Improvements in or relating to top drives

Details Improvements in or relating to top drives Improvements in or relating to top drives

E - Fixed Constructions

21

B

E21B 3/02 (2006.01) E21B 44/00 (2006.01)

Patent

CA 2678832

A top drive (10) for use in wellbore operations above a well, which top drive comprises: a main body, a main shaft (16) extending from the main body, said main shaft (16) comprising a flow bore through which drilling fluid is flowable in use, a main shaft housing (17) enclosing a portion of the main shaft (16), the main shaft having a non-loaded position relative to the main shaft housing, and sensing apparatus (24) located for sensing bending of the main shaft (16) away from the non-loaded position.

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