A well casing to be installed in the ground is resonantly driven at a sonic frequency by means of an orbiting mass oscillator. A wedging probe member is optionally attached to the end of the casing and is driven by the vibratory energy to facilitate the penetration of the earthen material ahead of the...http://www.google.ca/patents/US4548281?utm_source=gb-gplus-sharePatent US4548281 - Apparatus and method for installing well casings in the ground employing resonant sonic energy in conjunction with hydraulic pulsating jet action
