Abstract:  In the process of drilling, safety risk early warning management is implemented in Huabei Oilfield in order to ensure that the risks of drilling crew, equipment, well control, downhole and environment are controlled in an acceptable range, and the hidden dangers or complex accidents are eliminated in the bud. The drilling team, drilling company, construction party and supervision party can carry out risk identification, evaluation and risk rating from the whole life cycle of a well by establishing the four-level risk early warning. Risk warning is carried out for orange and red safety risks, and risks and hidden dangers are investigated so as to eliminate serious accidents such as well control casualties and environmental pollution and to ensure the smooth and safe operation of drilling construction

Key words: drilling risk, risk warning, risk grade, hidden danger investigation