Greatwall Drilling Company (GWDC), a subsidiary of China National Petroleum Corporation (CNPC) and an IADC member, is engaged in the worldwide business of petroleum engineering and technical services. Our business scope covers various processes of petroleum engineering and technical services and energy development. We provide integrated oil and gas well construction solutions for our clients from well design, drilling operation and mud services to well completion in various surface and underground conditions. We offer wireline logging, mud logging and well testing operations based on the practical combination of advanced technologies. The integrate interpretation of data acquired from those operations offers solutions to a variety of geologic situations. We expand services globally and vigorously for general contracting ...