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China’s CIMC Raffles is set to deliver two deep-water, semi-submersible drilling rigs, OOS Gretha and OOS Prometheus, from Yantai.

With an overall length of 137.5m, beam of 81m, depth of 39m and maximum variable load of 7,070t, the OOS Gretha rig has the capacity to house 618 people and is equipped with a DP3 system, classed by ABS.

The asymmetric semi-submersible unit has been designed and equipped with two 1,800t offshore mast cranes which can perform tandem lifting.

According to the company, the improved movement performance can withstand high sea waves of more than 22m.

Due to these features, the vessel can serve in West Africa, Brazil, the Gulf of Mexico and the North Sea, to meet the quality specification of the UK Health and Safety Executive (HSE).

CIMC Raffles’ second rig, OOS Prometheus, has a length of 118m, width of 70m, depth of 38m, maximum variable load of 5,000t and accommodates 500 people.

Equipped with one set of 1,100t deck crane, with 3,000m² of clear space, the rig has a maximum operation depth of 1,000m, was classed by ABS and can supply enough storage room for large offshore equipment.

CIMC Raffles designed and constructed the two boats in-house, from basic design, detail design to shop design.

For sea keeping test, towing basin test and wind tunnel experiment, the CSIC 702 institute and Harbin Engineering University participated in the basic design.

In October 2010 and April 2011, CIMC Raffles delivered two units of deep-water semi-submersible drilling rigs, the SS Pantanal and SS Amazonia.

At present, the SS Pantanal is wildcatting the 14th oil well in the Campos basin, and the SS Amazonia, the fourth in Santos basin – both of them serve Petrobras.


Image: CIMC’s delivery of two semi-submersible drilling rigs. Photo courtesy of YANTAI CIMC RAFFLES SHIPYARD LIMITED.

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