bent sub meaning
[Oil and gas]
A sub used on top of a downhole motor to give a "non-straight" bottom assembly. One of the connecting threads is machined at an angle to the axis of the body of the sub.
A sub used on top of a downhole motor to give a "non-straight" bottom assembly. One of the connecting threads is machined at an angle to the axis of the body of the sub.
Examples
- MWD tools also generally provide toolface measurements to aid in directional drilling using downhole mud motors with bent subs or bent housings.
- A piece of bent pipe ( a " bent sub " ) between the stationary drill pipe and the top of the motor allowed the direction of the wellbore to be changed without needing to pull all the drill pipe out and place another whipstock.
