When the drill string get stuck, there are several ways to free the string as using Jar (up and/or down), straight pull, working torque down, etc. Pulling stuck pipe with torque in the drill string is one of those technique which often utilize to free the stuck drill string. However, there are some concerns that you should know before doing this because torque in the string will reduce a tensile capacity of tubular. This is very important to read and understand the combined load chart (Torque‐Tension Graph) in order to determine the limitation before pulling the pipe.
For this example, we use 5” DP, S-135, NC50 (4-1/2” IF connection) to be a reference figure.
- Pipe Size and Weight: 5.000″ 19.50ppf 0.362″ wall IEU
- Pipe Grade: S-135
- Range: 2
- Tool Joint: 6.625″ X 3.250″ NC50
- Tool Joint 120,000 psi Material Yield Strength
- Premium class