نوع مقاله : پژوهشی
نویسندگان
تهران، پژوهشگاه صنعت نفت، پژوهشکده توسعه فناوریهای شیمیایی، پلیمری و پتروشیمی،
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Hypothesis: The hybrid polymer system of modified starch and sulfonated polyacrylamide (SPAM) in water-based drilling fluids, compared to natural starch, utilizes the synergistic effect of the two polymers to enhance thermal stability, maintain optimal rheological stability under HPHT conditions, and significantly minimize fluid loss by forming a compact, low-permeability filter cake.
Methods: In this study, a hybrid polymer system composed of sulfonated polyacrylamide (SPAM) and starch, in native and chemically modified forms, was investigated aiming to improve the drilling fluid performance.
Findings: Thermogravimetric analysis (TGA) revealed that the modified starch exhibited a significantly lower degradation rate compared to the native form, which is due to its compact crosslinked structure that enhances the thermal resistance. Rheological analysis demonstrated that the combination of modified starch and SPAM provided higher shear stability and exhibited a smaller viscosity drop after thermal aging, which indicates improved resistance of the polymer chains to mechanical and thermal degradation. The drilling fluid formulated with the modified starch-SPAM blend showed marked improvements in thermal and rheological stability. Filtration tests further confirmed its superior performance as the filter cake thickness reduced to approximately 2 mm, compared to the thicker and more irregular cakes formed in the formulations containing native starch. Additionally, the fluid loss (FL) reduced to 2.2 cc, which reflects the formation of a dense, uniform, and low-permeability filter cake, which is critical for effective wellbore sealing and fluid control. In fact, synergistic effects of the two polymers, in addition to improving the fluid’s physical and chemical properties, have increased its stability against harsh operational conditions.
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کلیدواژهها [English]
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