circuit to isolate the logging tools below from tractor Voltage.
The real-time depth, tension, and cable-head tension data acquired during an intervention is integrated with calculated forces predicted by WEST (Well Entry Simulation Tool). This comparison happens in real-time during an operation and provides a robust approach to intervention risk management.
WEST is a powerful pre-job planning application that enables an engineer to identify the best choice of wireline and toolstring configuration, to identify the expected forces in advance, and to monitor the real-world forces in comparison with those predicted during an operation.
For perforating applications an Addressable Downhole Switch (ADS) provides safe electrical isolation between the explosives and the tractor.
- Real-time log of CCL, Head Tension, Tractor Load, Tractor Speed, and Arm Position
- DC powered Tractor drives both uphole and downhole
- Modular drive sections
- WEST simulation software for pre-job planning
- Real-time data integrates with WEST model during intervention
- Helicopter transportable
- Low cost alternative to coil tubing deployment
- Self-gripping wheel traction mechanism