A device useful for conducting lateral or transverse excavating operations within a wellbore comprising a rotating drill bit with jet nozzles on a flexible arm. The arm can retract within the housing of the device during deployment within the wellbore, and can be extended from within the housing in order...http://www.google.es/patents/US7584794?utm_source=gb-gplus-sharePatente US7584794 - Mechanical and fluid jet horizontal drilling method and apparatus
Mechanical and fluid jet horizontal drilling method and apparatus
