Chinese drilling contractor China Oilfield Service Ltd (COSL) has sent one of its jack-up rigs for major retooling work at a compatriot yard, with a lowering of emissions being targeted.

The Hai Yang Shi You 922 arrived at China Merchants Jinling Shipyard (Weihai) late last week in eastern China’s Shandong province for a major turnaround covering the repair of the hull and valves and living quarters as well as re-modification of the jacking system.

Significantly lowering emissions from the rig is one of the aims of the retooling work.

The rig was built by China’s Offshore Oil Engineering Company in 2010 and went through an overhaul at Shanhaiguan Shipbuilding in northern China’s Hebei province in 2014.

The rig is designed to operate in water depths of 61 metres and drill to a depth of 6000 metres.

It has been chartered by China National Offshore Oil Corporation for a drilling campaign in shallow waters of Bohai Bay.

COSL operates 31 jack-up rigs, including five chartered from Chinese yards for work domestic waters since early this year.