Threaded connection for oil country tubular goods and its method of manufacturing
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United States of America Patent
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May 29, 2001
Issued Date -
N/A
app pub date -
Jun 4, 1999
filing date -
Oct 8, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
[Purpose] To provide a threaded connection capable of preventing deterioration of gas tightness from occurring when a tensile stress acts thereon after a compressive force in the direction of the axis of a pipe is applied. [Means of Solving Problems] (1) A threaded connection for oil country tubular goods wherein a length (15) of a thick walled portion with a diameter defined in the formula (1), is longer than the length (16) from seal contact to the extremist of the pin section, shorter than a half of the length (17) of the pin section, the rest of inside diameter is equal to the inside diameter of pipe proper, having smooth tapered inner wall between thick walled portion and pipe proper. The inside diameter of the box section of torque shoulder section is the same as inside diameter of thick wall. d0>dx.gtoreq.d0-6 mm (1) Where dx(mm)=inside diameter of the thick walled portion of the pin section, and d0(mm)=inside diameter of the pipe proper.
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