The high-pressure nitrogen directional drilling rig technology is an underbalanced drilling technology that uses high-pressure nitrogen as the circulation medium. Compared with ordinary drilling technology, it has the advantages of high mechanical rotation speed and good safety. Therefore, high-pressure nitrogen drilling has a high mechanical drilling speed, generally 3 to 8 times that of conventional drilling fluid drilling methods. High-pressure nitrogen drilling technology can more easily penetrate abnormal formations. Since there is no liquid phase in gas drilling, there is no problem of wellbore wall hydration instability. High-pressure nitrogen drilling is relatively safe. With normal supporting and monitoring means, harmful gas pollution and gas deflagration generally do not occur.