Drill bit extension for sidewall corer

摘要

This invention relates to an apparatus for cutting cores from the sidewall of a borehole after the borehole has been drilled. The apparatus includes an elongated housing which supports guide means which provides a path along which a core bit and motor can be moved to extend and retract the core bit. The guide means has a rotational control section and a transverse control section. The rotation control section guides the motor and its core bit from an upright position in the housing to a selected angle and the vertical transverse control section guides the coring bit means in the direction of the formation.