REAL-TIME DATA
ANALYSIS
Top Drive Diagnostics
HOOK LOAD
& TORQUE
VERIFICATION
The Torque Sub is used to regularly verify the top drive and rig tong torque outputs. This is to ensure that they are accurate and to reduce damage to the rotary shoulder connections during make-up. Regular verifications help to prevent downtime, equipment failure, repair costs and can extend the service life of your drill pipe.
Top Drive Diagnostics
HOOK LOAD
& TORQUE
VERIFICATION
SPECS
- TORQUE CAPACITY: 40,000 to 50,000 ft/lbs (54,200 to 67,700 Nm)
- HOIST CAPACITY: 750,000 to 1,000,000 lbs (375 to 500 tons)
- WEIGHT: Approx 350 lbs (160 kg)
- SUB LENGTH: 18.6 to 22 in (472.4 to 558.8 mm)
**Specialty weights, lengths and capacities will depend on customer drill pipe specifications
- 1 in 20 wells experience a "back-off" or "twist-off" event
- The average cost is $400,000 per event
- 30 to 35% of top drives deliver inaccurate drill pipe connection torques
- 1 in 4 top drives are out of calibration by more than 10%
Why It Matters
Top drive torque output drifts over time. A connection made up at the wrong torque value can compromise the entire wellbore. Routine verification with the Torque Sub catches drift before it becomes a back-off, a fishing job, or a sidetrack.
