# US 2014/0190386 A1 · Offshore drilling vessel

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- Number: US 2014/0190386 A1
- Document ID: US20140190386A1
- Status: Published application
- Kind: A1
- Application number: 14/203,066
- Filed: 2014-03-10
- Published: 2014-07-10
- Earliest claimed: 2008-02-15
- Assignees: Itrec B.V.
- Applicants: Itrec B.V.
- Inventors: Diederick Bernardus WIJNING; Joop ROODENBURG
- Web page: https://patentgrep.com/patent/US20140190386A1

## CPC

- E21B 15/02: specially adapted for underwater drilling (E21B15/04 takes precedence)
- B63B 21/507: {with mooring turrets}
- B63B 27/04: of derricks {, i.e. employing ships' masts}
- B63B 35/44: Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices {(construction methods for floating offshore platforms B63B75/00)}
- B63B 35/4413: {Floating drilling platforms, e.g. carrying water-oil separating devices}
- E21B 19/002: {specially adapted for underwater drilling (E21B19/09, E21B19/143 take precedence)}
- E21B 19/004: {supporting a riser from a drilling or production platform}
- E21B 19/006: {including heave compensators}
- E21B 19/02: Rod or cable suspensions
- E21B 19/09: specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
- E21B 19/143: {specially adapted for underwater drilling}
- E21B 19/155: {Handling between horizontal and vertical position}
- E21B 19/16: Connecting or disconnecting pipe couplings or joints (E21B19/20 takes precedence)
- B63B 2003/147: {Moon-pools, e.g. for offshore drilling vessels}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- B63B: SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING (arrangements of vessel ventilation, heating, cooling, or air-conditioning B63J2/00; floating substructures as supports of dredgers or soil-shifting machines E02F9/06)

## Abstract

A drilling vessel or drilling platform comprising: a hull with a moonpool; and a hydraulic riser tensioner system configured to apply a tension force from the drilling vessel or drilling platform upon a riser string, the riser tensioner system comprising: a riser ring, wherein the riser tensioner system is fastened to the riser string via the riser ring; a set of sheaves provided at each lateral side of the moonpool; a plurality of cables configured to extend between the drilling vessel or drilling platform to the riser ring via the sheaves; and a set of hydraulic cylinders actuating upon the sheaves and thereby applying the tension force to the cables, wherein the hydraulic cylinders are arranged substantially horizontally at the lateral sides of the moonpool.

## Claims

### Claim 1

A drilling vessel or drilling platform comprising:
a hull with a moonpool; and
a hydraulic riser tensioner system configured to apply a tension force from the drilling vessel or drilling platform upon a riser string, the hydraulic riser tensioner system comprising:
a riser ring, wherein the hydraulic riser tensioner system is fastened to the riser string via the riser ring;
a set of sheaves provided at each lateral side of the moonpool;
a plurality of cables configured to extend between the drilling vessel or drilling platform to the riser ring via the sheaves; and
a set of hydraulic cylinders actuating upon the sheaves and thereby applying the tension force to the cables, wherein the hydraulic cylinders are arranged substantially horizontally at the lateral sides of the moonpool.

### Claim 2 (depends on 1)

The drilling vessel or drilling platform according to claim 1, wherein the hull has a main deck, and the hydraulic cylinders are arranged above the main deck.

### Claim 3 (depends on 1)

The drilling vessel or drilling platform according to claim 1, further comprising:
a firing line hoist system configured to be used for drilling or drilling related operations, wherein the firing line hoist system is mounted on the hull at the moonpool, wherein the firing line hoist system comprises:
a mast connected to the hull of the drilling vessel; and
a hoisting device supported by the mast and having a load attachment device displaceable along a firing line, which extends on the outside of and adjacent to the first side of the mast.

### Claim 4 (depends on 1)

The drilling vessel or drilling platform according to claim 1, further comprising:
a monohull with a bow and a stern;
an accommodation topside having crew quarters and a bridge, the accommodation topside being arranged on the hull at the bow;
a main deck between the accommodation topside and the stern, wherein a front main deck portion of the main deck extends forward of the moonpool and a rear main deck portion of the main deck extends rearward of the moonpool; and
a multiple firing line hoist system mounted on the hull above the moonpool, the multiple firing line hoist system comprising a mast having a base that extends between sections of the hull on port and starboard side of the moonpool, the base being spaced from a bow side and from a stern side of the moonpool, thereby forming a front moonpool area forward of the mast and a rear moonpool area rearward of the mast,
wherein the hydraulic riser tensioner system is arranged at the front moonpool area.

### Claim 5 (depends on 2)

The drilling vessel according to claim 2, further comprising:
a monohull with a bow and a stern;
an accommodation topside having crew quarters and a bridge, the accommodation topside being arranged on the hull at the bow, wherein the main deck is located between the accommodation topside and the stern, and a front main deck portion of the main deck extends forward of the moonpool and a rear main deck portion of the main deck extends rearward of the moonpool; and
a multiple firing line hoist system mounted on the hull above the moonpool, the multiple firing line hoist system comprising a mast having a base that extends between sections of the hull on port and starboard side of the moonpool, the base being spaced from a bow side and from a stern side of the moonpool, thereby forming a front moonpool area forward of the mast and a rear moonpool area rearward of the mast,
wherein the hydraulic riser tensioner system is arranged at the front moonpool area.