Jc inJp in

The resistance to torsional buckling of the collars and the drillpipe are

BT8<.= [(833,333 * 197 * {2056168 * 197 ,40000} ]

BT8" = O at all points where the compression is 2,531 lbs or greater

BT5" = [ (833,333 * 14.3 * {2056168 * 14-3 + 0 } ] "5 = 1,872 lb-ft


The amount of torque placed on the drillpipe by collars is

Thus, the drillpipe will helically buckle by the torque placed on it by the drill collars if the bit hangs-up. However, that portion of the BHA is thought to be in tension, and will not be buckled by bit hang-up.

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