A self-decentralized hydra-jet tool for jet treating the face of a formation penetrated by a well bore which tool includes a jet treating head assembly adapted to be lowered into a well bore and supported therein by a flexible conduit assembly communicating between the jet treating head assembly and...http://www.google.es/patents/US3958641?utm_source=gb-gplus-sharePatente US3958641 - Self-decentralized hydra-jet tool
