Method and apparatus for locating a drill bit when drilling...

Details Method and apparatus for locating a drill bit when drilling... Method and apparatus for locating a drill bit when drilling...

E - Fixed Constructions

21

B

E21B 47/09 (2012.01) E21B 17/14 (2006.01) E21B 17/16 (2006.01) E21B 21/10 (2006.01) E21B 29/00 (2006.01)

Patent

CA 2239645

A method for locating a drill bit when drilling out cementing equipment from a casing of a wellbore. A first step involves placing in the casing of the wellbore at the time of placing cementing equipment, at least one coloured marker member. A second step involves monitoring cuttings during drilling for traces of colour. Penetration of a drill bit into the cementing equipment is indicated by coloured cuttings from the at least one coloured marker member.

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