US 2014/0209326 A1 · METHODS AND APPARATUS RELATING TO EXPANSION TOOLS FOR TUBULAR STRINGS

Abstract

An expansion tool for use in a wellbore includes an expansion surface made up of a concave portion, a convex portion and a straight section therebetween. The straight section is formed according to a formula Y=(1.26)(X)−0.13, where X is the wall thickness of a tubular and Y is the length of the straight section. The concave portion and the convex portion have an arc length extending the concave portion to a trailing edge of the tool. The concave and convex portions are radius-shaped. The arrangement of the shapes and their relation to each other reduces relatively high and low contact pressures and lessens the effects of axial bending in a tubular or a connection.

Claims10

Dependent claims

An expansion tool for expanding a tubular in a wellbore comprising:

a leading end having a first outer diameter smaller than an inside diameter of the tubular to be expanded;
an expansion surface including:
a concave portion extending from the leading end;
a center section extending from the concave portion and;
a curvilinear convex portion extending from the center section and including a portion of the tool having the largest outer diameter.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/227,720Filed 27 Mar 2014

Priority

15 Mar 2010

Published

31 Jul 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

E21B 43/105
Of expandable casings, screens, liners, or the like: expanding tools specially adapted therefor
E21B 17/042
Between rod or the like and bit or between rod and rod or the like: threaded
E21B 43/103
Setting of casings, screens, liners or the like in wells: of expandable casings, screens, liners, or the like
E21B 43/106
Of expandable casings, screens, liners, or the like: couplings or joints therefor

Methods and apparatus relating to expansion tools for tubular strings

Life of this patent

Methods and apparatus relating to expansion tools for tubular strings

Life of this patent

Abstract

Claims10