Method for judging angle of oil casing knuckle thread form
A technology of oil casing and determination method, which is applied in the direction of casing, drill pipe, earth-moving drilling, etc., can solve the problem that the thread profile angle of oil casing is difficult to accurately determine, and achieves easy measurement, accurate reflection and high detection efficiency. Effect
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[0021] The content of the present invention will be further described in detail below in conjunction with specific embodiments:
[0022] A method for judging the thread profile angle of a petroleum casing pipe includes the following steps:
[0023] 1) After the casing thread processing is completed, use the thread height gauge to measure the thread height deviation h;
[0024] 2) Judgment conditions:
[0025] Among them, H is the theoretical thread height of round thread;
[0026] S s The thread reduction value specified by the standard;
[0027] p is the thread pitch;
[0028] A is the upper limit of thread profile angle specified by the standard, K is the processing correction coefficient;
[0029] 3) When the measured thread profile height deviation h meets the judgment conditions, the thread profile angle is determined to be qualified, otherwise it is unqualified.
[0030] The above-mentioned processing correction coefficient K is determined by the following method: adopt the casings p...
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