بررسی آزمایشگاهی اثر محیط اسیدی بر روی آب دریا و آب کم شور برای تغییر ترشوندگی و کاهش کشش بین سطحی: حضور کاتیون های دو و سه ظرفیتی

نوع مقاله : پژوهشی اصیل

نویسندگان

1 دانشجوی کارشناسی ارشد در دانشگاه تربیت مدرس

2 دانشیار گروه نفت دانشگاه تربیت مدرس

چکیده
موضوع تحقیق: در سال‌های اخیر، سیلاب زنی آب هوشمند به منظور ازدیاد برداشت نفت بسیار مورد توجه قرار گرفته است و یکی از مکانیزم های اصلی آن تغییر ترشوندگی است. با این حال، اثر حضور اسید بر عملکرد آب هوشمند همچنان مشخص نیست. به بیان دیگر، سوال اصلی این است که آیا حضور اسید در کنار یون های تعیین کننده می تواند به تغییر ترشوندگی بیشتر و کاهش کشش بین سطحی منجر شود.به علاوه، در این تحقیق برای اولین بار یون‌های سه ظرفیتی به آب هوشمند اضافه شد ونتایج بدست آمده از آزمایشات انجام شده با نتایج مربوط به یون‌های دو ظرفیتی مقایسه شد.

روش تحقیق: در این مطالعه آب دریا، آب دریای 4 برابر رقیق شده و آب دریای 8 برابر رقیق شده در آب مقطر و محلول های اسید کلریدریک 0.001 و 0.01 نرمال آماده شدند و آزمایشات کشش بین سطحی و زاویه تماس انجام شد. سپس، در آب دریای 8 برابر رقیق شده که در محلول اسید کلریدریک 0.01 نرمال آماده شده بود غلظت یون های
Ca2+، Mg2+ و Fe3+ تنظیم شد و تست‌های زاویه تماس و کشش بین سطحی انجام شد.

نتایج تحقیق: نتایج نشان داد که حضور اسید به تنهایی در آب مقطر اگرچه سبب کاهش کشش بین سطحی شد ولی زاویه تماس بسیار ناچیز کاهش یافت. همچنین، در صورت حضور اسید و یون های تعیین کننده، کشش بین سطحی کاهش قابل ملاحظه ای می کند که این به دلیل هم افزایی است که بین اسید و یون ها شکل می گیرد. اضافه شدن اسید به آب نمک با شوری مختلف توانست زاویه تماس را کاهش دهد ولی سطح شیشه همچنان نفت دوست باقی ماند. در مورد کاتیون‌های دو و سه ظرفیتی، نتایج نشان داد افزایش غلظت یون
Fe3+ در آب هوشمند سطح شیشه را آب دوست کرد اگرچه افزایش غلظت Ca2+ و Mg2+ منجر شد ترشوندگی از شرایط نفت دوست به شرایط خنثی تغییر کند. به علاوه، حضور یون های دو و سه ظرفتی رفتار مشابهی در کاهش کشش بین سطحی داشتند و با افزایش 4 برابری غلظت هر کدام از یون ها، کشش بین سطحی در حدود mN/m 2 کاهش یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental Investigation of Acidic Medium Effect on Seawater and Low Salinity Water for Wettability Alteration and Interfacial Tension Reduction: The Presence of Divalent and Trivalent Cations

نویسندگان English

nazanin parvizshahi 1
AmirHossein Saeedi Dehaghani 2
1 Master's Student at Tarbiat Modares University
2 Associate Professor of Petroleum Department, Tarbiat Modares University
چکیده English

Research Subject: In recent years, smart water flooding has gained attention regarding enhanced oil recovery, and one of its driving mechanisms is wettability alteration. However, the effect of acid presence on smart water performance needs to be clarified. Thus, the main question is whether the presence of acid and potential determining ions can lead to further wettability alteration and interfacial tension (IFT) reduction. Additionally, in this study, trivalent cations were added to smart water for the first time, and the results were compared with those of divalent cations.

Research approach: In this study, seawater (SW), 4-times diluted SW, and 8-times diluted SW were prepared in distilled water, 0.001 normal HCl and 0.01 normal HCl, and the contact angle and IFT experiments were carried out. In addition, concentrations of Ca2+, Mg2+, and Fe3+ were adjusted in 8-times diluted SW prepared in 0.01 normal HCl, and the IFT and contact angle tests were conducted.

Main Results: The results showed that the presence of acid in distilled water could decrease the IFT values; however, it did have a marginal effect on contact angle reduction. Also, because of synergistic effects between acid and potential determining ions, IFT significantly declined. While adding acid to brines with different salinities resulted in contact angle reduction, the glass surface remained oil-wet. Regarding divalent and trivalent cations, the results revealed that increasing Fe3+ concentration in smart water made the glass surface water-wet. However, adjusting Ca2+ and Mg2+ concentrations changed the wettability from oil-wet to neutral-wet. Moreover, divalent and trivalent cations showed similar behavior in IFT reduction, and a four-times increase in the concentration of each mentioned ion reduced IFT by about 2 mN/m.

کلیدواژه‌ها English

Smart water
Acid
Interfacial tension
Wettability alteration
Trivalent cation
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