BALANCED THREAD FORM, TUBULARS EMPLOYING THE SAME, AND METHODS RELATING THERETO

摘要

A tubular member having a longitudinal axis, a first end, and a second end is disclosed. The tubular member includes a pin connector including an external shoulder, an internal shoulder axially spaced from the external shoulder, and a plurality of threads in a region between the external shoulder and the internal shoulder that taper relative to the longitudinal axis at 1.0 to 1.5 inches per foot. The threads include an axial density measured in a number of threads per inch (TPI), and when the pin connector is threadably engaged with a box connector, each of the threads contacts a corresponding box thread on the box connector along a projected radial distance HC. In addition, the threads are configured such that the product of 2(√{square root over (3)})(HC)(TPI) is greater than or equal to 0.95 and less than or equal to 1.05.

主权项

1. A threaded pin connector disposable at one end of a tubular member and having a longitudinal axis, wherein the threaded connector includes:
a pin external shoulder configured to engage a box external shoulder on a mating threaded box connector when the pin connector is threadably engaged with the box connector; a pin internal shoulder axially spaced from the pin external shoulder, wherein the pin internal shoulder is configured to engage with a box internal shoulder on the box connector when the pin connector is threadably engaged with the box connector; and a plurality of threads in a region between the pin external shoulder and the pin internal shoulder that taper relative to the longitudinal axis at 1.0 to 1.5 inches per foot,
wherein each of the plurality of the threads includes:a crest;a root disposed radially inward from the crest;a stab flank extending between the crest and the root; anda load flank extending between the crest and the root, wherein the stab flank is more proximate the pin internal shoulder than the load flank;wherein the plurality of the threads has a bearing strength that represents a measure of the force required to plastically deform the load flank; andwherein the plurality of the threads has a shear strength that represents a measure of the axial force required to shear the thread between the load flank and the stab flank; andwherein the plurality of the threads is configured such that the bearing strength is within +/−5% of the shear strength.