Sinopec Oilfield Service Corporation provides petroleum engineering and technology services. It operates through Geophysics, Drilling Engineering, Logging Engineering, Downhole Operation Engineering, and Engineering Construction, and Others segments. The Geophysics segment offers land and marine geophysical exploration, development, and technical services. The Drilling Engineering segment provides onshore and offshore drilling design, construction, and technical services, as well as drilling equipment. The Logging Engineering segment provides engineering contracting and technical services for collection, monitoring, transmission, processing, and interpretation, as well as evaluation of wellbore oil. The Downhole Operation Engineering segment provides oil engineering technical and construction services, including oil testing, workover, sidetracking, fracturing, acidizing and Petroleum engineering technical services, and engineering construction such as offshore operations. The Engineering Construction segment engages in the provision of feasibility studies; design, procurement, and construction services for onshore and offshore oil and gas fields, long-distance pipeline, oil and gas transporting process, storage and transportation, petrochemical supporting, building construction, water resources and hydropower, ports and waterways, electricity transmission, and distribution projects; manufacturing of pressure vessels; LNG projects; and coal chemical engineering, geothermal utilization, energy saving, and municipal roads and bridges. The company was formerly known as Sinopec Yizheng Chemical Fibre Company Limited and changed its name to Sinopec Oilfield Service Corporation in March 2015. The company was founded in 1993 and is headquartered in Beijing, the People's Republic of China. Sinopec Oilfield Service Corporation is a subsidiary of China Petrochemical Corporation.