OptaSense Protects Sour Gas Pipeline in Sichuan Province, China Chuandongbei Natural Gas Project Project Overview Chevron operates the 487,000-acre (1,969-sq-km) Chuandongbei (CDB) natural gas area in the onshore Sichuan Basin, China. Chevron has a 49 percent interest in the project, with PetroChina (CNPC) having the other 51 percent. The full development includes two sour gas (high hydrogen sulfide and carbon dioxide content) processing plants connected by a gas gathering system for five natural gas fields. Chuandongbei is a large onshore gas project that is an important supplier of clean and affordable energy to the rapidly growing economy in southwest China. In 2014, the company continued construction of the first natural gas processing plant and development of the

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