Patent ID: 6763753
Filing Date: 2004-07-20
Classification: E21B,Y10T

Abstract:
An apparatus for retrieving a wireline tool stuck in a well bore, comprising:a tubular work string; an attachment device mounted adjacent a lower end of said work string, said attachment device being adapted for attaching said work string to a downhole tool suspended in a well bore on a wireline; a wireline passageway along said work string and, through said attachment device; a blade mounted adjacent !said lower end of said work string above said attachment device, said blade having a cutting edge; and a hydraulic actuator mounted adjacent said blade, said hydraulic actuator being adapted to drive said cutting edge of said blade substantially transversely through said wireline passageway above said attachment device; wherein said hydraulic actuator comprises: a piston adapted for longitudinal movement relative to said work string in response to hydraulic differential pressure; and a wedge adapted to be driven longitudinally relative to said work string by said piston; wherein said blade is adapted to be driven transversely relative to said wireline passageway by said longitudinal movement of said wedge.