Method and system for controlling tongs make-up speed and evaluating and controlling torque at the tongs
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United States of America Patent
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Nov 26, 2013
Grant Date -
Jun 3, 2010
app pub date -
Nov 30, 2009
filing date -
Nov 28, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Make-up speed for a tongs drive system is monitored and controlled to maintain the speed within a limited target range either throughout the make-up process or during the final portion of the make-up process, thereby improving make-up consistency and allowing for improved evaluation or torque during the make-up process. An encoder generates speed and position data during the make-up process. The speed data is compared to a target speed, which is based on rod and/or tongs characteristics. If the speed does not match the target speed or is not within a range of the target speed, a signal is transmitted to the tongs drive to adjust the speed accordingly. Furthermore, position data from the encoder, or other position sensors, provide position data for the rod during the make-up process to limit or vary the speed control parameters during different portions of the make-up process.
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