Coring tools for managing hydraulic properties of drilling fluid and related methods

Patent metadata

Field	Value
Publication number	US-2016258223-A1
Application number	US-201514640656-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Mar 6, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

A coring bit for use on a coring tool for extracting a sample of subterranean formation from a well bore includes a bit body having a cavity, wherein a throat portion of the cavity extends into the bit body from a face of the bit body. The coring bit includes a sleeve disposed within the cavity of the bit body, the sleeve configured to separate a face discharge channel and a throat discharge channel. The face discharge channel is located radially outward of the sleeve and the throat discharge channel is located radially inward of the sleeve. A method of repairing a such a coring includes removing the sleeve from the cavity of a bit body.

First claim

What is claimed is:

1 . A coring bit for use on a coring tool for extracting a sample of subterranean formation from a well bore, comprising:
a bit body having a cavity, wherein a throat portion of the cavity extends into the bit body from a face of the bit body; and a sleeve disposed within the cavity of the bit body, the sleeve configured to separate at least one face discharge channel and a throat discharge channel, the at least one face discharge channel located radially outward of the sleeve, the throat discharge channel located radially inward of the sleeve.

2 . The coring bit of claim 1 , further comprising a coring shoe disposed in the cavity of the bit body.

3 . The coring bit of claim 1 , wherein the sleeve comprises two or more parts.

4 . The coring bit of claim 1 , wherein the sleeve defines at least one recess in a radially inner surface of the sleeve, the at least one recess providing the throat discharge channel with zones of higher and lower flow resistance.

5 . The coring bit of claim 1 , wherein the throat discharge channel comprises a first region and a second region, wherein the second region has a total flow area higher than a total flow area of the first region.

6 . The coring bit of claim 1 , further comprising one or more guide blocks affixed to an inner surface of the bit body within the cavity, the one or more guide blocks configured to guide the sleeve into place during insertion of the sleeve into the cavity of the bit body or to support the sleeve during operation of the coring bit.

7 . The coring bit of claim 1 , wherein the sleeve defines one or more fluid passages extending through the sleeve.

8 . The coring bit of claim 1 , wherein at least a portion of a length of the at least one face discharge channel has non-circular cross-sectional shape.

9 . The coring bit of claim 8 , wherein the portion of the length of the at least one face discharge channel having a non-circular cross-sectional shape comprises about 40% or more of the length of the at least one face discharge channel.

10 . The coring bit of claim 8 , wherein a total circumferential dimension of the portion of the at least one face discharge channel subtends an angle of at least about 72 degrees about a longitudinal axis of the bit body in a plane transverse to the longitudinal axis of the bit body 10 .

11 . The coring bit of claim 10 , wherein a total circumferential dimension of the portion of the at least one face discharge channel subtends an angle of at least about 108 degrees about a longitudinal axis of the bit body in a plane transverse to the longitudinal axis of the bit body 10 .

12 . The coring bit of claim 11 , wherein a total circumferential dimension of the portion of the at least one face discharge channel subtends an angle of at least about 144 degrees about a longitudinal axis of the bit body in a plane transverse to the longitudinal axis of the bit body 10 .

13 . A method of repairing a coring tool for extracting a sample of subterranean formation from a well bore, the method comprising:
removing a sleeve from a cavity of a bit body of the coring tool, the sleeve configured to separate at least one face discharge channel and a throat discharge channel during operation of the coring tool, the at least one face discharge channel located radially outward of the sleeve, the throat discharge channel located radially inward of the sleeve.

14 . The method of claim 13 , further comprising:
repairing a radially outer surface of the at least one face discharge channel after removing the sleeve; and installing a replacement sleeve into the cavity of the bit body, wherein the replacement sleeve is one of the removed sleeve, a repaired sleeve, and a new sleeve.

15 . The method of claim 14 , wherein repairing the radially outer surface of the at least one face discharge channel comprises forming at least a portion of the at least one face discharge channel by one or more of a cutting, milling, turning, grinding, eroding, polishing, additive manufacturing, 3D printing, and casting process.

16 . The method of claim 14 , wherein the sleeve comprises two or more parts.

17 . The method of claim 14 , further comprising installing at least one guide block in the cavity of the bit body prior to installing the replacement sleeve into the cavity of the bit body.

18 . The method of claim 14 , further comprising selecting the replacement sleeve according to one or more of a downhole subterranean earth formation, drilling fluid composition, and a drilling fluid flow rate expected during operation of the coring tool.

19 . The method of claim 13 , wherein a total circumferential dimension of the at least one face discharge channel subtends an angle of at least about 108 degrees about a longitudinal axis of the bit body in a plane transverse to the longitudinal axis of the bit body 10 .

20 . The method of claim 13 , further comprising:
forming an additional face discharge channel in an inner surface in the bit body after removing the sleeve by one or more of a cutting, milling, turning, grinding, eroding, polishing, additive manufacturing, 3D printing, and casting process; and installing a replacement sleeve into the cavity of the bit body, wherein the replacement sleeve is one of a repaired sleeve and a new sleeve.

Assignees

• Baker Hughes Inc

Inventors

• Uhlenberg Thomas
• Fulda Christian

Classifications

• E21B10/48

  the bit being of core type · CPC title

• E21B10/02

  Core bits (characterised by wear resisting parts E21B10/48) · CPC title

• E21B10/605 Primary

  the bit being a core-bit · CPC title