Greatwall Drilling Company (GWDC), a Subsidiary of China National Petroleum Corporation (CNPC), successively merged and reorganized with the drilling/completion business and down-hole operation business of Liaohe Oilfield Company. After more than 20 years of development, it has switched from a drilling and workover services provider to a comprehensive technical service company that provides a full range of integrated services to customers around the world. GWDC business scope covers various aspects of Oil and Gas exploration, development and production, and Geothermal Energy development. Our business encompasses all sectors of the entire petroleum engineering and technology industry chain which includes Geological Research, Drilling, Workover, Drilling Fluid, Cementing, DD, Mud logging, Electric Logging, Acidizing, Fracturing, O&G Production Optimization, and more. Leading technology, diversified intelligent team and international enterprise scale make us the leader in China's oil and gas field service industry. GWDC has business presence in 18 provinces and autonomous regions within China, and other 28 countries in South America, Africa, Middle East and Asia. Over 1000 management personnel, 5000 engineers, and 20000 skilled workers provide high quality and efficient oil and gas field technical services to hundreds of customers around the world.