Addressing the escalating prevalence of gas-showing wells in CO2-flooded low-permeability reservoirs at the Mou Oilfield's periphery, where conventional pumping is untenable, alongside the challenges of costly pressurized operations and the problematic recycling of high-salinity, heavily emulsified, and solids-rich kill fluids, a novel solid-free kill fluid and an integrated recovery and reuse system have been innovatively developed to enhance operational safety. The formulated kill fluid comprises a synergistic blend of a weighting agent, corrosion inhibitor, gas invasion prevention enhancer, and a filtrate loss reducer. Rigorous indoor performance evaluation experiments were conducted. The findings indicate that the fluid's density is adjustable within a range of 1.0–2.0 g/cm3, maintaining a corrosion rate below 0.070 mm/a. Remarkably, it achieves a swelling prevention rate of up to 95.9% and an API fluid loss under 10 mL/30 min, even under demanding conditions of high temperature and pressure (4.1 MPa, 85 °C) following CO2 invasion. This fluid is characterized by its absence of solids, minimal corrosiveness, reduced filtrate loss, robust swelling prevention, and resistance to gas invasion, fulfilling the stringent requirements for kill fluids in CO2-flooded low-permeability reservoirs. The integrated recovery and reuse device utilizes an advanced physical purification process, encompassing electro-emulsion breaking and coagulation, electro-flotation for oil removal, dual-media adsorption, and porous membrane filtration.