# US 2026/0084792 A1 · Rov-operated tool for drilling and extraction of sheared bolts in subsea equipment

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- Number: US 2026/0084792 A1
- Document ID: US20260084792A1
- Status: Published application
- Kind: A1
- Application number: 19/334,181
- Filed: 2025-09-19
- Published: 2026-03-26
- Earliest claimed: 2024-09-26
- Assignees: Petroleo Brasileiro S.A. - Petrobras
- Applicants: PetróLeo Brasileiro S.A. - Petrobras
- Inventors: PEDRO PAULO BEZERRA DA CUNHA CASTRO; DOUGLAS OLIVEIRA CORREA DE SOUZA; ANDRE LUIZ BEVILAQUA SANTANA
- Web page: https://patentgrep.com/patent/US20260084792A1

## CPC

- B63G 8/001: {Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations (self-propelled or direction controlled diving chambers with mechanical link to a base B63C11/42)}
- B25B 27/18: withdrawing broken threaded parts or twist drills
- B63C 11/52: Tools specially adapted for working underwater, not otherwise provided for
- B63G 2008/005: {remotely controlled}
- B63G: OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS (means of attack or defence in general, e.g. turrets F41H)
- B25B: TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
- B63C: LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS (floating nets, floating slipways, or the like for recovering aircraft from the water B63B35/52)

## Abstract

Systems and methods for drilling and extracting sheared bolts in subsea equipment. The ROV-operated tool may comprise: a subsea screwdriver comprising a fixing base, one or more hydraulic drive engines, handles for handling by ROV and a drill holder; and a reaction holder comprising a support body, a worm bolt, a reaction arm, a hydraulic engine for driving the spindle attached to the worm bolt, a fixing bracket for hydraulic hoses for driving the engines and a fixing bracket on the subsea screwdriver.

## Claims

### Claim 1

A remotely operated vehicle (ROV)-operated tool for drilling and extracting one or more sheared bolts, comprising:
a subsea screwdriver comprising:
a fixing base;
one or more hydraulic drive engines;
ROV handling handles;
a drill holder, and
a reaction holder comprising:
a support body;
a worm bolt;
a reaction arm;
a hydraulic engine for driving a spindle connected to the worm bolt;
a fixing bracket for hydraulic hoses for driving the engines; and
a fixing bracket on the subsea screwdriver.

### Claim 2 (depends on 1)

The ROV-operated tool of claim 1, wherein the worm bolt is driven by the spindle drive hydraulic engine of the reaction holder.

### Claim 3 (depends on 1)

The ROV-operated tool of claim 1, wherein the drill holder of the subsea screwdriver has a hexagonal shape at a top.

### Claim 4 (depends on 1)

The ROV-operated tool of claim 1, wherein the reaction holder is removable and allows for replacing the drill holder with a tip containing an extractor.

### Claim 5 (depends on 4)

The ROV-operated tool of claim 4, wherein the extractor has a thread in the opposite direction to the one or more sheared bolts.

### Claim 6 (depends on 1)

The ROV-operated tool of claim 1, wherein the reaction holder is guided by two rods that make up the support body.

### Claim 7 (depends on 1)

The ROV-operated tool of claim 1, wherein the reaction arm moves along the worm bolt during a drilling operation.

### Claim 8 (depends on 1)

The ROV-operated tool of claim 1, wherein the hydraulic hoses of the one or more hydraulic drive engines of the subsea screwdriver and the reaction holder are fixed to the fixing bracket for hydraulic hoses for driving the engines.