Rig: COSLProspector

Name COSLProspector
Owner COSL Drilling Europe AS
Manager COSL Drilling Europe AS
Rig Type Semisub
Sub Type Deepwater Floater
Jackup Type --
Max Water Depth (ft) 5000
Max Drill Depth (ft) 25000
Dimensions (ft) 343 x 231 x 57
Leg Length (ft) --
Competitive Yes

Current Location

Country China (PRC)
Region East Asia

Drilling Equipment

Drawworks Type National Oilwell Varco AHD-750
Drawworks HP 5750
Mud Pumps Type National Oilwell Varco Hex 240
Top Drive National Oilwell Varco HPS-750
Hookload Capacity (lbs) 1500000

Rig Construction Details

Rig Design Agility Group
Rig Model GG5000
Year Built 2014
Country of Build China (PRC)
Yard Name Yantai CIMC Raffles
Group Yard Name Yantai CIMC Raffles Offshore Ltd.

Rig Contract Details

Operating Status Ready Stacked
Operator --


16 Jul 2015

'COSLProspector' spuds first well in South China Sea

China Oilfield Services Limited (“COSL”) said its deepwater drilling rig COSLProspector recently has commenced drilling operation for its first oil well in the deep water regions in South China Sea. In order to ensure smooth completion of this inaugural drilling operation, the Company made thorough pre-drilling preparations. This operation is carried out for an oil well sitting at a water depth of 1,289 meters, and a designed drilling depth of the rig at 3,626 meters. COSLProspector is a deepwater semi-submersible drilling rig equipped with Dynamic Position System with a maximum operation water depth of 1,500 meters and a maximum drilling depth of 7,500 meters. This rig has met requirements by both Det Norske Veritas (“DNV”) and NORSOK standards for offshore drilling platforms. This rig has met requirements to operate under freezing temperature, environmental-friendly and low temperature conditions, capable of performing operations in waters under extreme conditions. It can adapt to 90% of the water conditions in the world. Smooth operation of COSLProspector provides leading technology and equipment support to COSL’s participation in competition in the international deepwater drilling market.

30 Apr 2015

'COSLProspector' goes to work for CNOOC

On 30th April 2015, the COSLProspector semisub officially left the deep-water wharf of CIMC Raffles and joined the deepwater fleet of CNOOC. COSLProspector is the fourth deepwater semisubmersible drilling rig delivered by CIMC Raffles for China Oilfield Services Limited (“COSL”). It can operate in all sea areas except for the arctic. The operational water depth is up to 1,500 meters, whilst drilling depth is up to 7,600 meters, designed temperature -20?, accommodation for 130 personnel and the maximum variable deck load of 5,500 tons. The unit is equipped with most advanced National Oilwell Varco (“NOV”) drilling system and DPS-3 dynamic position system and is classed by both DNV and CCS. The COSLProspector is also classified for operations in Norway. Since the delivery of the unit on 19th November 2014, an 80 strong engineering team has been dedicated to the preparation project, including preparing the ROV system, combustion beam system and mud log system. 50 of them spent Chinese Spring Festival on the rig.

19 Nov 2014

COSL takes delivery of COSLProspector

COSLPROSPECTOR, the fourth deep-water semisubmersible drilling rig built by CIMC Raffles for COSL, has been delivered in Yantai, Shandong. The unit has the ability to work in the harsh Norwegian North Sea. The COSLPROSPECTOR is a DP3 vessel with length of 104.5 meters, width of 70.5 meters, height of 37.55 meters, and an operating depth of 1,500 meters, a drilling depth of 7,600 meters and a designed operating temperature of minus 20 degrees Celsius. A maximum variable deck load of 5,000 tonnes, the multi-function platform is also able to accommodate 130 personnel. It is classed by DNV and CCS, and satisfied with the strictest standards of PSA and NORSOK. Equipped with 10,000 controllers and alerts, the remote monitoring can be achieved in this high-automatic unit. On the base of GM-4000 series, COSLPROSPECTOR is jointly designed by AG (Agility Group), COSL and CIMC Raffles. Furthermore, CIMC Raffles is responsible for all detailed design, construction and commissioning work. It adopts the most advanced power management and environmentally-friendly design concept, and facilities with DP3 close bus-tie, variable frequency drive, escape chute system and auto ice-cleaning technology. Compared with last delivered COSL series semisubmersible drilling rigs (COSLPIONEER, COSLPROMOTER and COSLINNOVATOR), COSLPROSPECTOR adds ICE-T, CLEAN and WINTERIZATION, to satisfy ice-class, environmentally-friendly and low-temperature requirements. COSL Prospector is made up by 112 blocks, over 700 mechanical equipment, more than 800,000 meters cable and 35,000 pipes. There are 46,500 test points of MCR, which is increased by 45% compared with three semi drilling rigs of the same series delivered already. 118 significant technical improvements have been made. In addition, weight deviation between inclined test and theoretical calculation is 80 tons and the noise level is controlled less than 45 dB in the living area.

8 Oct 2014

'COSLProspector' begins sea trials in China

The ‘COSLProspector’, the fourth semisub drilling rig to be provided to China Offshore Services Limited (COSL) has begun sea trails with cooperation from Yantai Harbor Pilotage and Beihai Resure Bureau. This sea trial is organized by CIMC Raffles, COSL, DVN, CCS, Rolls-Royce, Siemens and Kongsberg, aiming to commission and test for 609 sub-systems and 70 systems, including thrusters, PMS, DP, Close Ring, FMEA, communication, endurance capability, automatic cabin, lifesaving and mooring. During this sea trial, it is the first time to make engine management system close ring test applied to deep-water semisubmersible drilling rig in the whole world. Compared with usual power distribution design, it will reduce dynamos and 5% fuel. This environmentally-friendly system will be the mainstream power distribution design in high-performance semisubmersible drilling rig. The unit is expected to be delivered in November 2014 and does not yet have a firm contract in place.

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