# US 12,110,759 B2 · Equipment for self-abandonment of wells

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- Number: US 12,110,759 B2
- Document ID: US12110759B2
- Status: Granted
- Kind: B2
- Application number: 18/077,554
- Filed: 2022-12-08
- Published: 2023-06-15
- Granted: 2024-10-08
- Earliest claimed: 2021-12-09
- Assignees: Petroleo Brasileiro S.A. - Petrobras
- Applicants: Petróleo Brasileiro S.A.—Petrobras
- Inventors: Luis Carlos Marques Pires; Danilo Colombo
- Web page: https://patentgrep.com/patent/US12110759B2

## CPC

- E21B 33/1208: {characterised by the construction of the sealing or packing means (E21B33/1277 takes precedence)}
- E21B 33/13: Methods or devices for cementing, for plugging holes, crevices or the like
- E21B 29/02: by explosives or by thermal or chemical means {(freeing stuck objects by explosives E21B31/002)}
- E21B 47/12: Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Equipment for autonomous abandonment of wells is installed its position during the completion of the well. Such equipment melts the string, cables and accessories and the casing by means of an exothermic reaction (which may have thermite among its reagents). The start of this reaction is remotely triggered according to the interest of the well operator. As a product of the process, there is the formation of a permanent barrier (BIS) to abandon the well. This permanent barrier will be a product of the residual material from the heat release reaction, a molten material from the string and casing, as well as the material responsible for the formation of the BIS, which shall have eutectic characteristics, that is, after its solidification it shall have an expansion in order to ensure that it generates rock-to-rock adhesion.

## Claims

### Claim 1

Equipment for self-abandonment of a well, comprising;
an internal casing having a wall of a same diameter and technical specification as a production string or injection string;
data and power cables;
a permanent barrier casing case;
a reaction initiator along an outer surface of the wall of the internal casing;
an energetic material case encircling the internal casing and coupled to the reaction initiator; and
an energetic material housed within the energetic material case.

### Claim 2 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the data and power cables are installed internally or externally to the equipment.

### Claim 3 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the reaction initiator is a chemical reaction, electric spark, or other heat source.

### Claim 4 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the energetic material is thermite.

### Claim 5 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the permanent barrier casing case comprises an aluminum alloy.

### Claim 6 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the permanent barrier casing case comprises a bismuth alloy.

### Claim 7 (depends on 1)

The equipment for self-abandonment of a well according to claim 1, wherein the equipment is installed within the well during completion of the well.