Dongying Ruifeng Petroleum Technology Development Co., Ltd. (Ruifeng Petroleum) was established in 1998, with its headquarters located in Dongying, the heart of China's Shengli Oilfield. It is dedicated to the research and development and service of oil and gas well completion technology. The company possesses a number of internationally leading technologies, such as the MZGP multi-layer gravel filling system and AICD water control screen pipe, and has obtained over 100 national patents. It has also passed international certifications such as API and ISO. Its manufacturing base in Qingdao has an annual production capacity of 6,000 sets of completion tools and 80,000 meters of screen pipes. Ruifeng Petroleum is a core supplier for CNPC, Sinopec and CNOOC. Its business covers major domestic oil fields as well as overseas markets such as Russia and Chad. It has won industry recognition with innovative technologies and efficient services.