مطالعه آزمایشگاهی سیلاب‌زنی آب هوشمند در یکی از مخازن کربناته جنوب کشور

نوع مقاله : مقاله پژوهشی

نویسندگان

مهندسی نفت، دانشگاه آزاد اسلامی، امیدیه، ایران

10.22078/pr.2021.4267.2930

چکیده

بخش بزرگی از سنگ‌های مخزن را سنگ‌های کربناته تشکیل می‌دهند که دارای پیچیدگی فراوانی هستند. مهم‌ترین چالش در بهره‌‌برداری نفت از مخازن کربناته که سبب کاهش میزان بازیافت نهایی نفت‌ خام می‌شود، باقی‌‌ماندن مقدار زیادی از نفت درون سنگ است. تکنیک‌های ازدیاد برداشت نفت نقش به‌سزایی در بهبود تولید نفت دارند. تزریق آب هوشمند به مخزن نفتی یکی از روش‌های جدید ازدیاد برداشت نفت است که با تنظیم و بهینه‌سازی ترکیب یون‌ها در آب تزریقی طراحی می‌شود. تزریق آب هوشمند به مخازن نفتی به‌دلیل هزینه کم نسبت به سایر روش‌های ازدیاد برداشت در صنعت نفت کاربرد زیادی دارد.هدف این مطالعه استفاده مناسب‌تر از روش تزریق آب برای افزایش راندمان تولید نفت از مخازن کربناته است. لذا در این تحقیق به بررسی آزمایشگاهی تأثیر غلظت‌های یون‌های منیزیم، سولفات و کلسیم در فرآیند ازدیاد برداشت به‌روش تزریق آب هوشمند برروی ضریب بازیافت نفت از سنگ کربناته پرداخته می‌شود. با مقایسه ضریب بازیافت ضریب بازیافت، "آب دوبار تقطیر شده" و "آب‌های حاوی یون‌های دو ظرفیتی" مشخص شد که حضور یون‌های دو ظرفیتی تأثیر مثبتی برروی ضریب بازیافت نفت از مخازن کربناته دارد. در ضمن با تغییر غلظت یون‌های دو ظرفیتی در آب‌های هوشمند طراحی شده در این مطالعه مشخص شد که افزایش غلظت منیزیم، سولفات و کلسیم باعث افزایش ضریب بازیافت نفت می‌شود. با مقایسه میزان ضریب بازیافت نهایی نفت مربوط به آب‌های هوشمند 4، 5 و 6 نسبت به آب هوشمند 3 مشخص شد که افزایش غلظت یون‌های Mg+2 و SO4-2 و Ca+2 باعث افزایش میزان ضریب بازیافت نهایی نفت به‌ترتیب از 55% به 7/57، 56 و 59% در سنگ‌های کربناته می‌شوند. به‌عبارت دیگر، افزایش غلظت یون کلسیم بیشترین تأثیر را برروی بازده نهایی نفت تولیدی و افزایش غلظت یون سولفات کمترین تأثیر را برروی بازده نفت تولیدی داشته است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Labrador Study and Optimization of Smart Water Flooding in South Carbonate Reservoir

نویسندگان [English]

  • Amirabbas Falipour
  • naser akhlaghi
  • Ronak Parvaneh
Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Iran
چکیده [English]

 
A large part of reservoir rocks is composed of carbonate rocks, which are more complicate. The most important challenge in oil production form the carbonate reservoirs, which decreased the ultimate oil recovery is that a great volume of oil remains in the rock. Enhanced oil recovery (EOR) techniques play an important role in improving oil production. Injecting smart water into the oil reservoir is one of the new methods of increasing oil extraction, which is designed by adjusting and optimizing the composition of ions in the injected water. Smart water injection into oil reservoirs is widely used in the oil industry due to its low cost compared to other methods of EOR. Generally, the objective of this study is better utilization of water flooding methods to increase the oil recovery efficiency from the carbonate reservoirs. Therefore, in this research, the effect of magnesium, sulfate and calcium ion concentrations in the process of enhanced oil recovery by smart water injection method on oil recovery coefficient from carbonate rock is investigated. By comparing the recovery factors for the double-distilled water and water types containing divalent ions, it was found out that the presence of divalent ions has a positive effect on the ultimate recovery from the carbonate reservoirs. In addition, changing the divalent ion concentrations in the designed smart water proved that an increase in the concentration of magnesium, sulfate, and calcium promotes the oil recovery factor. By comparing the final oil recovery coefficient of smart waters 4, 5 and 6 compared to smart water 3, it was found that by increasing of ions concentration of  Mg+2, SO4-2 and Ca+2 increase of the final oil recovery coefficient from 55%, 57.7%, 56% and 59% are in carbonate rocks, respectively. In other words, increasing the concentration of calcium ions had the greatest effect on oil recovery factor and increasing the concentration of sulfate ions had the least effect on the oil recovery factor.
 

کلیدواژه‌ها [English]

  • Smart Water
  • Carbonate Reservoirs
  • ultimate oil recovery
  • enhanced recovery
  • water flooding
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