The invention provides a self-plugging releasing temperature resistant temporary plugging agent used for water-based
drilling fluid, the self-plugging releasing temperature resistant temporary plugging agent comprises nano
calcium carbonate and a product which is obtained by reacting
starch,
alkali metal hydroxide, halogenated
organic acid,
carbonate, a hydrophobic modification agent and
alcohol with water. The invention also provides a preparation method of the self-plugging releasing temperature resistant temporary plugging agent used for the water-based
drilling fluid, and the self-plugging releasing temperature resistant temporary plugging agent used for the water-based
drilling fluid can be obtained by proportionally adding components into a kneading
machine for kneading. The self-plugging releasing temperature resistant temporary plugging agent has strong high
temperature resistance, and can
resist the temperature up to 140 DEG C; and the self-plugging releasing temperature resistant temporary plugging agent has good temporary plugging effect and significant reservoir protection effect, and the water-based drilling fluid added with the temporary plugging agent has high temporary plugging rate and
oil phase permeability
recovery rate; at the same time, the temporary plugging agent has self-plugging releasing ability. During the late flowback, the self-plugging releasing can be realized by formation of a hydrophobic channel without
acid washing for mud cake removal and other processes, and secondary damage to a reservoir can be avoided.