China Oilfield Services 

China Oilfield Services Limited (COSL), a subsidiary of China National Offshore Oil Corporation, is headquartered in Sanhe, China, and, along with its various operating units, delivers a comprehensive suite of offshore oilfield services both within Mainland China and across global markets. Its operations are structured into four primary divisions: Drilling Services, Well Services, Marine Support Services, and Geophysical Acquisition and Surveying Services. The Drilling Services segment specializes in offering various drilling rig solutions, including those for jack-up, semi-submersible, modular, and land-based operations. This also encompasses casing and tubing services, alongside the inspection and repair of running pipes, managing a significant fleet comprising 36 jack-up rigs, 12 semi-submersible rigs, and 6 modular rigs. Within Well Services, the company provides an array of essential onshore and offshore support, such as logging, management of drilling and completion fluids, precision directional drilling, cementing, well completion and workover, well stimulation, and optimization strategies for oilfield production. The Marine Support Services division encompasses a wide range of maritime operations, from anchor handling and the towing of drilling rigs or engineering barges to oil lifting, offshore transport, standby duties, firefighting, rescue missions, and oil spill response, boasting a substantial fleet of roughly 130 vessels, including anchor-handling tug/supply vessels, platform supply vessels, multi-purpose vessels, barges, and shuttle tankers. Finally, the Geophysical Acquisition and Surveying Services segment focuses on specialized marine activities like seismic data acquisition, offshore geo-surveying, the processing and interpretation of seismic data, and various underwater engineering tasks, utilizing assets that include 6 seismic vessels, 2 ocean-bottom cable teams, and 5 engineering surveying vessels. COSL also participates in the bond market.