شیمى کاربردى روز

شیمى کاربردى روز

بررسی عملکرد میدان‌های الکتریکی برای بهبود بازیابی نفت خام

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
گروه شیمی کاربردی، دانشکده شیمی و علوم نفت، دانشگاه بوعلی سینا، همدان
چکیده
با افزایش مصرف نفت خام و کاهش منابع قابل استخراج، توسعه روش‌های نوین برای بهبود بازیابی نفت خام اهمیت ویژه‌ای یافته است. یکی از راهکارهای پیشرفته و مورد استفاده در سال‌های اخیر، به ‌کارگیری میدان‌های خارجی، به‌ویژه میدان الکتریکی برای کاهش نیروهای جاذبه بین نفت خام و آب است که منجر به افزایش تحرک نفت محبوس در مخازن می‌شود. در این پژوهش، تاثیر میدان‌های الکتریکی با ولتاژ در محدوده (V 9-3) و فرکانس در بازه (Hz 900-100) بر کشش بین ‌سطحی سیستم نفت خام-آب مورد بررسی قرار گرفت. نتایج نشان داد که این ویژگی وابستگی قابل توجهی به پارامترهای میدان الکتریکی دارد، که بیشترین ولتاژ و فرکانس تنظیم‌شده در مقدار بهینه، کشش بین ‌سطحی را از مقدار اولیه 0/32 به mN/m 8/8 کاهش داد که معادل 5/72% کاهش و نیز بهبود بازیابی نفت خام است. این پدیده عمدتا ناشی از افزایش جذب سطحی سورفکتانت‌های طبیعی نفت در فصل مشترک و ایجاد جریان‌های الکتروهیدرودینامیک می‌باشد. علاوه بر این، بررسی عملکرد میدان‌های الکتریکی نشان داد که میدان الکتریکی در فرکانس بهینه به دلیل جابه‌جایی مداوم قطب‌ها کارایی بیشتری دارد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Performance of Electric Fields for Enhanced Oil Recovery

نویسندگان English

Negin Ghaderi Hayati
Javad Saien
Farnaz Jafari
Department of Applied Chemistry, Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University, Hamedan, Iran
چکیده English

With the increase of crude oil consumption and the decrease in extractable resources, the development of new methods to enhanced oil recovery has become of particular concern. One advanced and exploited method in recent years is employing external fields, especially electric fields, to reduce the attraction forces between crude oil and water, which improves the production of oil trapped in reservoirs. In this study, the effects of different electric fields with voltage range of (3-9) V and frequency within (100-900) Hz on the interfacial tension of the crude oil–water system were investigated. The results showed that this property has a significant dependency on the electric field parameters, and that the highest voltage and the frequency adjusted at the optimum value, decreased it from the initial value of 32.0 to 8.8 mN/m, equivalent to a 72.5% reduction and also enhanced oil recovery. This phenomenon is mainly due to the increased adsorption of natural crude oil surfactants at the interface and the creation of electrohydrodynamic flows. In addition, investigations on the performance of electric fields demonstrated that electric field with optimum frequency exhibits higher efficiency attributed to the continuous displacement of the poles.

کلیدواژه‌ها English

Enhanced oil recovery
Electric field
Interfacial tension
Natural surfactants
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