Wettability regulating and controlling cross-linking agent, fracturing fluid and preparation and application methods of wetting property regulating and controlling cross-linking agent and fracturing fluid

The invention provides a wettability regulation and control cross-linking agent, fracturing fluid and preparation and application methods thereof, and the wettability regulation and control cross-linking agent comprises the following components in percentage by mass: 28-32% of organic boron, 0.7-0.9% of borax, 28-32% of a wetting agent, 0.4-0.6% of an emulsifier and the balance of water. The wettability regulation and control fracturing fluid comprises a base fluid and a wettability regulation and control cross-linking agent, wherein the mass ratio of the base fluid to the wettability regulation and control cross-linking agent is 100: (0.6-0.8). The fracturing fluid has the unique characteristics of wetting reversal, low-temperature gel breaking, low damage and high sand-carrying capacity, the damage of the fracturing fluid to the fracture permeability can be effectively reduced, and the fracturing transformation effect is improved. 本发明提供了一种润湿性调控交联剂、压裂液及其制备和应用方法，所述润湿性调控交联剂按质量百分比计，包括：有机硼28～32％、硼砂0.7～0.9％、润湿剂28