Nitrogen drilling is to use nitrogen as circulating medium to cool the drill bit and carry out cuttings, which is generally used for efficiency improvement in deep well drilling or reservoir drilling. There are the characteristics of low porosity-permeability, low abundance and low production in middle-shallow reservoir of Daqing oilfield, mining by the conventional drilling process will result in reservoir damage and greatly reduce the output of crude oil. The paper introduces the application of nitrogen drilling technology, diesel dilution and screen pipe completion in middle-shallow reservoir of Daqing oilfield. Based on the field tests and exploration in 4 wells, the support technologies have been formed for drilling and completion in middle-shallow reservoir of Daqing oilfield. The analysis on the site application effect shows the feasibility and importance of nitrogen drilling in middle-shallow reservoir mining of Daqing oilfield.