Daqing Damei coring technology network belongs to Daqing Damei Petroleum Equipment Manufacturing Co., Ltd,it was established in 1980. Its predecessor was the Drilling Technology Research Institute of Daqing World War Drilling Command. In 1995, Daqing Oilfield was diverted with capital and transformed into a joint-stock enterprise. Daqing Oilfield affiliated enterprises, and in the international first to achieve coring tools overall anti-corrosion phosphating treatment process, our center set coring tools, design, manufacturing, technical services as one of the professional manufacturers, the existing senior engineers 4, engineers 6, technicians 25. Our center products have been applied in Daqing Oilfield for 40 years, and have developed "deep well anti-inversion conventional coring tools", "closed coring tools", "hydraulic sealing coring tools", "shallow hydraulic conventional coring tools", "horizontal well coring tools", "inclined well coring tools", "small diameter coring tools" (121 coring tools, 127 coring tools, 133 coring tools, 140 coring tools). Coring tools and 168 coring tools". From Pushen-I well (4500m) to Xujiaweizi gas field in 1998, the depth exceeded 4000 meters, with 87 coring wells reaching 99.8%, nearly 150 sealed coring wells reaching 95% and 98%. The well depth ranges from 500m to 5500m. The core recovery rate of Qinghai Lenghu gypsum rock is 56%. The natural diamond impregnated bit has achieved good results in taking core footage of 3500m (quartz-bearing granite) in geothermal wells of Xiongan New Area at a speed of 0.5m footage per hour with a yield of 100%. The core recovery rate of elastic colloid mudstone is 80% in two wells of 3000m in the fourth hydro-engineering Geological Brigade of Hebei Geological Mine. Coring recovery and sealing rate of 3300m gravelly fractured hard formation in Xiasiwan, Changqing Oilfield coring recovery rate is 85% and Core sealing rate is 90%. Our unit has provided early a hundred services for major oil fields and drilling companies in China. It has received high praise from Wupu, Sichuan, Dagang, Jilin, Xinjiang, Changqing, Shandong Shengli, Tianjin Geothermal Exploration and Design Institute, Hebei Geological Mine, Shandong Geological Mine, Inner Mongolia Coalfield, Shanxi Coalfield, Shandong Kerui, Hong Kong Zhongke Baitian, Beijing Huayou and more than a dozen foreign countries. Products are exported to Russia, Kazakhstan, Ukraine, the United States, Sudan, Colombia and other 15 countries. Eight patents have been granted, which is one of the two major coring companies in China (only Chuanqing Coring Company of Sichuan Administration and our Daqing Oilfield Coring Company are two professional teams in China).