بررسی آزمایشگاهی مکانیسم انحلال سنگ ضمن تزریق آب رقیق‌شده دریا در سنگ‌های کربناته

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده نفت اهواز، دانشگاه صنعت نفت، اهواز، ایران

2 شرکت شلمبرژر، ادمونتون، کانادا

10.22078/pr.2020.4159.2887

چکیده

حدوداً سه‌دهه از معرفی آب هوشمند جهت استفاده در افزایش تولید از مخازن نفتی می‌گذرد، اما همچنان برخی جنبه‌های استفاده از آب کم‌شور و رقیق‌شده دریا به‌خوبی شناخته و معرفی نشده است. مکانیسم‌های متعددی بر کارآیی ازدیاد برداشت از مخازن کربناته در روش تزریق آب کم‌شور معرفی شده‌اند. در این مطالعه، از تست‌های سیلاب‌زنی برای ارزیابی یکی از مکانیسم‌های حاکم بر این فرآیند، که اصطلاحاً مکانیسم انحلال سنگ (rock dissolution) گفته می‌شود، استفاده شده است. به‌طور دقیق‌تر آب دریا به‌عنوان گزینه حالت پایه (شاخص) و آب‌های 5 و 20 برابر رقیق‌شده دریا برای بررسی اثر شوری مورد استفاده قرار گرفتند. برای تولید نفت خام، به سنگ‌های واقعی مخزن، چندین برابر حجم فضای متخلخل سنگ از آب‌هایی که به‌عنوان سیال جابه‌جا کننده گزینش شده بودند، تزریق شد. شاخص‌هایی برای بررسی رخداد این مکانیسم در نظر گرفته شد از جمله تراوایی سنگ قبل و بعد از تزریق، ضریب برداشت به‌عنوان تابعی از زمان و درجه pH مربوط به سیال جابه‌جا کننده در خروجی پلاگ (مغزه). با بهره‌گیری از داده‌های توزیع فشار، برهم‌کنش سنگ و سیال به‌طور جزئی ارزیابی شد. مهم‌ترین نتیجه این مطالعه این است که میان رقیق‌سازی آب دریا و شدت فعالیت مکانیسم انحلال سنگ رابطه مستقیم وجود دارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Study of Rock Dissolution Mechanism During Diluted Sea Water Injection in Carbonate Reservoirs

نویسندگان [English]

  • Saman Mohammadi 1
  • Shahin Kord 1
  • Jamshid Moghadasi 1
  • Omid Mohammadzadeh 2
1 Ahwaz Faculty of Petroleum, Petroleum University of Technology, Iran
2 DBR Technology Centre – Schlumberger, Edmonton, AB, Canada
چکیده [English]

Three decades have passed since the introduction of smart water injection in carbonate rocks; however, use of diluted sea water (dSW) is still ambiguous.  Several mechanisms have been introduced in the literature for increased productivity of low salinity water injection.  In this study, coreflooding tests were conducted to analyze the importance of one of the contribution mechanisms, the so-called rock dissolution mechanism. We used sea water as the baseline injecting phase, along with two dSW solutions, 5 and 20 folds dilution ratios as the low salinity solutions. Moreover, several pore volumes of the displacing phase were injected into real reservoir core plugs to recover the oil content. The impact of rock dissolution on oil recovery was evaluated by measuring core plug permeabilities before and after the flood as well as recovery factor as a function of time, along with monitoring the pH of the displacing phase at the inlet and effluent.  The interaction of rock and fluid was closely monitored and analyzed by studying the injection pressure profiles. It was obtained that diluting the sea water intensified the rock dissolution. Finally, it was found out that this mechanism was absent when unprocessed sea water was used to recover the oil.
 

کلیدواژه‌ها [English]

  • Enhanced Oil Recovery (EOR)
  • Rock dissolution
  • pH increase
  • Smart Water
  • diluted Sea Water (dSW)
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