APPARATUS AND METHOD FOR ENGAGING A TUBULAR

摘要

An embodiment of the present invention comprises an apparatus for engaging with an outside diameter of a tubular comprises a device body having an internal surface that defines an internal diameter in a first position and allowing t he tubular to pass therethrough and an actuator operable to move the internal surface of t he device body from the first position to a second position, the second position defining an internal diameter less than the first position internal diameter. The internal surfac e of the device body is sized with a predetermined grip length for engaging with the outside diameter of the tubular, The grip length is determined by a function of the outside diameter of the tubular and the coefficient of friction between of the outside diameter of t he tubular and the interior surface of the device body and the device body is operable to engage with a tubular having a predetermined range of outside diameters.