Optimization and Performance Evaluation of Foam Acid Systems for Plugging Removal in Low Pressure Oil and Gas Reservoirs

Foam acidization has unique advantages such as low damage, filtration, friction, high efficiency, excellent retardation, and fast liquid discharge rate, which is suitable for stimulation reconstruction of low-pressure oil gas reservoirs that have been developed over many years. It obtained the main chemical components downhole plugging materials include vegetable oil, fatty acids their esters, silicone amide polymers, additional organic components, well non-organic elemental sulfur, ferrous sulfide, iron disulfide, silicon dioxide, mineral salts, etc. The performance foam acid was investigated by experiments, including effective range action active acids, reducing increasing temperature resistance high-temperature stability deep wells. new system optimized to acidification operations. Experimental evaluation foaming agent stabilizer a formulation with stability, filter loss reduction, resistance, easy backflow performance. experimental condition 90 °C, quality can reach more than 70% when mixed 30 s, average half-life 38.75 min, separation rate 19.90 s/mL. Its suspension better conventional hydrochloric acid, its corrosion 1.872 g/m2·h, flowback residue reaches 97%. shown features surface activity, stable foam, strong significant speed suppression, drainage assist Dynamical simulation reservoir core demonstrated long-life, capacity, rheology, plug removal effects, be used in stimulating medium-deep, high-temperature, reservoirs.