07357197 is referenced by 25 patents and cites 107 patents.

A method and apparatus for signalling the surface operator about downhole conditions. Sensors located downhole collect data while drilling and the data is processed to determine bit failure, for example. When the sensor data indicates a failure, the pressure of drilling mud is varied using a valve on the downhole unit, and this pressure variance is indicated by a pressure gauge visible to the operator. This pressure change tells the operator a failure has been indicated.

Title
Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface
Application Number
10/36105
Publication Number
7357197 (B2)
Application Date
October 17, 2001
Publication Date
April 15, 2008
Inventor
Andrew J Osborne Jr
Dallas
TX, US
Orlando De Jesus
Stillwater
OK, US
Roger L Schultz
Aubrey
TX, US
Agent
Robert O Groover III
Assignee
Halliburton Energy Services
TX, US
IPC
E21B 44/00
E21B 47/00
View Original Source