Patent ID: 9410379
Filing Date: 2016-08-09
CPC Classification: E21B

Claim Text:
1. A tool for reaming a borehole, the tool comprising: a tubular body having a central axis, a first end, and a second end opposite the first end; an uphole eccentric reamer section mounted to the tubular body, wherein the uphole eccentric reamer section is eccentric about the central axis of the tubular body; a downhole eccentric reamer section mounted to the tubular body and axially positioned below the uphole eccentric reamer section, wherein the downhole eccentric reamer section is eccentric about the central axis of the tubular body; wherein each eccentric reamer section includes a first blade extending radially from the tubular body, wherein the first blade of each eccentric reamer section has an uphole end and a downhole end axially positioned below of the uphole end, wherein the first blade of the uphole eccentric reamer section circumferentially overlaps with the first blade of the downhole eccentric reamer section; wherein the first blade of the uphole eccentric reamer section extends helically about the tubular body in a first helical direction moving from the uphole end of the first blade of the uphole eccentric reamer section to the downhole end of the first blade of the uphole eccentric reamer section: wherein the first blade of the downhole eccentric reamer section extends helically about the tubular body in a second helical direction moving from the uphole end of the first blade of the downhole eccentric reamer section to the downhole end of the first blade of the downhole eccentric reamer section; wherein the second helical direction is opposite the first helical direction; and a cutter element mounted to the first blade of each eccentric reamer section; wherein the cutter element mounted to the first blade of the uphole reamer section and the cutter element mounted to the first blade of the downhole reamer section are each configured to engage and ream the borehole.