Available now: 7G Drill string limitsRIGLOGICOS / SOLUTIONS
Wellbore · API RP 7G

7G Drill string
limits.

Drill-stem design and operating limits to API RP 7G. See how much tension, torque and overpull the string can take together, before anyone pulls on it.

For: drilling engineers, drilling contractors, directional drilling teams.

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Pull and turn the stringTension along the string · combined-load envelope
5 in 19.5 lb/ft S-135
Overpull margin Grey: hanging · teal: with overpull
Tool joint make-up torque Pipe body yield
Hookload, hanging291 kips
Tension at surface391 kips
Margin of overpull349 kips
Torque limit here38.0 kft·lb
Tension within allowable Torque within limit

New 5 in 19.5 lb/ft S-135 pipe body: 712 kip tensile yield, 74.1 kft·lb torsional yield, 0.9 design factor on tension. 800 ft of 91.8 lb/ft collars, buoyed in mud. Tool joint limit is an example value. Not for design.

What the module covers

Every limit on the string, checked together.

A drill string fails where loads combine: tension reduces the torque the pipe can carry, connections have their own limits, and doglegs add fatigue. The drill string module checks them together and reports the margin left on each.

  • Tension, torsion and combined loadsWith the margin of overpull.
  • Rotary-shouldered connectionsBending strength ratio and make-up torque.
  • Dogleg severity limitsFor fatigue.
  • Critical rotary speedsSpeeds to avoid for the string in the hole.
From your rig file
Casing program · reusedPipe ratings (5C3) · reusedDrill string · newWell path · new
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Request access See 5C3 pipe strength