A high temperature resistant cementing mud self-healing agent and its preparation method and application

Abstract

The invention relates to the technical field of oil drilling, and specifically discloses a high-temperature resistant cementing mud self-healing agent and a preparation method and application thereof. The self-healing agent comprises the following materials: 1) polyvinyl alcohol; 2) epoxy resin, wherein the molar ratio of the self-healing agent to the polyvinyl alcohol is 100:20 to 100:60; and 3) a catalyst, which is used to catalyze the chemical reaction between the polyvinyl alcohol and the epoxy resin. The invention selects polyvinyl alcohol, epoxy resin, catalyst and polyurethane prepolymer as preparation materials, thereby achieving chemical compatibility and reactivity between the materials. Then, through a specific molar ratio and mixing ratio, the materials can be effectively synthesized into a substance with self-healing performance in subsequent steps. The material selection and action mechanism improve the stability and self-healing ability of the self-healing agent in a high-temperature environment, and ensure its reliability and durability in cementing operations. Meanwhile, the cost of the materials is relatively controllable, which is conducive to industrial production and application.

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