Drilling Weight Planner

*(15% Safety Factor Built In)

Division ol Smith Inter national, inc

10 15 20 25

Drill Collar Weight in Air (lb x 1,000)

45 50 55 Publication No. E-111

10 15 20 25

Drill Collar Weight in Air (lb x 1,000)

45 50 55 Publication No. E-111

The drill off test is performed in order to ascertain the optimum combination of weight on bit and rotary speed to maximize penetration rate.

DOT should be done:

i. At the start of a bit run ii. On encountering a new formation iii. If a reduction in ROP occurs

A conscientious driller prepared to experiment will make more hole on his tour than one who "sets it and forgets it".

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