Sinopec Oilfield Service Corporation provides petroleum engineering and technology services. It operates through Geophysics, Drilling Engineering, Logging and Mud Logging, Special Down-hole Service, and Engineering Construction, and Others segments. The Geophysics segment offers terrestrial and marine geophysical exploration, development, and technical services. The Drilling Engineering segment provides land and ocean drilling design, construction, and technical services, as well as drilling instrumentation. The Logging and Mud Logging segment offers land and ocean project contracting and technical services for collection, monitoring, transmission, processing, and interpretation, as well as evaluation of wellbore oil and gas, geology, and engineering information. The Special Down-Hole Operations segment provides oil engineering technical and construction services, including oil testing, well repair, lateral drilling, fracturing, acidizing, and oil assignments. 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.