Underwater non-dispersible cement paste for well drilling leakage stoppage as well as preparation method and application of underwater non-dispersible cement paste

The invention relates to underwater non-dispersible cement paste for well drilling leakage stoppage and a preparation method and application thereof, and the underwater non-dispersible cement paste for well drilling leakage stoppage comprises the following components in parts by weight: 100 parts of oil well cement, 5-35 parts of fly ash, 0-50 parts of silica fume, 0.5-4 parts of a water reducing agent, 2-8 parts of a hydrophobic flocculant and 55-100 parts of water. The underwater non-dispersible cement paste for well drilling plugging disclosed by the invention has excellent water dispersion resistance, the density of the prepared cement paste is 1.4-1.7 g/cm < 3 >, the initial consistency is lower than 30Bc, the on-site pumping requirement is met, the thickening time of the cement paste at 80-160 DEG C is adjustable in 3-6 hours, the 24-hour compressive strength is greater than 6MPa, and the technical requirement of water-bearing stratum plugging is met. 本发明涉及一种用于钻井堵漏的水下不分散水泥浆及其制备方法和应用，所述用于钻井堵漏的水下不分散水泥浆，包含