| CPC E21B 10/322 (2013.01) [E21B 7/046 (2013.01); E21B 47/02 (2013.01)] | 19 Claims |
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1. A drilling assembly, comprising:
a drill string comprising a drill bit configured to drill a wellbore, the drill string forming, with the drill string disposed within the wellbore, an annulus defined between an outer wall of the drill string and the wall of the wellbore;
one or more sensors configured to be coupled to the drill string, the one or more sensors configured to detect at least one parameter of the drill string or of the wellbore;
a reamer assembly configured to be coupled to the drill string uphole of the drill bit, the reamer assembly comprising:
a housing defining a cavity arranged to receive fluid from the drill string,
at least one movable reamer pad configured to be at least partially disposed within the cavity, and
a valve configured to be coupled to the housing, the valve operable to regulate, as a function of feedback from the one or more sensors, a flow of fluid into the cavity, allowing the fluid to enter the cavity underneath the reamer and contact the at least one movable reamer, allowing the fluid to fill a volume of the cavity and push the at least one movable reamer pad out of the cavity from a first position, in which the at least one reamer pad is retracted and the reamer assembly defines a first reaming diameter, to a second position in which the at least one reamer pad is expanded and the reamer assembly defines a second reaming diameter greater than the first reaming diameter;
wherein the drilling assembly further comprises a second valve configured to regulate a fluid pressure in the cavity by regulating a flow of fluid out of the fluid cavity and into the annulus.
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