# US 8,146,688 B2 · Drill bit with prefabricated cuttings splitter and method of making

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- Number: US 8,146,688 B2
- Document ID: US8146688B2
- Status: Granted
- Kind: B2
- Application number: 12/427,980
- Filed: 2009-04-22
- Published: 2010-10-28
- Granted: 2012-04-03
- Earliest claimed: 2009-04-22
- Assignees: Baker Hughes Incorporated
- Inventors: Timothy K. Marvel; Michael R. Wells
- Web page: https://patentgrep.com/patent/US8146688B2

## CPC

- E21B 10/55: with preformed cutting elements
- E21B 10/43: characterised by the arrangement of teeth or other cutting elements
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A downhole drill bit includes, a body, a plurality of cutters attached to the body, and at least one prefabricated splitter having a proximal portion and at least one distal portion. The proximal portion is encased within the body and the at least one distal portion extends outwardly of the body. Further the at least one distal portion is in operable communication with at least one of the plurality of cutters such that the at least one distal portion bifurcates cuttings cut by the at least one cutter.

## Claims

### Claim 1

A downhole drill bit comprising:
a body;
a plurality of cutters attached to the body; and
at least one prefabricated splitter having a proximal portion encased within the body and at least one distal portion extending outwardly of the body, the proximal portion having a larger dimension positioned deeper within the body than a dimension nearer to a surface of the body to mechanically lock the at least one prefabricated splitter into the body, the at least one distal portion being in operable communication with at least one of the plurality of cutters such that the at least one distal portion bifurcates cuttings cut by the at least one cutter.

### Claim 2 (depends on 1)

The downhole drill bit of claim 1, wherein the proximal portion has a noncircular cross-sectional shape.

### Claim 3 (depends on 1)

The downhole drill bit of claim 1, wherein the proximal portion is bonded to the body.

### Claim 4 (depends on 1)

The downhole drill bit of claim 1, wherein a material of the at least one prefabricated splitter is different than a material of the body.

### Claim 5 (depends on 1)

The downhole drill bit of claim 1, wherein the at least one prefabricated splitter is made of a material selected from the group consisting of polycrystalline diamond compact (PDC), thermally stable polycrystalline diamond (TSP), cubic boron nitride (CBN), polycrystalline cubic boron nitride (PCBN), carbon, ceramics and combinations of the aforementioned.

### Claim 6 (depends on 1)

The downhole drill bit of claim 1, wherein the at least one prefabricated splitter includes a splitter edge configured to be a first portion of the at least one prefabricated splitter to engage cuttings.

### Claim 7 (depends on 6)

The downhole drill bit of claim 6, wherein the splitter edge is oriented substantially perpendicular to a face of the at least one of the plurality of cutters with which the at least one splitter having the splitter edge is in operable communication.

### Claim 8 (depends on 6)

The downhole drill bit of claim 6, wherein the splitter edge is slanted such that a distal portion of the splitter edge is nearer the cutter than a proximal portion of the splitter edge.

### Claim 9 (depends on 6)

The downhole drill bit of claim 6, wherein the splitter edge is downstream of a cutter edge on a face of the at least one of the plurality of cutters that the at least one splitter having the splitter edge is in operable communication with, downstream being defined by a flow of the cuttings relative to the cutter edge.

### Claim 10 (depends on 6)

The downhole drill bit of claim 6, wherein at least two surfaces of the at least one splitter intersect at the splitter edge.

### Claim 11 (depends on 10)

The downhole drill bit of claim 10, wherein at least one of the at least two surfaces includes one from the group consisting of polytetrafluoroethylene (PTFE) treating, chrome plating, hardfacing, physical vapor deposition/chemical vapor deposition coatings, diamond-like coatings and combinations of two or more of the foregoing.