Drillship

Drillships are self-propelled ships equipped for drilling. They keep station over the well by means of a computer-controlled thruster system known as dynamic positioning. Drillships operate in water depths in which jack-ups rigs are incapable of working and can drill in deep and ultra-deep waters.

Semi-submersibles

Semi-submersible rigs consist of a deck containing the working areas and equipment and the living quarters, supported by a hull which consists of vertical columns connected to horizontal pontoons. Such rigs operate in a 'semi-submerged' position, with the lower hull ballasted down below the waterline. In the case of a dynamically-positioned (DP) semisub, the rig keeps station over the wellhead location by means of a computer-controlled thruster system. In the semi-submerged position, it provides a stable platform for drilling, due in part to its wave transparency characteristics at the water line. The 'generation' to which a semi sub belongs is often given - this indicates the period when the rig was built and, to a certain extent, its water depth and deck-load capabilities. The latest rigs are sixth-generation. A semi-submersible rig with DP capability can drill in conventional, deep and ultra-deep waters.

SEMI-SUBMERSIBLES
(Moored)

Semi-submersible rigs consist of a deck containing the working areas and equipment and the living quarters, supported by a hull which consists of vertical columns connected to horizontal pontoons. Such rigs operate in a 'semi-submerged' position, with the lower hull ballasted down below the waterline. In the case of a dynamically-positioned (DP) semisub, the rig keeps station over the wellhead location by means of a computer-controlled thruster system. In the semi-submerged position, it provides a stable platform for drilling, due in part to its wave transparency characteristics at the water line. The 'generation' to which a semi sub belongs is often given - this indicates the period when the rig was built and, to a certain extent, its water depth and deck-load capabilities. The latest rigs are sixth-generation. A semi-submersible rig with DP capability can drill in conventional, deep and ultra-deep waters.

Jack-up

Jack-up rigs are mobile, self-elevating drilling platforms equipped with tubular structure legs that are lowered to the sea floor. Tugboats tow a jack-up rig to the drill-site as a vessel, with its hull riding the sea and its leg raised. At the drill-site, the legs are lowered until they rest on the seabed and jacking continues until the hull is elevated above the surface of the water. Drilling operations can then begin. When they are completed, the hull is lowered until it rests in the water, the legs are raised and the rig can be relocated to another drill-site.

Tender rig

Self-erecting tender rigs allow for drilling operations to be performed from a wellhead platform without the need for a permanently installed drilling package. The tender is moored next to the platform where wells are to be drilled and the modularised drilling package is lifted onto the platform. Drilling operations are supported by facilities on the tender, including storage for drilling supplies, power generation facilities for running the drilling equipment and well completion equipment. The tender also has living quarters and a helicopter deck. Tender rigs are either barge-based or have semi-submersible hulls. Both carry the same equipment, but the semi-submersible rig is able to operate in rougher weather conditions.

Semi-tender

Self-erecting tender rigs allow for drilling operations to be performed from a wellhead platform without the need for a permanently installed drilling package. The tender is moored next to the platform where wells are to be drilled and the modularised drilling package is lifted onto the platform. Drilling operations are supported by facilities on the tender, including storage for drilling supplies, power generation facilities for running the drilling equipment and well completion equipment. The tender also has living quarters and a helicopter deck. Tender rigs are either barge-based or have semi-submersible hulls. Both carry the same equipment, but the semi-submersible rig is able to operate in rougher weather conditions.

Next Fleet type
T15 Type: Tender rig
Location: Southeast Asia
Availability: Jul 2019
Maximum depth: 6,500 feet
T16 Type: Tender rig
Location: Southeast Asia
Availability: Aug 2019
Maximum depth: 6,500 feet
West Aquarius Type: Semi-submersible
Location: Canada
Availability: Apr 2017
Maximum depth: 10,000 feet
West Auriga Type: Drillship
Location: USA
Availability: Oct 2020
Maximum depth: 12,000 feet
West Capella Type: Drillship
Location: West Africa
Availability: Available
Maximum depth: 10,000 feet
West Capricorn Type: Semi-submersible
Location: USA
Availability: Jul 2019
Maximum depth: 10,000 feet
West Leo Type: Semi-submersible
Location: West Africa
Availability: Jul 2018
Maximum depth: 10,000 feet
West Polaris Type: Drillship
Location: West Africa
Availability: Mar 2018
Maximum depth: 10,000 feet
West Sirius Type: Semi-submersible
Location: USA
Availability: Jul 2017
Maximum depth: 10,000 feet
West Vela Type: Drillship
Location: USA
Availability: Nov 2020
Maximum depth: 12,000 feet
West Vencedor Type: Semi-tender
Location: West Africa
Availability: Sep 2018
Maximum depth: 6,500 feet

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