Our oil drilling graphite powder has excellent lubrication, so can effectively reduce torque, wear and fatigue of the drilling, to extend the entire life cycle of the bit bearing. And also able to reduce the frictional resistance of the drill string, shorten the trip time; and prevent stuck, bit balling. The graphite powder can be strongly adsorbed in drilling tool and side wall, so as to improve the state of the friction between the friction pair, to play a role in reducing friction. Meanwhile, graphite powder adsorption in the side wall, the side wall microvoid can be closed, so can achieve double effects on reducing the filtration of drilling fluid and protecting reservoirs.