مطالعه آزمایشگاهی و عددی مسدودسازی انتخابی در ازدیاد برداشت میکروبی نفت در میکرومدل شیشه ای

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی نفت، دانشگاه صنعتی امیرکبیر، تهران، ایران

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

چکیده

یکی از مکانیسم‌های مؤثر ازدیاد برداشت میکروبی یا شیمیایی نفت، مسدودسازی انتخابی مسیرها و گلوگاه‌ها می‌باشد. در بخش آزمایشگاهی این پژوهش، ابتدا محلول آبی باکتری صاف شده رگ وان به درون میکرو مدل نا‌همگن اشباع از نفت تزریق شد. هدف عمده در این بخش، بررسی تأثیر سلول باکتری در بهبود سیلاب‌زنی و مقایسه آن با آب خالص بود. تزریق آب بدون باکتری منجر به بازیافت 41% نفت شد، درحالی‌که تزریق محلول باکتری رگ وان، بازیافت نهایی نفت را به 48% افزایش داد. در بخش شبیه‌سازی، از یک هندسه ناهمگن دو بعدی به‌عنوان محیط متخلخل استفاده شد. به منظور به‌دست آوردن توزیع سیالات آب-نفت معادلات نویر و استوکس در حالت ناپایا حل گردیدند. هندسه محاسباتی با استفاده از مش‌های مثلثی گسسته‌سازی گردید و آزمون استقلال از مش نشان داد که نتایج حاصله وابسته به اندازه مش‌ها نیستند. با استفاده ازهفت مدل مختلف، اثر مکانیزم مسدودسازی انتخابی در گلوگاه‌ها و مسیرها به‌دقت مورد بررسی قرار گرفت و مشاهده شد که توزیع سیالات در ابعاد حفرات کاملا وابسته به توزیع این گلوگاه‌ها و موانع می‌باشد. وجود انسدادهای انتخابی در میانه مسیر قطر اصلی ماتریکس مقدار نفت زیادی را در میانه مسیر به تله انداخت که منجر به کاهش بازیافت نهایی در مقایسه با مدل‌های دیگر شد. پس از انسداد مسیر قطری، سیال ترشونده به ناچار از مسیر‌های جانبی واقع در بالا و پایین ماتریکس خود را به خروجی رسانده و رخنه رخ می‌دهد. نشان داده شد که در تمام مدل‌ها، مقدار بازیافت نفت بعد از انسداد مسیرها و گلوگاه‌ها با تراوایی بالا در مقایسه با حالت عدم وجود انسداد افزایش یافت. مدل‌های شماره 2، 4 و 6 تقریبا به مقدار بازیافت یکسانی دست یافتند در حالی‌که توزیع سیالات در این مدل‌ها مختلف بود. نتایج به‌دست‌آمده از این تحقیق نشان داد که روش میدان فازی کاهن-هیلیارد می‌تواند به طور واقع بینانه تری حرکت آب و نفت در ابعاد حفرات را تحت مکانیزم مسدود سازی انتخابی پیش‌بینی کند.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental and Numerical Analysis of Selective Plugging during Microbial Enhanced Oil Recovery in a Glass Micromodel

نویسندگان [English]

  • Ehsan Sabooniha 1
  • Mohammad Reza Rokhforouz 2
  • Shahab Ayatollahi 2
1 Department of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran
2 Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
چکیده [English]

Selective plugging is one of the most effective mechanisms in microbial and chemical enhanced oil recoveries. In the experimental section, the water solution of purified Acinetobacter sp. and distilled water were injected to an oil saturated heterogeneous micromodel porous media. The main goal of this experiment was to examine the effect of water-bacteria cell solution in the water flooding performance and to compare it with pure water flooding. Pure water injection could expel oil by 41% while the bacterial solution injection was resulted in higher oil recovery, i.e. 7%  improvement. In the simulation section, a heterogeneous geometry was used as porous media. To obtain water and oil distribution, Navier-Stokes equations were solved in time-dependent mode. Computational domain was discretised using triangular meshes. Moreover, the mesh independency analysis showed that the results are not dependent to the size of meshes. Seven different models were constructed to evaluate the influences of selective plugging in our porous media’s throats and routes during this process; moreover, the results illustrated that pour size fluid distribution is strongly related to the plugging distribution. After plugging of main diameter, wetting fluid inevitably exits from sidelong routes located in top and bottom of the matrix. It was shown in each model that the oil recovery was increased after throats, and routes were plugged in comparison with no plug model. Models no. 2, 4, and 6 had almost the same recovery while fluid distribution was different. The obtained results showed that Cahn-Hilliard phase field method can accurately predict water-oil displacement on pore scale under the selective plugging mechanism.
 

کلیدواژه‌ها [English]

  • Bacteria Cell
  • Selective Plugging
  • Microbial Enhanced Oil Recovery
  • Micromodel

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