HAMMER DRILL

摘要

A downhole apparatus connected to a workstring within a wellbore. The workstring is connected to a bit member. The apparatus includes a mandrel operatively connected to a downhole motor mechanism, an anvil member operatively formed on the bit member, the anvil member being operatively connected to the mandrel, a radial bearing housing unit operatively connected to the workstring, with the radial bearing housing unit being disposed about the mandrel, and a hammer member slidably attached to the radial bearing housing unit.

主权项

1. An apparatus for generating an axial impact, comprising:
a hammer segment having a radial cam surface; an anvil segment having an internal radial shoulder, an inner wall extending from the internal radial shoulder, and one or more partial cavities adjacent to the internal radial shoulder in an internal space within the inner wall of the anvil segment; one or more rolling elements partially disposed within the partial cavities of the anvil segment, wherein the rolling elements cooperate with the radial cam surface of the hammer segment for axially displacing the hammer segment from the anvil segment and generating the axial impact upon rotation of the hammer segment or the anvil segment, wherein each rolling element moves 360 degrees relative to the hammer segment.