Harry L. Chang

China Oilfield Technology Services Group Ltd. operates as an investment holding company, which provides integrated tertiary oil recovery equipment and products. It engages in the research, development, manufacture, and sales of customized integrated equipment and products that are used in enhancing the extraction of crude oil. It operates through the following segments: Enhanced Oil Recovery, Environmental Protection, and Energy Saving & Others. The Enhanced Oil Recovery segment produces polymer injection and Alkaline-surfactant-polymer injection equipment. The Environmental Protection segment offers Alkaline-surfactant-polymer residual liquid treatment system and chemical solutions. The Energy Saving & Others segment manufactures integrated electrical control station, energy saving equipment for oil pumping unit and customizes pumps & parts. The company was founded on June 14, 2007 and is headquartered in Daqing, China.