Complex water-based deep-water disposal fluid

The invention discloses a complex water-based deep-water disposal fluid and relates to the technical field of oil-gas exploration. The complex water-based deep-water disposal fluid is a non-inorganic salt weighted complex water-based deep-water disposal fluid system for reservoir protection in the formation testing process in deep-water exploration well testing. The formula of the complex water-based deep-water disposal fluid mainly contains the following components in percentage by mass: 92.8-99.35% of complexing agent HWHL, 0.05-0.2% of deoxidant, 0.1-2.0% of bactericide and 0.5-5.0% of corrosion inhibitor. The complex water-based deep-water disposal fluid system has good rheological properties, water sensitivity resistance and water-locking resistance, high non-corrosibility, good compatibility with a preliminary working fluid, a non-reservoir interval disposal fluid and formation water, and also excellent reservoir protectiveness and self-back-displacement capability. In addition, the complex water-based deep-water disposal fluid also has an excellent effect in field application; the contradiction between gas hydrate inhibition and reservoir protection can be solved, the formation damage to the reservoir caused by the disposal fluid standing under the conditions of the temperature and the pressure of the reservoir for a long time can be greatly reduced, and the study gap of the deep-water disposal fluid can be filled.