Polyurethane self-sealing rubber core for well drilling and production process

The invention discloses a well-drilling polyurethane self-sealing rubber core and a production process thereof, relating to a formulation design of a well-drilling polyurethane self-sealing rubber core and a preparation process thereof. The invention is characterized in that the formulation contains a component 1 and a component 2, and the ratio of component 1 to component 2 is 100:6 to 100:600 by mass ratio; the component 1 contains 0-76.4% of component A and 23.6-100% of component B in terms of mass percentage, while the component 2 contains 0-90% of component A and 10-100% of component C terms of mass percentage; and the component A contains polyalcohol, benzoyl chloride, phosphoric acid or hydrochloric acid, the component B is polyisocyanate, and the component C contains trimethylolpropane, glycol or ethylene glycol, inorganic filler, energy auxiliary agent and anti-foaming agent, benzoyl chloride, phosphoric acid or hydrochloric acid, and catalyst. The production process decreases the operation temperatu