Threaded joint with low tightening torque

摘要

A threaded tubular connection includes a first body terminated by an external abutment, and linked to a male threading prolonged by a terminal portion forming an internal abutment surface at its axial end, such that the connection includes a second body defining a bearing surface for the external abutment at one free end, and including an initial portion on its internal surface connecting the bearing surface to a female threading, made up onto the male threading, and terminating in an internal shoulder facing the internal abutment, such that the linking profile between one of the following: the external abutment, the internal abutment, the bearing surface, and/or the internal shoulder, has a profile with a variable diameter in cross section, over a length of the body which is less than the terminal portion or initial portion.

主权项

1. A threaded tubular connection comprising:
a first tubular component made up onto a second tubular component, the tubular components being intended for exploration or working a hydrocarbon well, or to form a landing string; the first tubular component comprising a first substantially cylindrical body with an axis of revolution terminated by an external abutment, the external abutment being linked to an external circumference of the first body via a fourth profile with an external diameter which increases from the external abutment towards the first body, and linked to a male threaded connection portion extended by a terminal non-threaded portion forming an internal abutment surface at its axial end, such that the internal abutment is linked to an internal circumference of the first body via a first profile with an internal diameter decreasing from the internal abutment towards the inside of the first body; the second tubular component comprising a second substantially cylindrical body defining a bearing surface at one free end for the external abutment, the bearing surface being linked to an external circumference of the second body via a third profile with an external diameter which increases from the bearing surface towards the second body, the second body comprising an initial non-threaded portion on its internal surface linking the bearing surface to a female threaded connection portion which can be made up onto the male threaded connection portion, and terminating in an internal shoulder facing the internal abutment, the internal shoulder being linked to the internal circumference of the second body via a second profile with an internal diameter which decreases from the internal shoulder towards inside of the second body; wherein at least one of the first profile or the second profile is convex or concave; and a length of at least one of the first profile and the second profile along an axis of revolution is more than 1.5875 mm and less than a length of the terminal portion; a length of at least one of the third profile and the fourth profile along the axis of revolution is more than 1.5875 mm and less than a length of the initial portion.