Patent ID: 9657532
Date: 2017-05-23
CPC Classifications: E21B

Claim:
1. A well tool, comprising: an inner and outer tubings nested to move relative to one another and defining a shear juncture therebetween where a surface of the inner tubing is adjacent a surface of the outer tubing; a shear member spanning the shear juncture, the shear member having a first portion with a different cross-sectional area than a second portion; and a cam surface associated with the inner tubing or the outer tubing that abuts the shear member and moves the shear member as the inner and outer tubings move relative to one another and changes the shear member between having the first portion aligned with the shear juncture to having the second portion aligned with the shear juncture, wherein the cam surface extends in a circumferential direction to move the shear member radially when the inner and outer tubings are rotated relative to one another.