A 2 1 class bit record (non sealed bearing used with oil base mud) collected from the off set well gives the following information D 200 ft tb 8 hours WOB 40000 lbf db 8 5 in hf 0 75 RPM 80 B 20 5 hours a Calculate the final wear of bearings for this bit b Calculate the predicted bearings life c Ca...

solution I 30m standard chain Length Radius 30x10 300m Chaimage of intersection 1 78 30 34 13 ...

A 2-1 class bit record (non-sealed bearing used with oil-base mud) collected from the off-set well gives

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A 2-1 class bit record (non-sealed bearing used with oil-base mud) collected from the off-set well gives the following information: ΔD= 200 ft tb= 8 hours WOB = 40000 lbf db= 8.5 in hf= 0.75 RPM=80 τB=20.5 hours
a. Calculate the final wear of bearings for this bit.
b. Calculate the predicted bearings life.
c. Calculate Abrasiveness Constant τH for this bit.
d. Calculate the predicted teeth life.
e. Determine the predicted bit life.