Method for evaluating fastening state of threaded joint of...

G - Physics – 01 – N

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G01N 29/00 (2006.01) F16L 15/04 (2006.01) G01N 29/04 (2006.01)

Patent

CA 2756744

The present invention provides a method which allows simply, easily and accurately evaluating the fastening state of shoulder parts of a threaded joint for use as a joint of pipes or tubes, such as OCTG, during fastening or after fastening. The fastening state evaluation method for a threaded joint 100 of pipes or tubes according to the present invention is characterized in that it transmits ultrasonic surface waves from the internal surface of either one of the pin 1 and the box 2 toward the internal surface of the other one of the pin 1 and the box 2 through the shoulder parts 13, 23 of the pin 1 and the box 2, and on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determines whether or not the fastening state of the threaded joint 100 is satisfactory.

L'invention porte sur un procédé qui peut évaluer l'état de raccordement de la partie épaulement d'un raccord fileté utilisé comme raccord dans des tuyauteries, tels que des tuyaux pour puits de pétrole, ladite évaluation ayant lieu pendant ou après le raccordement, d'une manière simple et précise. Le procédé d'évaluation de l'état de raccordement d'un raccord fileté de tuyauterie (100) est caractérisé par l'émission d'une onde de surface ultrasonore, à partir de la surface intérieure d'un élément mâle (1) ou d'un élément femelle (2), en passant par la partie épaulement (13, 23) de l'élément mâle (1) ou de l'élément femelle (2), vers la surface intérieure de celui de l'élément mâle (1) et de l'élément femelle (2) qui ne se trouve pas en le point d'origine de l'onde de surface, et la détermination de la qualité de l'état de raccordement du raccord fileté de tuyauterie (100) sur la base de l'intensité de l'onde transmise ou de l'intensité de l'onde réfléchie.

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