A single-blade underreamer for forming a cavity within a well bore includes a housing rotatably disposed within the well bore, and a stabilizer coupled to the housing. The stabilizer is operable to stabilize the housing within the well bore during formation of the cavity. The underreamer also includes...http://www.google.es/patents/US6595301?utm_source=gb-gplus-sharePatente US6595301 - Single-blade underreamer
