E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) B25B 21/00 (2006.01) B25B 23/14 (2006.01) B25B 23/145 (2006.01) E21B 19/06 (2006.01) E21B 19/16 (2006.01)
Patent
CA 2360238
A sucker rod tool system for oil wells monitors both torque and angular displacement of a three-element sucker rod connection. The tool system engages two sucker rods that are at least partially screwed into opposite ends of a sucker rod coupling. The system, however, does not engage the coupling adjoining both rods. The system determines whether a connection has been properly tightened by sensing the torque and angular displacement of the connection as it is being tightened, and comparing the data to a stored reference set of data or curves. In some embodiments, a properly tightened connection is based upon the number of straight lines that are needed to adequately approximate a plotted curve of the sensed torque versus angular displacement. Tightness of each connection of a string of sucker rods is recorded with reference to each connection's depth within a well to later serve as an aide in diagnosing connection failures. In some cases, the energy required to unscrew a connection is also recorded. In some embodiments, the system automatically determines whether one or both sucker rods of a three-element connection need to be tightened.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Key Energy Services Inc.
Newman Frederic M.
LandOfFree
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