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Drill Collar Sizes & Make up torque Tables & Charts

API Drilling Collar Selections

Woods and Lubinski pointed out that using an unstabilized Drilling Bit and small OD drill collar size can cause an undersized hole, making it difficult for Casing Running. They determined that the actual drift, or useful diameter, of the hole would be equal to the bit diameter plus the drill collar diameter, divided by two,

Drill Collar Size Selection

The above equation can be rewritten to determine the minimum drill collar OD which would insure passage of the larger Casing  & Casing Coupling diameter. Substituting casing coupling diameter for drift diameter,

As a general rule, the largest drill collar size that can be washed over and fished out should be selected for the best BHA Design.  WHY

API Drill Collar Sizes

Drill collar sizes are ranging from 2 3/8″ to 12″ in below table you will find the weights for each size. You can used the OD and ID of the drill collar and you will get the drill collar weight

Drill Collar Sizes & weight
Drill Collar Weight in Kg/m
Drill Collar Sizes & weight
Drill Collar Weight in lbs/ft

API Drill Collar Make Up Torque 

Drill Collar Connections And Make Up Torque
Drill Collar Make Up Torque 1
Drill Collar Connections And Make Up Torque
Drill Collar Make Up Torque 2

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