بررسی و ارزیابی میزان تأثیرگذاری محلول کلریدی کربناته بر کشش بین سطحی دینامیک نفت خام اسیدی

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی شیمی، آزمایشگاه ازدیادبرداشت نفت و فرآوری گاز، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

امروزه از تزریق آب کربناته به عنوان یکی از روش ‏های پیشنهادی مؤثر در فرایند ازدیاد برداشت نفت از مخازن نفت خام نام برده می شود. در این روش، اثر ۲CO، دما و فشار روی کشش بین سطحی دینامیک (DIFT) نفت خام/آب شور کربناته از اهمیت ویژه‏ای برخوردار می باشد. در این پژوهش‌، با به‌کارگیری نمونه نفت خام اسیدی با عدد اسیدیته کلی g/mgKOH  5/1 و در حضور محلول سدیم کلرید کربناته و کلرید پتاسیم کربناته اثرهای هر یک از پارامترهای ذکر شده بر DIFT در بازه گسترده‌ای از دما (C°‏ 30-80) و فشار (psi‏ ۵۰۰-4000) مورد بررسی قرار می‏ گیرد. علاوه بر آن زمان جذب سورفکتانت‏ های طبیعی در نفت خام یعنی آسفالتین و رزین بر روی فصل مشترک، مربوط به محلول آبی کربناته/ نفت خام با استفاده از یک مدل تجربی نزولی نمایی (Mono-Exponential Decay) محاسبه و نتیجه‌های به دست آمده شامل کشش بین سطحی و زمان جذب با نتیجه‌های به‌دست آمده در غیاب دی­اکسید‏کربن یعنی محلول‏ های سدیم کلرید و کلرید پتاسیم و نفت خام مقایسه شده است. طبق نتیجه‌های به دست آمده، با افزایش فشار، با وجود کاهش اندک کشش بین سطحی تعادلی نفت خام/آب نمک کربناته، در روند DIFT تغییرهای چندانی مشاهده نشده است. در محلول‏ های کربناته با افزایش دما به دلیل افزایش جنبش مولکولی (افزایش آنتروپی)، کشش بین سطحی تعادلی (EIFT) کاهش داشته است. اما در حالت کلی، مشاهده شد که حضور ۲CO در فاز آبی باعث افزایش EIFT  در مقایسه با آب نمک خالص شده است؛ که می‏ توان آن را به ساختار اسیدی نفت خام وکاهش pH  فاز آبی و همچنین کاهش یونیده سورفکتانت­ های طبیعی نسبت داد.

کلیدواژه‌ها

موضوعات

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