Patent ID: 8651182
Filing Date: 2014-02-18
Classification: E21B

Abstract:
1. A latch tool for engaging a profile in a surrounding tubular in at least one subterranean location, comprising: an elongated housing having a longitudinal axis and a plurality of openings through which dogs are selectively actuated to engage the profile in the tubular located outside said openings; at least some of said dogs have an axial extension that moves within said housing and does not extend into said window and is disposed internally of said elongated housing at a location axially displaced from said windows, said extension further comprising a first gripping profile that faces a surrounding inwardly facing surface of said housing for selective contact therewith; said housing having a second gripping profile on said inwardly facing surface adjacent and opposed to said first gripping profile such that extension of said dogs through their respective windows brings said gripping profiles into interlocking engagement for transmission of axial stress, said stress created from differential pressure on the latch tool from within the surrounding tubular that otherwise would transfer to said housing at said openings and instead direct said stress to said inwardly facing surface on said housing.