Bidirectional stabilizer with impact arrestors and blades with wrap angles

摘要

A bidirectional stabilizer, which reduces impact damage while rotating into and out of a wellbore. The bidirectional stabilizer can be coupled on a first end to a drill string and on a second end to a drill bit. 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. The plurality of blades can have a wrap angle for forming a particle flow path between pairs of the plurality of blades configured with a line of sight parallel to the longitudinal axis.

主权项

1. A bidirectional stabilizer for use in a wellbore comprising:
a) a shaft centered around a longitudinal axis; b) an annulus formed longitudinally through the shaft, wherein the annulus is configured for maximum wellbore fluid flow; and c) a cutting portion extending from the shaft, the cutting portion comprising:
i) a first cutting portion extending at a first cutting angle to a first apex from a first shaft end;ii) a second cutting portion extending at a second cutting angle to a second apex from a second shaft end, the second cutting portion forming a slightly larger outer diameter as the second cutting portion extends away from the second shaft end, wherein the first cutting portion and the second cutting portion are installed at the first cutting angle and the second cutting angle ranging from 20 degrees to 55 degrees from the longitudinal axis of the bidirectional stabilizer;iii) a plurality of helical blades integrally connected between the first cutting portion and the second cutting portion, each helical blade having an identical length, each helical blade comprising a smooth blade surface with a wrap angle forming a particle flow path between pairs of helical blades without intersecting more than thirty percent of any one helical blade and configured with a line of sight parallel to the longitudinal axis;iv) an outer radius of the cutting portion greater than or equal to ¼ of an inch of a blade depth as measured from a flute trough to reduce hang-up in a wellbore;v) an inner radius of the cutting portion greater than or equal to ⅛ of an inch of the blade depth as measured from the flute trough to reduce stress on a bottom hole assembly of a drill string to which the bidirectional stabilizer is secured;vi) a plurality of flutes formed between pairs of the plurality of helical blades, the plurality of flutes configured with a first bypass area greater than or equal to thirty-five percent of a bit diameter for bits having an outer diameter of 10 and ⅝ inches or greater or a second bypass area greater than or equal to twenty five percent of a bit diameter for bits having an outer diameter less than 10 and ⅝ inches;vii) a plurality of cutting nodes installed on at least a portion of at least one edge of the first cutting portion, on at least a portion of at least one edge of the second cutting portion, or on at least a portion of at least one edge of the first cutting portion and the second cutting portion; andviii) a plurality of impact arrestors mounted in a location either directly adjacent each cutting node on the first cutting portion, directly adjacent each cutting node on the second cutting portion, or in both locations; andwherein the bidirectional stabilizer couples on an end portion to the drill string and on a nose portion to the bottom hole assembly simultaneously, with the bidirectional stabilizer having a symmetrical configuration.