Patent ID: 6827147
Filing Date: 2004-12-07
Classification: E21B

Abstract:
A reciprocating lubricator for inserting a downhole tool into a wellbore closed by a pressure containment spool, the lubricator comprising:a lubricator tube for accommodating the downhole tool; a lubricator base adapted to be mounted in a fluid-tight seal to a top of the pressure containment spool, the lubricator base including an axial passage sealingly receiving the lubricator tube, which can be reciprocated therethrough; a lubricator head having an axial passage, the lubricator head being sealingly connected to a top end of the lubricator tube and providing a base for supporting equipment mounted thereto; and a pair of hydraulic cylinders connected to opposite sides of the lubricator base and the lubricator head for reciprocating the lubricator tube and the lubricator head between a first position in which a bottom end of the lubricator tube is positioned above a wellbore closure mechanism of the pressure containment spool, and a second position in which the lubricator tube extends downwards through the pressure containment spool.