Apparatus and method for hanging tubulars in wells

摘要

A hanger for use in joining tubulars includes an inner tubular with a first portion of length with increasing wall thickness and a second portion of length with decreasing wall thickness through the same longitudinal direction. A swedge sized to expand the inner tubular beyond the yield point to engage and expand the outer tubular is to be drawn through the inner tubular. With the variation in wall thickness, the outer tubular is progressively expanded in an increasing manner and then in a decreasing manner. The difference in inelastic expansion operates to insure an appropriate ultimate fit at one or two areas between the overlapping tubulars. The inner tubular may include a nipple affixed to a liner or may include a liner with an outer filler. In one case, the nipple has varying wall thickness while in the other the filler exhibits the varying wall thickness. A segmented swedge includes portions of the part lines between adjacent segments which are circumferential. Shear elements extend across the circumferential sections to hold the swedge together.