China Oilfield Services Limited (COSL) delivers a comprehensive suite of integrated offshore oilfield services to clients across Mainland China and internationally. Its operations are strategically divided into four principal segments: Drilling Services, Well Services, Marine Support Services, and Geophysical Acquisition and Surveying Services. The Drilling Services division provides various drilling platform solutions, including jack-up, semi-submersible, modular, and land rigs, in addition to specialized services like casing and tubing, and pipe inspection and repair. This segment oversees a significant asset base, which includes 36 jack-up drilling rigs, 12 semi-submersible drilling rigs, and 6 modular rigs. Well Services offers a wide array of onshore and offshore well-related operations. These encompass logging, management of drilling and completion fluids, directional drilling, cementing, well completion and workover procedures, stimulation services, and optimization of oilfield production. Through its Marine Support Services, COSL furnishes crucial maritime assistance. This includes anchor handling, towing of drilling rigs and engineering barges, oil lifting, offshore transportation, standby duties, firefighting, rescue missions, and support for oil spill response. This segment manages a substantial fleet of approximately 130 vessels, such as anchor-handling tug/supply vessels, platform supply vessels, multi-purpose vessels, barges, and shuttle-tankers. Lastly, the Geophysical Acquisition and Surveying Services segment focuses on marine seismic data acquisition, offshore geological surveys, processing and interpretation of seismic data, and underwater engineering. This division utilizes 6 seismic vessels, 2 ocean bottom cable teams, and 5 engineering surveying vessels. Beyond its core service offerings, China Oilfield Services Limited also participates in capital markets by issuing bonds. The company's headquarters are located in Sanhe, China, and it operates as a subsidiary of China National Offshore Oil Corporation.