Torque and Weight Applications

  • Detecting Bit Cone Locking
  • Correlation at the Bit

Start Bit Run

Cone

Locking

Dimensionless Torque, TD =

1 Shale I Line

Sands

Dimensionless torque can be used to discriminate shales, ahead of the gamma ray, as the bit breaks the rock. The jump in dimensionless torque above "Shale Line" clearly indicates cone locking. Bit was pulled and graded T4 : B8 two locked cones.

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