Patent ID: 6371205
Filing Date: 2002-04-16
Classification: E21B

Abstract:
A grouting assembly axially movable in a drill string having a bit end to a position adjacent to the bit end to seat on a drill string landing shoulder, comprising an axially elongated tubular body for containing grouting material, said tubular body having a landing shoulder seatable on the drill string landing shoulder, an inner peripheral wall, an axial outer end and an axial inner end, a nozzle mounted to the tubular body inner end, a head mounted to the outer end of the tubular body and having a fluid passage opening to the outer end of the tubular body, an axial elongated piston mounted in the tubular body for axial movement from an outer position adjacent to the head to an axial inner position adjacent to the nozzle, said piston including an axial outer end portion, an intermediate portion, an outer peripheral wall, a transverse inner end, an inner transverse bore opening through the piston outer peripheral wall and an axial bore opening to the transverse bore and through the piston inner end to the nozzle when the piston is in the inner position of the piston, and sleeve means axially movable relative to the piston and in the tubular body between an axial outer position forming a fluid seal between the piston and the tubular body inner peripheral wall and blocking the transverse bore when the piston is in its outer position and an inner position permitting fluid flow through the transverse port when the piston is in its inner position.