Casing drill bit facilitating drill-out thereof, and related methods of manufacture and use

Patent metadata

Field	Value
Publication number	US-12595704-B2
Application number	US-202418672284-A
Country	US
Kind code	B2
Filing date	May 23, 2024
Priority date	May 26, 2023
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

An earth boring system includes a drill-out bit disposed at a distal end of a drill string. The drill-out bit includes blades. The system also includes a casing drill bit that has a drill bit body with a bottom profile. The bottom profile at least partially matches a profile of the blades of the drill-out bit. The drill-out bit is operable to drill through the casing drill bit.

First claim

What is claimed is:

1 . An earth boring system comprising:
a drill-out bit disposed at a distal end of a drill string, the drill-out bit comprising blades; and a casing drill bit comprising a drill bit body having a bottom profile and a plurality of casing drill bit blades, the bottom profile at least partially matching a profile of the blades of the drill-out bit, angular distances between circumferentially neighboring blades of the plurality of casing drill bit blades at a radial distance from a central axis of the casing drill bit all being unequal to one another, each of the blades having a different swept profile from one another, and the drill-out bit being operable to drill through the casing drill bit.

2 . The earth boring system of claim 1 , wherein the casing drill bit blades have a height that is constant along at least a portion of the casing drill bit blades.

3 . The earth boring system of claim 2 , wherein the casing drill bit blades comprise a spiral or swept profile.

4 . The earth boring system of claim 1 , wherein the casing drill bit further comprises fluid passageways extending through the bottom of the casing drill bit body, the fluid passageways being disposed nonsymmetrically about the bottom of the casing drill bit body.

5 . The earth boring system of claim 1 , wherein the bottom profile of the casing drill bit matches between 20% and 80% of the profile of the blades of the drill-out bit.

6 . The earth boring system of claim 1 , wherein the bottom profile of the casing drill bit is configured such that the blades of the drill-out bit initially drill completely through the casing drill bit at a rotational axis of the casing drill bit.

7 . A casing drill bit comprising:
a casing drill bit body; and blades extending from the casing drill bit body, each blade comprising cutting elements, first angular distances between the cutting elements on circumferentially neighboring blades of the blades all being unequal to one another at a first radial distance from a rotational axis of the casing drill bit, and each of the blades having a different swept profile from one another.

8 . The casing drill bit of claim 7 , wherein the blades comprise a spiral or swept profile.

9 . The casing drill bit of claim 7 , wherein the casing drill bit body comprises a bottom having a bottom profile, the bottom profile matching a profile of drill-out blades of a drill-out bit operable to drill through the casing drill bit.

10 . The casing drill bit of claim 9 , wherein the blades of the casing drill bit comprise a height that is constant along at least a portion of the blades of the casing drill bit.

11 . The casing drill bit of claim 7 , further comprising fluid passageways extending through a bottom of the casing drill bit body, the fluid passageways being disposed nonsymmetrically about the bottom of the casing drill bit body.

12 . The casing drill bit of claim 7 , wherein second angular distances between the cutting elements on the circumferentially neighboring blades are unequal to one another at a second radial distance from the rotational axis of the casing drill bit.

13 . The casing drill bit of claim 12 , wherein the first angular distances are unequal to the second angular distances.

14 . An earth boring system comprising:
a drill-out bit disposed at a distal end of a drill string, the drill-out bit comprising drill-out blades; and a casing drill bit comprising casing drill bit blades, wherein first angular distances between neighboring casing drill bit blades of the casing drill bit blades at a first radius are not equal to second angular distances between the neighboring casing drill bit blades at a second radius, the second radius being larger than the first radius, each of the blades having a different swept profile from one another, and the drill-out bit being configured to drill through the casing drill bit.

15 . The earth boring system of claim 14 wherein the casing drill bit comprises a drill bit body having a bottom profile matching a profile of drill-out blades of the drill-out bit.

16 . The earth boring system of claim 15 , wherein the casing drill bit blades extend from a bottom of the casing drill bit body, the casing drill bit blades having a height that is constant along at least a portion of the casing drill bit blades.

17 . The earth boring system of claim 14 , wherein the casing drill bit blades comprise a spiral or swept profile.

18 . The earth boring system of claim 14 , wherein the casing drill bit further comprises fluid passageways extending through a bottom of the casing drill bit, the fluid passageways being disposed nonsymmetrically about the bottom of the casing drill bit.

Assignees

• Baker Hughes Oilfield Operations Llc

Inventors

• Bilen Juan Miguel
• Adams Nathaniel R
• Maldonado Melody Alicia
• Fankhauser Eric Roberto
• Rojas Nicole

Classifications

• E21B10/003

  with cutting edges facing in opposite axial directions · CPC title

• E21B10/43 Primary

  characterised by the arrangement of teeth or other cutting elements · CPC title

• E21B7/20 Primary

  Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes · CPC title