Bidirectional stabilizer

摘要

A bidirectional stabilizer and a drill string wherein the bidirectional stabilizer reduces motion while rotating into and out of a wellbore. The bidirectional stabilizer can be coupled on a first shaft end to the drill string and on a second shaft end to a bottom hole assembly or other downhole equipment. The bidirectional stabilizer can have an annulus configured for maximum wellbore fluid flow. A cutting portion can be formed on a shaft with a plurality of blades between the first shaft end and the second shaft end. The plurality of blades of the cutting portion can be on a first plane and a plurality of cutting nodes can be on a second plane for smoothing a wellbore.

主权项

1. A bidirectional stabilizer for stabilizing a drill string while reaming into and out of a wellbore, the bidirectional stabilizer comprising:
a. a shaft connected between a first shaft end and a second shaft end, wherein the shaft comprises an outer diameter; b. the first shaft end and the second shaft end centered around a longitudinal axis; c. an annulus formed longitudinally through the shaft, wherein the annulus is configured for maximum wellbore fluid flow; d. a cutting portion formed on an outer surface of the shaft, the cutting portion comprising:
(i) a first cutting segment extending at a first angle from the first shaft end, the first angle ranging from 10 degrees to 30 degrees from the longitudinal axis forming a slightly larger outer diameter for the first cutting segment as the first cutting segment extends away from the first shaft end;(ii) a second cutting segment extending at a second angle from the second shaft end, the second angle ranging from 10 degrees to 30 degrees from the longitudinal axis forming a slightly larger outer diameter for the second cutting segment as the second cutting segment extends away from the second shaft end;(iii) a plurality of blades longitudinally connected between the first cutting segment and the second cutting segment, each blade of the plurality of blades can have an identical length, each blade of the plurality of blades existing in a plane parallel to the longitudinal axis, wherein the first cutting segment has a cutting segment length from 5 percent to 35 percent of the length of the plurality of blades, the second cutting segment has a cutting segment length from 5 percent to 35 percent of the length of the plurality of blades, each blade of the plurality of blades comprising a smooth blade surface;(iv) a plurality of flutes formed between pairs of blades of the plurality of blades, wherein the depth of each flute of the plurality of flutes is from 10 percent to 50 percent of the outer diameter; and(v) a plurality of cutting nodes installed on at least one edge of the first cutting segment and on at least one edge of the second cutting segment; andwherein an end portion and a nose portion range in length from 25 percent to 35 percent of a total length of the bidirectional stabilizer, and the bidirectional stabilizer couples on the end portion to the drill string and on the nose portion to a bottom hole assembly and the bidirectional stabilizer has a symmetrical configuration.