| 摘要 |
Embodiments of a reciprocating tool, used to engage and clear obstructions in a wellbore, have a biasing spring located externally about an axially reciprocating and rotatable sleeve to act between the rotatable sleeve and the non-rotatable mandrel to bias the rotatable sleeve to an extended position. During a drill out operation, a non-rotatable sleeve, connected to the mandrel for telescoping over the mandrel and the rotatable sleeve during a downstroke of the mandrel, guides a drill string for drill-out of at least the mandrel and other internal components. Positioning the biasing spring external to the rotating sleeve and downhole of the non-rotating sleeve prevents engaging the spring with the drill string. The rotating sleeve provides an internal guide for the drill out string to further avoid engagement with the spring. |
| 主权项 |
1. A wellbore obstruction-clearing tool, fit to a downhole distal end of a tubing string for advancing the tubing string through obstructions in a wellbore, the tubing string having an axial tubular bore therethrough, the tool comprising:
a tubular, rotatable sleeve for engaging the obstructions, the rotatable sleeve having an axial sleeve bore extending axially therethrough and a disruptor connected to a distal end thereof; a tubular mandrel adapted for connection to the distal end of the tubing string, the mandrel having an axial mandrel bore extending therethrough for fluid connection to the axial bore of the tubing string, the mandrel fit concentrically within the sleeve bore for axial reciprocation therein between an upstroke and a downstroke; a helical drive arrangement acting between the mandrel and the sleeve for driving the rotatable sleeve axially and rotationally along the mandrel during the downstroke and the upstroke of the mandrel between a retracted position and an extended position respectively; a non-rotatable sleeve fit concentrically about the mandrel and attached thereto at an uphole end, the non-rotatable sleeve, the non-rotatable sleeve being located about the helical drive arrangement and fit telescopically about at least a portion of the rotatable sleeve during reciprocation of the mandrel; and a spring fit concentrically about an external surface of the rotatable sleeve and operatively connected between a distal end of the non-rotatable sleeve and the distal end of the rotatable sleeve, wherein the distal end of the non-rotatable sleeve for energizing the spring in the retracted position, the non-rotatable sleeve telescoping axially over at least a portion of the rotatable sleeve and the biasing spring; and in the upstroke, the energized spring biases the rotatable sleeve to the extended position, resetting the helical drive. |
