Method and system for evaluating rod breakout based on tong...

Details Method and system for evaluating rod breakout based on tong... Method and system for evaluating rod breakout based on tong...

2007-09-05

2009-12-15

Fitzgerald, John (Department: 2856)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

07631563

ABSTRACT:
A method for evaluating rod quality and wellbore dynamics includes receiving information about the rod size and tong type for a rod pulling operation. Expected breakout pressures can be determined based on the rod size and/or tong type and can be input into an evaluation system. Upper and lower limits for acceptable rod breakout pressures can be calculated based on the expected breakout pressure and/or rod size. Actual rod breakout pressures can be evaluated while pulling rods from a well and compared to the upper and lower limits. Rod breakout pressures below the lower limit or above the upper limit can generate an alarm notifying a rig operator to evaluate the condition of the rod to determine if the rod can be reused. The rod breakout pressures can be recorded as breakout pressure data for further evaluation, including determinations of improper rod make-up and poor well conditions.

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