SCREW JOINT FOR OIL WELL PIPING

A screw joint for oil well piping excellent in sealing property, wherein a load flank .theta.1 meets specified requirements, such a form that the inclined surfaces of a trapezoidal screw on both sides are brought into contact simultaneously when the screw joint is tightened so that an interference ....

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	NISHI, MASATSUGU, SUZUKI, TERUAKI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A screw joint for oil well piping excellent in sealing property, wherein a load flank .theta.1 meets specified requirements, such a form that the inclined surfaces of a trapezoidal screw on both sides are brought into contact simultaneously when the screw joint is tightened so that an interference .DELTA.d of at least 0.12 % of the outer diameter and with 0.8 % or less of the outer diameter in hoop stress is given is provided to a screw part, a clearance formed between the crest and root of the trapezoidal screw is reduced to 0.2 mm or less, and dimensional tolerances of the screw width and screw crest height meet specified requirements.