# US 11,111,729 B2 · Multi-indenter hammer drill bits and method of fabricating

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- Number: US 11,111,729 B2
- Document ID: US11111729B2
- Status: Granted
- Kind: B2
- Application number: 16/463,982
- Filed: 2017-11-29
- Published: 2020-03-12
- Granted: 2021-09-07
- Earliest claimed: 2016-11-29
- Assignees: Mincon International Limited
- Applicants: Mincon International Limited
- Inventors: John Kosovich
- Web page: https://patentgrep.com/patent/US11111729B2

## CPC

- E21B 10/56: Button-type inserts (E21B10/52 takes precedence)
- E21B 10/36: Percussion drill bits ({with helical conveying portion E21B10/445;} characterised by wear resisting parts E21B10/46)
- E21B 10/00: Drill bits (specially adapted for deflecting the direction of boring {E21B7/064}; with means for collecting substances E21B27/00)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A multi-indenter drill bit includes a plurality of indenters arranged on a drilling surface of a bit face. The ratio of the total indenter area to the bit face area is defined by a parameter KPI1 (expressed as a percentage), and the ratio of the average individual indenter area to the bit face area is defined by a parameter KPI2, (expressed as a percentage). The relationship between KPI1 and KPI2 is defined by an equation.

## Claims

### Claim 1

A method of fabricating a down-the-hole hammer multi-indenter drill bit for use in down-the-hole hammer drilling of a hole, the drill bit including a plurality of indenters arranged on a drilling surface of a bit face, the method comprising:
defining a drill bit face area;
defining a number of drill bit indenters;
defining a total area of the drill bit indenters,
wherein a ratio, expressed as a percentage, of total indenter area to bit face area provides a value KPI1 (Key Performance Indicator 1), and a ratio, expressed as a percentage, defined by (the total area the drill bit indenters/the number of indenters)/(bit face area), provides a value KPI2 (Key Performance Indicator 2); and
using the equation
KPI2<=1.353×10−6(KPI1)5−1.527×10−4(KPI1)4+6.586×10−3(KPI1)3−1.301×10−1(KPI1)2+1.185(KPI1)−3.960
to constrain a relationship between KPI1 and KPI2.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising defining the bit face area/the total number of indenters by a parameter KPI3, wherein a value of KPI3 is between 90 sq. mm/indenter and 5,000 sq. mm/indenter.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 90 sq. mm/indenter and 250 sq. mm/indenter.

### Claim 4 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 120 sq. mm/indenter and 500 sq. mm/indenter.

### Claim 5 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 130 sq. mm/indenter and 1,100 sq. mm/indenter.

### Claim 6 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 140 sq. mm/indenter and 1,400 sq. mm/indenter.

### Claim 7 (depends on 2)

The method according to claim 2, KPI3 wherein the value of KPI3 is between 160 sq. mm/indenter and 1,700 sq. mm/indenter.

### Claim 8 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 180 sq. mm/indenter and 2,000 sq. mm/indenter.

### Claim 9 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 200 sq. mm/indenter and 2,300 sq. mm/indenter.

### Claim 10 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 250 sq. mm/indenter and 2,600 sq. mm/indenter.

### Claim 11 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 300 sq. mm/indenter and 2,900 sq. mm/indenter.

### Claim 12 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 400 sq. mm/indenter and 3,400 sq. mm/indenter.

### Claim 13 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 800 sq. mm/indenter and 4,000 sq. mm/indenter.

### Claim 14 (depends on 2)

The method according to claim 2, wherein the value of KPI3 is between 1,000 sq. mm/indenter and 5,000 sq. mm/indenter.

### Claim 15 (depends on 1)

The method according to claim 1, comprising using the drill bit in a hydraulic down-the-hole hammer.