An apparatus and accompanying method for monitoring and reporting downhole bit failure. Individual sensors are placed on a sub which is separate from the drill bit itself, and are powered by a vibration driven power system. The sensor readings are used to compute values which represent the ratios of...http://www.google.es/patents/US20020148644?utm_source=gb-gplus-sharePatente US20020148644 - Differential sensor measurement method and apparatus to detect a drill bit failure and signal surface operator
Differential sensor measurement method and apparatus to detect a drill bit ...
Número de solicitud: 10/040,304 Número de publicación: US 2002/0148644 A1 Fecha de presentación: 26 Oct 2001 Patente emitida: US6648082 ( Fecha de emisión 18 Nov 2003)
