Patent ID: 9587437
Date: 2017-03-07
CPC Classifications: E21B

Claim:
1. A powered reamer comprising: a stationary assembly having a flow bore there through; a rotating assembly at least partially surrounding the stationary assembly; one or more cutting structures coupled to an outer surface of the rotating assembly; a flow restriction disposed within the flow bore so as to divert a portion of fluid flowing through the flow bore through an outlet from the flow bore into an annulus between the stationary assembly and the rotating assembly; and a power section formed in the annulus between the stationary assembly and the rotating assembly, wherein the power section operates to eccentrically rotate the rotating assembly around the stationary assembly in response to fluid flowing through the annulus between the stationary assembly and the rotating assembly, wherein the power section further comprises: a helical lobe formed on an outer surface of the stationary assembly; and a helical groove formed in a resilient sleeve coupled to an inner surface of the rotating.