Screw joint for oil well piping

A threaded joint with trapezoidal threads for oil well pipes superior in sealing performance: having a load flank angle theta1 of each thread satisfying desired conditions; having a shape of the thread such that opposite flanks of the trapezoidal thread come into contact with flanks of a correspondi...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SUZUKI TERUAKI, NISHI MASATSUGU
Format:	Patent
Sprache:	eng
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 threaded joint with trapezoidal threads for oil well pipes superior in sealing performance: having a load flank angle theta1 of each thread satisfying desired conditions; having a shape of the thread such that opposite flanks of the trapezoidal thread come into contact with flanks of a corresponding thread simultaneously when the joint is so fastened as to give a threaded portion of the joint an interference DELTAd of not smaller than 0.12% and not larger than 0.8% of the outer diameter of a pipe to be jointed; having a gap formed between a crest and a bottom of this trapezoidal thread and set to be not larger than 0.2 mm; and having dimensional tolerances of thread width and thread height of the threads satisfying desired conditions.