بررسی اثر حلالیت ترکیبات نفت خام در آب بر ترشوندگی سطح نفت‌دوست کلسیت در فرآیند تزریق آب کم شور

نوع مقاله: مقاله پژوهشی

نویسندگان

انستیتو مهندسی نفت، پردیس دانشکده‌های فنی، دانشگاه تهران، ایران

10.22078/pr.2019.3562.2630

چکیده

اثر شوری و ترکیب یونی آب تزریقی در تغییر ترشوندگی مخازنکربناته به‌صورت گسترده‌ای درسال‌های اخیر مورد مطالعه قرار گرفته‌است. در این بین اثرات آب نمک تزریقی بدون در نظر گرفتن حلالیت ترکیبات آمفیفیلیکی نفت در آب بررسی شده است. دراین راستا، در این مطالعه سعی شده است تا اثر حلالیت ترکیبات آمفیفیلیکی نفت خام در آب بر ترشوندگی سطح نفت‌دوست کلسیت، در کنار نمک‌های کلرید منیزیم و کلریدکلسیم مورد بررسی قرار گیرد. بر همین اساس، آب‌ مقطر به همراه آب نمک‌های کلرید منیزیم و کلرید کلسیم در قدرت یونی 5/0 مولار در تماس با نفت‌خام قرار داده شدند تا به صورت اشباع از ترکیبات آمفیفیلیکی درآیند. بررسی اثر این ترکیبات بر روی خواص آب‌های درتماس، توسط آزمایشات pH و مقدار کربن آلی کل (TOC) انجام شد. در ادامه اثر این ترکیبات بر ترشوندگی سطوح نفت‌دوست شده کلسیت با در تماس قرار دادن این سطوح با دو گروه از نمونه آّب‌های اشباع از ترکیبات نفتی (درتماس با نفت‌خام) و خالص (بدون تماس با نفت خام) با استفاده از اندازه‌گیری زاویه تماس قطره نفتی مورد مطالعه قرار گرفتند. نتایج نشان داد مقدار کمی از ترکیبات بازی و اسیدی نفت خام در آب حل می شوند که در این بین سهم ترکیبات اسیدی بیشتر بود. همچنین بررسی سطوح در تماس با این نمونه آب‌ها نشان می‌دهد تغییرات ترشوندگی در هر دو گروه از نمونه آب‌های اشباع و خالص به سمت آب‌دوستی پیش می‌رود. به طوری که تغییرات ترشوندگی در نمونه‌های در تماس با آب خالص در مقایسه با نمونه آب‌های اشباع بیشتر و چشمگیرتر می‌باشد. نتایج نشان می‌دهد در کنار حضور ترکیبات محلول در آب، وجود ترکیبات یونی مشابه با ترکیبات سازنده سنگ در آب نیز در جلوگیری از تغییرات ترشوندگی موثر می‌باشند. بر همین اساس تغییرات ترشوندگی سطوح در تماس با آب نمک کلرید کلسیم در هر دو گروه اشباع و خالص نسبت به سایر نمونه آب‌ها کم و در حالت اشباع کمتر می‌باشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

he Effect of Water-Soluble Compounds of Crude Oil on Wettability of Oil-Wet Calcite Surface in Low Salinity Water Injection

نویسندگان [English]

  • mohsen bahaloo horeh
  • salman ghorbanizadeh
  • behzad rostami
institute of petroleum engineering, faculty of chemical engineering, Tehran university, Tehran, Iran
چکیده [English]

The impact of brine salinity and ion composition on wettability alteration of carbonate reservoir has been studied extensively in recent years. In these researches, the effect of salt water without considering the water-soluble amphiphilic compounds of crude oil has been investigated. In this study, the effect of water-soluble amphiphilic compound of crude oil beside ionic composition of MgCl2 and CaCl2 salt, on wettability alteration of oil-wet calcite surface were investigated. In this turn, distilled water and salt water of MgCl2 and CaCl2 with ionic strength of 0.5 molar were contacted to the crude oil for two weeks to be saturated with crude oil amphiphilic compounds. The effect of these compounds on water properties are examined with pH and total organic carbon (TOC) tests. In the next step, the effect of these compounds on wettability alteration of oil-wet calcite surface were investigated with exposing the oil-wet surfaces to the saturated and pure (without contact with crude oil) water samples and measuring the contact angle of oil droplet. The obtained results show that a low amount of acidic and basic compounds of crude oil (with higher portion of acidic compounds) were dissolved in contacted waters. The wettability of both surfaces which exposed to the pure and saturated waters changed toward water-wet. However, the changes in the presence of pure waters are much more than saturated waters. The results reveal that as well as water-soluble amphiphilic compounds the presence of similar rock composition ions in water can prevent the wettability alteration. In this turn, the wettability alteration of surfaces exposed to the CaCl2 salt waters (in both group of waters) were low and in saturated water was lower.
 

کلیدواژه‌ها [English]

  • Wettability Alteration
  • calcite surface
  • salt water
  • Crude Oil
  • amphiphilic compounds

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