MAKE-UP/BREAK-OUT EVALUATION METHOD FOR THREADED JOINT FOR OIL COUNTRY TUBULAR GOODS
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United States of America
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Issued Date -
Mar 13, 2025
app pub date -
Mar 8, 2022
filing date -
Mar 8, 2022
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Abstract
A make-up/break-out evaluation method that makes it possible to evaluate the seizure resistance of a threaded joint for oil country tubular goods accurately without performing a test using a threaded joint with an actual length. When performing test with respect to the threaded joint for oil country tubular goods formed by attaching a pin lower portion to box upper portion with its axis directed vertically, a test pin formed by a pin shorter than an evaluation target pin used as test pin; a weight attached to test pin upper portion; mass of the weight is equal to or greater than a mass obtained by subtracting the test pin mass from the evaluation target pin mass; an initial set position for test pin is set where test pin five crests or ¼ of all test pin crests, whichever is greater, or more are exposed from the box upper end face.
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