SLIM TYPE OIL WELL PIPE FITTING

摘要

A threaded joint for oil well pipes is provided which can guarantee a joint efficiency sufficient for practical use in deep wells, which has a decreased joint outer diameter, and which has an improved bending resistance, compression resistance, and over-torque resistance which are sufficient for use by the side track technique. It is an integral threaded joint for oil well pipes in which it has a joint efficiency of at least 70%, the outer diameter of the joint is larger than and at most 1.08 times the outer diameter of the oil well pipe bodies, and the threaded portions have a cross section of a trapezoidal shape with a load flank angle ( alpha ) of the threads in the range of 0 to -20 degrees and a stabbing flank angle (&thetas;) thereof in the range of 35 to 50 degrees. <IMAGE>