# US 2016/0356101 A1 · Anti-friction device of drilling elements

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- Number: US 2016/0356101 A1
- Document ID: US20160356101A1
- Status: Published application
- Kind: A1
- Application number: 15/025,795
- Filed: 2014-09-12
- Published: 2016-12-08
- Earliest claimed: 2013-09-30
- Assignees: Drillmec S.P.A.
- Applicants: Drillmec SPA
- Inventors: Angelo CALDERONI
- Web page: https://patentgrep.com/patent/US20160356101A1

## CPC

- E21B 17/1085: {Wear protectors; Blast joints; Hard facing}
- E21B 17/1064: {Pipes or rods with a relatively rotating sleeve}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

An anti-friction device is associated with a drilling element, the drilling element having a substantially cylindrical shape, with a first outside diameter (d1) and a longitudinal extension along a first axis (X). The drilling element includes at least one housing for receiving the anti-friction device. The anti-friction device has a hollow cylindrical shape having an inside diameter (d) which is smaller than the first diameter (d1) of the drilling element and an outside diameter (D) which is greater than the first diameter (d1) of the drilling element. The anti-friction device is adapted to rotate about the first axis (X) in the housing, independently of the drilling element.

## Claims

### Claim 1

An anti-friction device associated with a drilling element; said drilling element having a substantially cylindrical shape, with a first outside diameter (d1) and a longitudinal extension along a first axis; said drilling element comprising:
at least one housing for receiving said anti-friction device;
said anti-friction device having a hollow cylindrical shape, having an inside diameter which is smaller than said first diameter of the drilling element and an outside diameter which is greater than said first diameter of the drilling element;
said anti-friction device being capable of rotating about said first axis in said housing, independently of the drilling element.

### Claim 2 (depends on 1)

A device according to claim 1, wherein:
said housing has an inner profile;
said anti-friction device has a hollow cylindrical shape and comprises:
an inner surface positioned proximate said inner profile;
an outer surface for abutting, when in use, on walls of an open hole of a drilling well or on walls of casings.

### Claim 3 (depends on 2)

A device according to claim 2, wherein said inner surface has a curved profile for reducing friction against the inner profile of the housing.

### Claim 4 (depends on 1)

A device according to claim 1, wherein said antifriction device is a ring.

### Claim 5 (depends on 1)

A device according to claim 1, wherein said device comprises at least one opening portion for allowing said device to be assembled to or disassembled from the drilling element.

### Claim 6 (depends on 5)

A device according to claim 5, wherein said opening portion is a groove extending along a total longitudinal extension of the device; said device comprising at least one interface portion comprising gripping elements for increasing equivalent diameters of said anti-friction device.

### Claim 7 (depends on 5)

A device according to claim 5, comprising two opening portions comprising a first portion and a second portion of said anti-friction device.

### Claim 8 (depends on 1)

A device according to claim 1, wherein said device is made of steel or carbon fibre.

### Claim 9 (depends on 1)

A device according to claim 1, wherein said housing comprises a ceramic or graphite treated housing.

### Claim 10 (depends on 1)

A device according to claim 1, wherein said drilling element is a drill pipe.

### Claim 11 (depends on 1)

A device according to claim 1, wherein said drilling element is a tool joint or a sub.

### Claim 12 (depends on 1)

A device according to claim 1, wherein at least two anti-friction devices are associated with each drilling element.