Preparation method of temperature-resistant organobentonite, temperature-resistant organobentonite and application of temperature-resistant organobentonite

The invention discloses a temperature-resistant organic bentonite preparation method, which comprises: S1, mixing a bentonite dry material with an alkali liquid, carrying out a first hydrothermal reaction, filtering, washing, and drying to obtain a solid 1; s2, mixing the obtained solid I with a magnesium salt solution, carrying out a second hydrothermal reaction, and then filtering, washing and drying to obtain a solid II; s3, contacting the obtained solid II with a sodium carbonate solution to carry out first reaction, and then filtering, washing and drying to obtain a solid III; and S4, contacting the obtained solid III with a dioctadecyl dimethyl benzyl ammonium chloride solution to carry out a second reaction, and then filtering, washing and drying to obtain the temperature-resistant organic bentonite. The invention also discloses the organobentonite prepared by the preparation method and application of the organobentonite in drilling fluid. The organic bentonite prepared by the method disclosed by the i