Production tubing threaded joint

摘要

This invention provides an oil well pipe threaded joint capable of preventing lopping 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 $(where\; d1:\; inside\; diameter\; of\; pin,\; d2:\; inside\; diameter\; of\; soft\; synthetic\; resin\; ring,\; t1:\; thickness\; of\; distal\; end\; of\; pin).\mathop{\mathrm{image}}$