Composition, micro-nanofiber cleaning agent as well as preparation method and application of micro-nanofiber cleaning agent

The invention relates to a composition, a micro-nanofiber cleaning agent as well as a preparation method and application of the micro-nanofiber cleaning agent. The composition includes a first homopolymer grafted polyester microfiber, a second homopolymer grafted nanocellulose, and a cross-linking agent. The preparation method of the micro-nanofiber cleaning agent comprises the following steps: S1, reacting a raw material system containing the composition and a solvent to obtain a reactant containing the micro-nanofiber cleaning agent; and optionally, S2, the solvent contained in the reactant is removed, and the micro-nanofiber cleaning agent is obtained. The molecular weight of the micro-nano fiber cleaning agent is 60000 to 90000. The invention further discloses application of the micro-nano fiber cleaning agent in drilling fluid, especially application in drilling cutting cleaning agents. According to the micro-nanofiber cleaning agent, a'rod + fluff 'structure is designed by referring to a bionics method,