Drilling Apparatus for Reducing Borehole Oscillation

摘要

A downhole drilling apparatus includes a drill bit, a steering tool, and an anti-oscillation sleeve deployed about a downhole end of the steering tool. The anti-oscillation sleeve is undergauge and is deployed axially between a first touch point at which the drill bit contacts the borehole wall and a second touch point at which the steering tool contacts the borehole wall.

主权项

1. A downhole drilling apparatus comprising:
a drill bit, the drill bit including a first touch point configured to contact a borehole wall; a steering tool including a steering tool body, a downhole end of the steering tool body being connected with the drill bit, the steering tool including a second touch point configured to contact the borehole wall; and an anti-oscillation sleeve deployed about the downhole end of the steering tool body, the anti-oscillation sleeve being located axially between the first touch point and the second touch point, the anti-oscillation sleeve having an outer diameter less than that of the drill bit at the first touch point and the steering tool at the second touch point.