HYDRAULIC PISTON-EFFECT METHOD AND APPARATUS FOR FORMING A BORE HOLE

摘要

Apparatus for forming a bore hole in an underground formation including a guide pipe with a fluid seal and a tube sealed with the seal and terminating in a drillhead with at least one fluid exit port. The tube moves out the exit end of the guide pipe into the formation under hydraulic pressure applied against the drillhead. Preferably, the bottom of the guide tube includes a whipstock to turn the drillhead, from a vertical to a horizontal direction, to form a radial.