Inventors:
Erez N. Allouche - Ruston LA, US
David Hall - Ruston LA, US
Michael Swanbom - Dubach LA, US
Slade Richard - Ruston LA, US
International Classification:
E21B 7/08, E21B 7/06, E21B 4/16
Abstract:
A steerable ground piercing tool includes an elongated outer housing having a lengthwise extending bore and an inner assembly at least in part disposed within the outer housing. The inner assembly includes a rotatable chisel having a longitudinally extending shaft at least in part disposed within the housing bore. The chisel has a first end defining an asymmetric tip and a second end defining a first impact surface for receiving a reciprocating action impact to drive the tool through the ground. The inner assembly further includes a conversion mechanism to selectively convert upon activation thereof at least a first portion of the reciprocating action imparted to the first impact surface into combined reciprocation and rotation of the tool.