Multifunctional plugging agent as well as preparation method and use method thereof

The invention relates to the technical field of leaking stoppage in drilling operation, in particular to a multifunctional leaking stoppage agent and a preparation method and using method thereof.The multifunctional leaking stoppage agent is prepared from 5%-10% of a granular leaking stoppage agent, 10%-20% of a reinforcing agent, 20%-30% of silica powder, 2%-6% of a gelatinizing agent, 2%-5% of a cross-linking agent, 20%-30% of calcium oxide, 10%-20% of kieselguhr and 1%-3% of a dispersing agent, and the multifunctional leaking stoppage agent is obtained after the components are evenly mixed. And then preparing the plugging slurry, pumping the plugging slurry into a leakage layer, thickening and solidifying to plug the leakage layer or a water layer. According to the plugging agent, bridge plug plugging, gel plugging and chemical consolidation plugging are combined, the formed'plugging section 'has high compressive strength and plugging capacity and low permeability, the problem of well leakage in the oilfie