Cold Forming and Heat Treatment Process for Tubulars

摘要

A method for forming an elongated tubular member for use with hydrocarbon production includes forming a blank member of a steel material having an outer diameter equal to a first outer diameter. The blank member is mounted on a rotating mandrel. A tubular member is formed by engaging a rotary disk with an outer surface of the blank member and moving the rotary disk in a first axial direction, lengthening the blank member in a second axial direction and reducing the outer diameter of the blank member until the outer diameter of a central portion of the blank member is equal to a second outer diameter and the outer diameter of end portions of the blank member is equal to a third outer diameter. The tubular member is heat treated to reduce a residual stress. A mechanical connection is formed in each of the end portions.

主权项

1. A method for forming an elongated tubular member for use with hydrocarbon drilling and production, the method comprising the steps of:
(a) forming a blank member, the blank member being formed of a steel material and having an inner diameter equal to a final inner diameter and an outer diameter equal to a first outer diameter; (b) mounting the blank member on a rotating mandrel; (c) forming a tubular member by engaging a rotary disk with an outer surface of the blank member and moving the rotary disk in a first axial direction along the outer surface, lengthening the blank member in a second axial direction and reducing the outer diameter of the blank member by permanently deforming the blank member with the rotary disk, until the outer diameter of a central portion of the blank member is equal to a second outer diameter and the outer diameter of end portions of the blank member is equal to a third outer diameter, the third outer diameter being greater than the second outer diameter, and the first outer diameter being greater than both the second outer diameter and the third outer diameter, the rotating mandrel maintaining the inner diameter at the final inner diameter; (d) heat treating the tubular member to reduce a residual stress of the tubular member; and (e) forming a mechanical connection in each of the end portions.