# US 4,398,598 A · Break-out tool for annular type blow-out preventers

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- Number: US 4,398,598 A
- Document ID: US4398598A
- Status: Granted
- Kind: A
- Application number: 06/264,641
- Filed: 1981-05-18
- Granted: 1983-08-16
- Earliest claimed: 1981-05-18
- Inventors: Joe H. Fabrygel
- Web page: https://patentgrep.com/patent/US4398598A

## CPC

- E21B 33/06: Blow-out preventers {, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers (rotating blow-out preventers E21B33/085)}
- E21B 19/16: Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence)
- Y10T 29/53687: by rotation of work part
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Apparatus for removing the frozen head of an annular type blow-out preventer, wherein an annular frame is mounted over the threadedly attached head leaving a central, top portion of the blow-out preventer head exposed to receive a torque arm adapted to be secured to the preventer head, torque being applied to the torque arm from hydraulic power assemblies mounted on the frame for breaking the threaded connection between said preventer head and body.

## Claims

### Claim 1

An apparatus for removing the head of an annular type blow-out preventer comprising;
(a) a frame adapted to be mounted over the head of an annular type blow-out preventer, such preventer head being threadedly attached to the body of the annular type blow-out preventer, said frame having a central opening which is adapted to leave a central, top portion of said blow-out preventer head exposed;
(b) mount means for mounting said frame on to said annular type blow-out preventer body, said mount means including a plurality of depending mounting flanges which extend into connection with lugs on said preventer body;
(c) a torque arm adapted to be secured to the preventer head for movement with said preventer head; and
(d) torque applying means mounted with said frame and extending into engagement with said torque arm for applying torque to said torque arm, which transmits said torque to said preventer head attached thereto for breaking the threaded connection between said preventer head and body.

### Claim 2 (depends on 1)

The structure set forth in claim 1, including:
said frame being generally annular in configuration.

### Claim 3 (depends on 1)

The structure set forth in claim 1, wherein said torque applying means includes:
oppositely positioned power means mounted on said frame and extending into contact with said torque arm for applying opposite forces to the ends of said torque arm for applying a torque thereto.

### Claim 4 (depends on 3)

The structure set forth in claim 3, wherein each of said power means includes:
a hydraulic cylinder assembly attached to said frame and including a piston rod extending into engagement with said torque arm.

### Claim 5 (depends on 4)

The structure set forth in claim 4, wherein:
pivotal connection means pivotally connecting said hydraulic cylinder assemblies to said frame.

### Claim 6 (depends on 4, 5)

The structure set forth in claim 4 or 5, including:
said piston rods terminating in outer end portions having U-shaped sections for engaging said torque arm.

### Claim 7 (depends on 1, 4)

The structure set forth in claim 1 or 4, wherein:
said torque arm having outer end portions terminating approximately adjacent to said frame and having concave segments for receiving said piston rods.

### Claim 8 (depends on 1)

The structure set forth in claim 1, wherein:
said torque arm having a U-shaped notch for securing to the preventer head while a pipe section is emplaced in the preventer head.