The 2015 China Petroleum and petrochemical engineering technology and materials and equipment promotion conference was sponsored by China Equipment Management Association and Yanchang Oilfield Co., Ltd. the co organizers were Shaanxi Yanchang Petroleum Materials Co., Ltd., Lanzhou Lanshi Group Co., Ltd., Shaanxi equipment management association, China man petroleum and Natural Gas Group Co., Ltd., and Shaanxi Yanchang Petroleum machinery and equipment manufacturing Co., Ltd, Suzhou Changsheng chain transmission Co., Ltd