The local low-permeability reservoir section of Banzhong North Gas Storage has the potential for strong water sensitivity and water locking damage, while the middle and high-permeability reservoir section has the potential for leakage risk and solid-phase particle invasion damage. The reservoir protection technology for well workover operations should focus on the leakage prevention ability, degradation ability, gas invasion prevention ability, and reservoir compatibility of the killing fluid. Firstly, potassium chloride is used as the base fluid for well killing, and by comparing the advantages and disadvantages of different thickeners, xanthan gum is ultimately selected. Based on viscosity, water loss, and suspension indicators, the dosage of xanthan gum is determined to be 0.4–0.5%. The dosage ratio of the temporary plugging agent obtained through orthogonal experiments is 1.5% ZC–1 + 0.5% −1.0% TBD-2. Test the thermal stability, chemical compatibility with the formation, and corrosiveness of the killing fluid. Under the condition of 100℃ or less, the system can keep good working condition, good thermal stability, good chemical compatibility with the formation, and can bear the pressure of 8.0 MPa in the leakage-prone horizon, and the corrosion rate of the formula is only 0.067 g/m2 h at 90 ℃, which is very small to the production equipment. The technology is working safely and smoothly in XXX well. The daily gas injection was 190,000 m3 after 1 day of production, and 310,000 m3 after 2 days, and the effect of leakage prevention and reservoir protection was remarkable.