Scientific Reports · 2024 · 25 citations · 26 references
EngineeringChemical EngineeringPetroleum EngineeringReservoir EngineeringReservoir OperationsReservoir SimulationGas InjectionWell Performance AnalysisAcid DiversionAcidizingEnhanced Gas RecoveryGas Recovery EfficiencyGelled SystemsHydrochloric Acid RemovalHydrochloric Acid TreatmentMatrix Acidizing
Matrix acidizing enhances well productivity by injecting acid to dissolve damage or create flow channels. The study introduces a groundbreaking three‑stage gas‑well acidizing approach using HCl and viscoelastic diverting acid (VDA) and aims to guide industry professionals in optimizing well productivity and gas recovery. The authors integrate VDA throughout laboratory experiments, simulation modeling, and operations, and use a numerical model to recommend an optimal acidizing method comprising five acid injection stages and five VDA injection stages. The combined HCl and VDA approach effectively dissolves reservoir materials, prevents emulsion and iron precipitation, reduces corrosion and H₂S emissions, enhances penetration depth and fluid flow channels, stimulates all reservoir layers, and yields a 100 % increase in gas production, an 84 % rise in gas pressure, and a reduction of BS&W from 7 % to 3 %.
Abstract This paper explores matrix acidizing, a method to enhance well productivity by injecting acid into the formation to dissolve damage or create flow channels. Focusing on gas well acidizing, it introduces a groundbreaking three-stage approach with hydrochloric acid (HCl) and viscoelastic diverting acid (VDA). Unlike recent research, which often overlooked specific VDA stages and favored VES or surfactant gelled systems, this study innovatively integrates VDA throughout laboratory experimentation, simulation modeling, and operational execution. The article showcases the effectiveness of HCl and VDA in dissolving reservoir materials, preventing issues like emulsion formation and iron precipitation, reducing corrosion and H2S emissions, enhancing penetration depth, fluid flow channels, and stimulating all reservoir layers. Utilizing a numerical model, it recommends an optimal acidizing method with five main acid injection stages and five VDA injection stages. The results demonstrate a notable increase of 100% in gas production, an 84% rise in gas pressure, and a reduction of BS&W from 7 to 3%. Aimed at industry professionals, this paper serves as a guide for optimizing well productivity and gas recovery processes.
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