Page 46: of Maritime Reporter Magazine (January 1984)

Rowan Gorilla I (continued from page 42) 507-feet-tall legs and 160-feet-tall drilling derrick, a Gorilla rig com- prises approximately 16,000 tons of steel. Its triangular hull is 297 feet long, 292 feet wide, and 30 feet deep. The rig's large size pro- vides nearly one acre of deck space for storage of consumables used during drilling. This ample stor- age capacity along with certain design features make the rig com- patable with hostile offshore areas where it can continue to drill even if the flow of supplies from shore were interrupted.

Classed +A1 by the American

Bureau of Shipping and built in accordance with Mobile Offshore

Drilling Unit Regulations estab- lished by the U.S. Coast Guard,

Canadian Coast Guard, U.K. De- partment of Energy, and Nether- lands Department of Mines, the

Gorilla rig is designed to survive up to 90-foot waves and 82-knot winds while drilling in 328 feet of water.

The rig has power to spare, with seven Caterpillar D399 diesel en- gines with a total output of 11,080 bhp at 1,225 rpm driving seven generators producing a total of 7,210 kw. Power for the Gorilla's propulsion assist system is pro- vided by eight electric motors with a total output of 6,800 hp con- nected through gearboxes to two 112-inch propellers in Kort noz- zles. These motors are mounted on the machinery deck on either side of the drilling slot. When using a 10,000-bhp tug, the assist thrus- ters will increase the towing speed by about two knots.

Living accommodations are pro- vided for 80 persons, as well as a six-bed hospital, dual galley, din- ing room, and recreation facilities.

The rig's survival system consists of two 50-man and two 34-man

Whittaker enclosed capsules, U.S.

Coast Guard approved and fitted with internal communications sys- tems. A heliport cantilevered out over the bow has a diameter of 83 feet and 52,500-pound impact load.

Two other Gorilla Class rigs are now under construction, one at

Marathon's rig yard in Singapore and one at the Vicksburg yard.

SANTA FE RIGS

Daewoo Shipbuilding

Daewoo Shipbuilding and Heavy

Machinery Ltd. in Korea delivered in the last quarter of 1983 a sec- ond semi-submersible drilling rig to Santa Fe Drilling Company of

Orange, Calif. Both Santa Fe rigs are self-propelled, Friede and

Goldman L-907 Pacesetter types, and were constructed at a price of $80 million each. These rigs are capable of 25,000 feet in water depths up to 1,500 feet. Living quarters are provided for 96 persons.

Since opening a little more than two years ago, Daewoo's Okpo

Shipyard has delivered eight drill- ing rigs of two types. In addition to the two built for Santa Fe Drill- ing, the yard has constructed two semi-submersibles for Reading &

Bates Drilling Company of Hous- ton, and one each for Houlder Off- shore Drilling Company and At- lantic Drilling Company, both of the U.K.

A semi-submersible rig for Ko- rea Drilling Company is now un- der construction at the Okpo yard.

With this rig's delivery in the spring of 1984, Korea Drilling will be the first Korean company to own a drilling rig it operates. The rig will be used to explore Korea's continental shelf and other na- tional coastlines.

SEDCO 602

Promet Private Ltd.

A medium-sized, semi-submers- ible drilling rig, the Sedco 602, was delivered recently by Promet

Private Limited shipyard in Sin- gapore. The rig is owned jointly by

Sedco, Inc. of Dallas and Occiden- tal Exploration & Production

Company of Bakersfield, Calif., and Houston.

Designed by Earl & Wright, the

Sedco 602 can operate in water depths of 25 to 180 feet. The moor- ing tensioner riser and drill fluid systems have been designed for exploratory and development drill- ing to 20,000 feet. The design of this semi-submersible makes it particularly useful in parts of the world where drillships are ineffi- cient and the cost of using huge semi-submersibles uneconomical.

The rig's main deck measures 170 by 170 feet. It has living quar-

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Sikorsky S-61N helicopter.

The Sedco 602 is classed by the

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SEDCO 712/714

Hyundai Heavy Industries

Seven semi-submersible drilling rigs were delivered to Sedco Inc. of

Dallas between November 1982 and July 1983. Delivery of these new offshore rigs brought the Sedco drilling fleet up to 42 units; the company reported that all rigs were under contract.

Four of the Sedco 700 Class and three of the Sedco 600 Class were delivered by three shipyards in the Far East. The first of the new deliveries, the Sedco 711, was completed in November 1982, just 24 months after the order was placed with Hyundai Heavy In- dustries of Ulsan, Korea. The Sedco 712 and the Sedco 714 were also built at Hyundai—the first time in

Sedco's history that three of its rigs have been under construction at one shipyard at the same time.

Total contract value for the three (continued on page 48)

Maritime Reporter/Engineering News