Low stress traction system

摘要

A technique enables anchoring of a tool in a wellbore. The technique provides traction against a well component without creating high stress concentrations that weaken the well component. An anchoring device comprises anchoring members that are selectively movable to an expanded configuration for anchoring the tool. The anchoring members have traction surfaces able to selectively engage a smooth anchoring surface of the well component at any desired location along the well component. Each traction surface is formed to facilitate traction while minimizing stress concentration.

主权项

1. A system for supporting a large traction force in a tubular member disposed in a wellbore, comprising:
an anchoring device comprising a structure, a plurality of movable members mounted for radial movement with respect to the structure, and a traction pad mounted to each movable member, the traction pad comprising: a base portion; and a plurality of traction features protruding from the base portion, the plurality of traction features having smooth curvilinear shapes with a predetermined curvature selected to provide smooth indentations in the tubular member upon actuation of the anchoring device.