Wall fixing agent for drilling fluid as well as preparation method and application of wall fixing agent

The invention provides a wall fixing agent for drilling fluid as well as a preparation method and application of the wall fixing agent and belongs to the technical field of drilling fluid. The wall fixing agent for the drilling fluid is prepared from the following raw materials in parts by weight: 10 to 25 parts of acrylamide; 10 to 25 parts of an adhesive; 10 to 25 parts of dimethyl diallyl ammonium chloride; 1 to 5 parts of acrylic acid; 1 to 5 parts of 2-acrylamide-2-methylpropanesulfonic acid; 1 to 5 parts of a chain transfer agent; 2 to 5 parts of an initiator; 5 to 12 parts of sodium hydroxide; and 80 to 100 parts of distilled water. According to the wall fixing agent provided by the invention, the strength of well wall rock is improved by enhancing cohesive force and adhesive forceamong rock particles, so that the anti-collapse performance of the drilling fluid is improved. Particularly, the hydration force and the like of the shale during hydration expansion can be weakened orcompletely counteracted b