Successful application of air/nitrogen drilling techniques in Xushen-28 well

The deep formation in Daqing Oilfield features in good digenesis, strong abrasiveness, high rock drillability, and high hardness. As a result, the conventional rate of penetration is low, the drilling bit is severely worn, and drilling cycle gets longer. So how to increase the penetration rate is an urgent problem to be solved in Daqing Oilfield. To solve the problem, gas drilling test is conducted in the Xushen-28 well. Through geological analysis, casing program design is taken in suitable well sections, the packed hole assembly is selected, drilling bit and drilling parameters are optimized, the discharge capacity of gas injection is determined. Successful gas drilling test is ensured by using the techniques mentioned above. It ensures the well bore quality, avoids borehole deviation and increases penetration rate. Meanwhile, the application of nitrogen drilling in the producing formation provides scientific basis for the nitrogen drilling in deep producing formations in Daqing Oilfield. The good application of gas drilling techniques in Xushen-28 well shows that the gas drilling technique in Daqing Oilfield is further improved by applying the method to determine the minimum discharge capacity and the gas lifting technique. The speed of exploration and development in the Xujiaweizi area is accelerated.