China Oilfield Services Limited (COSL) is a prominent integrated oilfield services provider based in Sanhe City, Hebei, China. Established in 2001, COSL operates in over 40 countries, delivering a wide range of services to the oil and gas industry. Its core offerings include drilling services, well services, geophysical services, and marine support services.

COSL operates a fleet of 29 drilling rigs and has completed numerous wells, showcasing its operational capacity. The company provides advanced well services, including workover and cementing, and specializes in innovative technologies for drilling and completion. Its geophysical services enhance exploration and development activities, while marine support services ensure safe offshore operations. COSL also manufactures high-quality chemical products, sand control screens, and various tools and equipment to support its operations.

With a diverse customer base across multiple regions, COSL emphasizes tailored solutions and has reported significant revenue growth, reflecting its strong position in the market. The company is committed to technological innovation and operational excellence in the oil and gas sector.