The free point tool run on electric line to determine stress and strain in a stuck drill string, casing string, or tubing string has three different configurations. The three different anchoring mechanisms transmit a stress or strain, over-pull, or torque to a strain gauge, which in turn sends various levels of current to the surface for interpretation. These anchors are knives, magnets, or adjustable bow springs. The commonly used configuration is the knife type, as it anchors into the inner diameter with a positive engagement.
Drill pipe stretch table
Free point constant
Set-down and slack-off weights
Tubing stretch table
The free point tool run on electric ...
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