Method and apparatus for guiding and sealing a drill string

Details Method and apparatus for guiding and sealing a drill string Method and apparatus for guiding and sealing a drill string

E - Fixed Constructions

21

B

255/28, 255/89

E21B 21/015 (2006.01) E21B 19/14 (2006.01) E21B 19/16 (2006.01) E21B 19/24 (2006.01)

Patent

CA 1035347

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