اثر شوری آب و حضور ذرات ماسه بر ناپایداری آسفالتین در روش ازدیاد برداشت نفت با آب کم شور

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی شیمی و نفت، دانشگاه صنعتی شریف، تهران، ایران

چکیده

تزریق آب کم شور یا مهندسی‌شده به‌عنوان یکی از روش‌های ازدیاد برداشت نفت از میادین کربناته ایران و جهان موردتوجه می‌باشد. در کنار مزایای متعدد آن، ارزیابی ریسک‌های جانبی مانند آسیب سازند در اثر احتمال ناپایداری و رسوب آسفالتین نیز حائز اهمیت است. تاکنون پژوهش‌های انجام‌شده در این خصوص، منحصراً معطوف به بررسی تعامل نفت-آب بوده و تأثیر حضور سنگ به‌عنوان یکی از پارامترهای مهم بررسی نشده است. بنابراین در این پژوهش برای نزدیک‌تر کردن تست‌های آزمایشگاهی به شرایط مخزن، با ایجاد تماس بین آب/نفت/ماسه‌سنگ و اندازه‌گیری میزان جذب اشعه ماورای بنفش توسط نفت جداشده از امولسیون‌ها، میزان رسوب آسفالتین در حضور آب‌های شور مختلف اندازه‌گیری شد. برای اولین بار دستورالعمل انجام این‌گونه آزمایش‌ها به‌روش "غیرمستقیم" توسعه داده شد. نتایج این آزمایش‌ها نشان می‌دهد که میزان رسوب آسفالتین رفتاری غیر یکنوا با شوری دارد و در شوری‌های پایین افزایش داشته و در شوری‌های بالا، کاهش می‌یابد. نتایج همچنین نشان می‌دهد که در حضور آب دریای دو بار رقیق‌شده رسوب آسفالتین بیشتری در مقایسه با سایر آب‌ها ایجاد می‌شود. با اضافه شدن ماسه‌سنگ به سیستم به دلیل ایجاد سطح فیزیکی جدید برای نشست آسفالتین و اثر نیروهای الکترواستاتیکی میزان رسوب آسفالتین افزایش می‌یابد. با بررسی ماسه‌سنگ‌های جداشده از امولسیون مشاهده می‌شود که با افزایش شوری آب میزان رسوب آسفالتین برروی ماسه‌سنگ نیز افزایش‌یافته و آب‌شور سازند باعث ایجاد بیشترین میزان رسوب برروی ماسه‌سنگ (بیشتر از µg 4/1 بر گرم سنگ) می‌شود. نتایج این آزمایش‌ها به درک نقش حضور ماسه‌سنگ در ناپایداری آسفالتین در تزریق آب کم شور در میادین نفتی می‌انجامد و امکان تعیین دقیق‌تر میزان چالش رسوب آسفالتین در شرایط واقعی‌تری را به دست می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Salinity and Sand Particles Presence on Asphaltene Instability during Low-salinity Waterflooding

نویسندگان [English]

  • Amirhossein Salari
  • Hasan Mahani
  • Seyed Shahabodin Ayatollahi
Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
چکیده [English]

Low-salinity or engineered salinity waterflooding is one of the enhanced oil recovery methods, particularly for the carbonate fields in Iran and around the world. Alongside its numerous benefits, evaluating the side effects such as formation damage due to asphaltene instability and deposition is of paramount importance. Until now, research in this area has primarily focused on the investigation of oil-brine interactions, neglecting the influence of the presence of rock as an essential parameter. Therefore, in this paper, to bring the laboratory tests closer to reservoir conditions, the effect of rock presence was examined by creating contact between brine/fluid/sandstone grains and measuring the UV absorption of bulk oil before and after contact with rock and brine. In this regard, a new “indirect” procedure was developed through which the amount of asphaltene deposition in the presence of various brines was determined. Our results indicate that asphaltene deposition follows a non-monotonic trend with salinity, such that it increases at low salinities and decreases at high salinities, and reaches a minimum value at a middle salinity. The results also show that in the presence of two times diluted seawater, more asphaltene deposition occurs compared to other brines. Adding sandstone particles to the oil-brine system increases the amount of asphaltene deposition due to the creation of a new physical surface for asphaltene adsorption due to the influence of electrostatic forces. Detailed examination of the sand particles reveals that the higher the brine salinity, the higher the asphaltene deposition occurs on the particles; with formation brine leading to the highest asphaltene deposition on the particles (over 1.4 micrograms per gram sand). Ultimately, these experimental results contribute to the understanding of the role of sandstone particles on asphaltene instability during low-salinity waterflooding and provide a more accurate way of evaluating asphaltene deposition at more realistic conditions.

کلیدواژه‌ها [English]

  • Asphaltene Precipitation
  • Sandstone Particles
  • Enhanced Oil Recovery
  • Low Salinity Waterflooding
  • Uv Spectroscopy
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