Phenolic resin system cross-linking agent as well as preparation method and application thereof

The invention belongs to the technical field of preparation of plugging agents, and discloses a phenolic resin system cross-linking agent as well as a preparation method and application thereof. The phenolic resin system cross-linking agent comprises phenol, aldehyde, a catalyst, a stabilizer, an enhancer, a coagulant and water. Compared with a conventional phenolic resin cross-linking agent, the phenolic resin system cross-linking agent has the advantages that the storage time is as long as 4 months, no pungent smell exists, the toxicity is low, and the water plugging rate of a plugging agent prepared from the cross-linking agent reaches 90% or above; the oil plugging rate reaches 18% or below, and the plugging strength can reach 10 MPa/m; the low-temperature gel forming time is controlled to be 24-72 h, the gel forming strength reaches 10000 mPa.S or above, the gel forming stability can reach 6 months or above, the applicable temperature and concentration range is wider, and the profile control agent can be