Wellbore circulation assembly

Details Wellbore circulation assembly Wellbore circulation assembly

E - Fixed Constructions

21

B

E21B 34/16 (2006.01) E21B 34/02 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2711083

In some embodiments, a circulation assembly can direct all or substantially all fluid downstream in a drill string in a first mode of operation, and some or all fluid to an annulus in a second mode. Operation of the circulation assembly can be repeatedly changed between the modes of operation. In some embodiments, the circulation assembly can comprise other modes wherein fluid is apportioned between the annulus and the downstream drill string.

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