Importance

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Abstract

This invention provides an oil well pipe threaded joint capable of preventing looping and squeezing of a soft synthetic resin ring and consequently, preventing catching of a tool during a logging operation and damage such as corrosion by a corrosive fluid, the oil well pipe threaded joint employs the construction wherein a soft synthetic resin ring is interposed between distal end surfaces of pins, each step surface of a shoulder portion on an inner peripheral side of a coupling and a step surface of each pin are brought into abuttment, and each inside thread of the coupling of the coupling and each outside thread of each pin are engaged, wherein a compressive ratio of the soft synthetic resin ring in an axial direction falls within the range expressed by an inequality 18,000/E.ltoreq.compressive ratio (%)<0.038.sup.-1.times.1n[1-{(d.sub.1 -d.sub.2)+0.36}/0.25t.sub.1 ] (where d.sub.1 : inside diameter of pin, d.sub.2 : inside diameter of soft synthetic resin ring, t.sub.1 : thickness of distal end of pin).

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First Claim