Organic-inorganic hybrid thixotropic agent for oil well cement as well as preparation method and application of organic-inorganic hybrid thixotropic agent

The invention provides an oil well cement organic-inorganic hybrid thixotropic agent and a preparation method and application thereof.The thixotropic agent comprises, by weight, 5-6 parts of inorganic matter and 3-4 parts of organic polymer, the inorganic matter is calcium sulfate or aluminum sulfate or bentonite, and the organic polymer comprises 1-2 parts of unsaturated polyether macromonomer and 0.2-0.3 part of acrylamide monomer; 1-2 parts of carboxylic acid monomers and 0.5-1 part of sodium hydroxide, wherein the unsaturated polyether macromonomer is isopentenol polyoxyethylene ether with the number-average molecular weight of 2400. The unsaturated polyether macromonomer is introduced into the thixotropic agent, so that the dispersion effect of inorganic matters in cement paste is enhanced, the unsaturated polyether macromonomer with a long chain generates a steric hindrance effect on the surfaces of cement particles, flocculation among the cement particles is prevented, and the thixotropic property of t