High pressure well mandrel

Claim 1

In a mandrel for use in a well tubing in which the mandrel body has an open bore for alignment with the well tubing and includes a valve pocket housing having an internal tubular valve pocket and in which the outer surface of the valve pocket housing remote from the bore is positioned to form a portion of the body exterior and the outer surface of the valve housing nearest to the bore axis defines a portion of the circumference of the bore wherein the improvement comprises, the bore being substantially circular in cross section and the valve pocket housing being welded to the mandrel body by axially extending seams laterally offset from the axis of the bore of the body towards the valve pocket a distance no greater than the radius of the bore, the mass of the material in the valve pocket housing about the valve pocket being sufficient to prevent warping of the valve pocket when the housing is welded to the body, said valve pocket housing being externally shaped to conform to the external shape of the body, and the portion of the valve pocket housing adjacent the bore extending substantially around the circumference of the bore to where the housing is joined to the wall of the body, said valve pocket housing including a valve latching clamp integrally formed therewith prior to welding the housing to the body, and said housing and the body including axially extending mating surfaces for aligning the housing and body for welding.