# US 10,370,921 B2 · Tubular cutting tool

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- Number: US 10,370,921 B2
- Document ID: US10370921B2
- Status: Granted
- Kind: B2
- Application number: 15/136,540
- Filed: 2016-04-22
- Published: 2016-10-27
- Granted: 2019-08-06
- Earliest claimed: 2015-04-24
- Assignees: Weatherford Technology Holdings, LLC
- Applicants: Weatherford Technology Holdings, LLC
- Inventors: James R. Miller; Dan Hugh Blankenship; Jeremy Lee Stone; David W. Teale
- Web page: https://patentgrep.com/patent/US10370921B2

## CPC

- E21B 29/005: {with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method of cutting a tubular includes providing a rotatable cutting tool in the tubular, the cutting tool having a blade with a cutting structure thereon; extending the blade relative to the cutting tool; rotating the cutting tool relative to the tubular; guiding the cutting structure into contact with the tubular; cutting the tubular using the blade; and limiting extension of the blade. A rotatable blade for cutting a tubular includes a blade body extendable from a retracted position; a cutting structure disposed on a leading edge of the blade body, the cutting structure configured to cut the tubular; a stop on a first surface of the blade body; and an initial engagement point on a second surface of the blade body, the initial engagement point configured to guide the cutting structure into contact with the tubular.

## Claims

### Claim 1

A rotatable blade for cutting a tubular, comprising;
a blade body extendable between a retracted position and an extended position, the blade body haying a protrusion;
a cutting structure disposed on a leading edge of the protrusion the cutting structure configured to cut the tubular;
a stop, wherein the stop is configured to engage the tubular; and
an initial engagement point disposed on the protrusion, the initial engagement point configured to guide the cutting structure into contact with the tubular.

### Claim 2 (depends on 1)

The blade of claim 1, wherein the initial engagement point is disposed on an outward-facing surface of the protrusion.

### Claim 3 (depends on 1)

The blade of claim 1, wherein the stop comprises a low-friction material.

### Claim 4 (depends on 1)

The blade of claim 1, wherein the initial engagement point comprises a wearable member.

### Claim 5 (depends on 4)

The blade of claim 4, wherein the wearable member is configured to partially wear away prior to the cutting structure contacting the tubular.

### Claim 6 (depends on 1)

The blade of claim 1, wherein the stop is configured to limit at least one of:
an extension of the blade body, and
a depth of cut of the cutting structure.

### Claim 7 (depends on 1)

The blade of claim 1, wherein the blade is rotatable about a pivot point.

### Claim 8 (depends on 1)

The blade of claim 1, further comprising a pivot pin, wherein the blade is rotatable about the pivot pin.

### Claim 9 (depends on 1)

The blade of claim 1, wherein the stop is disposed at an angle relative to a top surface of the cutting structure.

### Claim 10 (depends on 1)

The blade of claim 1, wherein a length of the cutting structure at least as long as a thickness of the tubular.

### Claim 11 (depends on 1)

The blade of claim 1, wherein the protrusion is disposed on an attachment.

### Claim 12 (depends on 11)

The blade of claim 11, wherein the attachment is at least one of:
integrally formed with the blade body,
operably coupled to the blade body, and
replaceable.

### Claim 13

A rotatable blade for cutting a tubular, comprising;
a blade body pivotable from a retracted position;
a cutting structure disposed on a leading edge of the blade body, the cutting structure configured to cut the tubular;
a stop on a first surface of the blade body, wherein the stop is configured to engage the tubular; and
an initial engagement point on a second surface of the blade body, the initial engagement point configured to guide the cutting structure into contact with the tubular;
a pivot pin disposed in an aperture of the blade body, wherein the blade is pivotable about the pivot pin.

### Claim 14 (depends on 13)

The blade of claim 13, wherein at least one of the first surface and the second surface is an outward-facing surface.

### Claim 15 (depends on 13)

The blade of claim 13, wherein the stop comprises a low-friction material.

### Claim 16 (depends on 13)

The blade of claim 13, wherein the initial engagement point comprises a wearable member.

### Claim 17 (depends on 13)

The blade of claim 13, wherein the stop is configured to limit at least one of:
an extension of the blade body, and
a depth of cut of the cutting structure.

### Claim 18 (depends on 13)

The blade of claim 13, wherein the stop is disposed at an angle relative to a top surface of the cutting structure.

### Claim 19 (depends on 13)

The blade of claim 13, wherein a length of the cutting structure at least as long as a thickness of the tubular.

### Claim 20 (depends on 13)

The blade of claim 13, wherein the cutting structure, the stop, and the initial engagement point are disposed on an attachment.

### Claim 21 (depends on 20)

The blade of claim 20, wherein the attachment is at least one of:
integrally formed with the blade body,
operably coupled to the blade body, and
replaceable.

### Claim 22

A rotatable blade for cutting a tubular, comprising;
a blade body extendable from a retracted position;
a cutting structure disposed on a leading edge of the blade body, the cutting structure configured to cut the tubular;
a stop on a first surface of the blade body, wherein the stop is configured to engage the tubular;
an initial engagement point on a second surface of the blade body, the initial engagement point configured to guide the cutting structure into contact with the tubular; and
wherein the first surface of the blade body is the same as the second surface of the blade body.

### Claim 23 (depends on 22)

The blade of claim 22, wherein the stop comprises a low-friction material.

### Claim 24 (depends on 22)

The blade of claim 22, wherein the initial engagement point comprises a wearable member.

### Claim 25 (depends on 22)

The blade of claim 22, wherein the stop is configured to limit at least one of:
an extension of the blade body, and
a depth of cut of the cutting structure.

### Claim 26 (depends on 22)

The blade of claim 22, wherein the blade is rotatable about a pivot point.

### Claim 27 (depends on 22)

The blade of claim 22, further comprising a pivot pin, wherein the blade is rotatable about the pivot pin.

### Claim 28 (depends on 22)

The blade of claim 22, wherein the stop is disposed at an angle relative to a top surface of the cutting structure.

### Claim 29 (depends on 22)

The blade of claim 22, wherein a length of the cutting structure at least as long as a thickness of the tubular.

### Claim 30 (depends on 22)

The blade of claim 22, wherein the cutting structure, the stop, and the initial engagement point are disposed on an attachment.

### Claim 31 (depends on 30)

The blade of claim 30, wherein the attachment is at least one of:
integrally formed with the blade body,
operably coupled to the blade body, and
replaceable.