ارزیابی نیروهای بین سطحی در حین تزریق مواد فعال سطحی آنیونی و کاتیونی به مخازن کربناته

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی شیمی و نفت، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

چکیده

در این مطالعه به بررسی تأثیر مواد فعال سطحی آنیونی و کاتیونی برروی افزایش برداشت نفت از طریق تغییر ترشوندگی سنگ مخرن و کاهش کشش بین سطحی پرداخته شده است. برای این منظور از ماده فعال سطحی AOS، آلفا اولفین سولفونات، به‌عنوان یک ماده فعال سطحی آنیونی و از CTAB، برمید ستریمونیوم، به‌عنوان یک ماده فعال سطحی کاتیونی استفاده شده است. در ابتدا پایداری محلول‌های شیمیایی با استفاده از آزمایش پتانسیل زتا بررسی گردید و محلول های پایدار جهت انجام آزمایش‌های کشش بین سطحی، ترشوندگی، سیلاب‌زنی، و جذب سطحی مواد فعال سطحی مورد استفاده قرار گرفتند. علاوه‌برآن، تحلیل نیروهای بین سطحی به منظور تعیین نقطه ایزوالکتریک و نقش آن در میزان جذب ماده فعال سطحی، مورد ارزیابی قرار گرفت. نتایج نشان می‌دهد که مواد فعال سطحی آنیونی و کاتیونی میزان کشش بین سطحی را در حد قابل توجهی کاهش می دهند. همچنین بیشترین تغییرات ترشوندگی سنگ مخزن مربوط به ماده فعال سطحی آنیونی است که ترشوندگی سنگ مخزن را از حالت به‌شدت نفت‌دوست (159o) به شرایط آب‌دوست (37o) تغییر می‌دهد. با توجه به تعیین نقطه ایزوالکتریک، میزان جذب برای ماده فعال سطحی آنیونی به مراتب بیشتر از ماده فعال سطحی کاتیونی خواهد بود. در مجموع آب دریا حاوی ماده فعال سطحی کاتیونی به‌دلیل عدم وجود پدیده Snap-off، میزان ضریب بازیافت نفت را در حدود 19%، نسبت به تزریق آب دریا بهبود می‌بخشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Surface Forces during Anionic and Cationic Surfactant Flooding in Carbonate Reservoirs

نویسندگان [English]

  • Sepideh Zeygham
  • Asghar Gandomkar
Department of Chemical and Petroleum Engineering, Shiraz Branch, Islamic Azad University, Iran
چکیده [English]

In this study, the effect of anionic and cationic surfactants on enhanced oil recovery was investigated by considering the wettability alteration and interfacial tension. The alpha olefin sulfonate (AOS) and cetrimonium bromide (CTAB) were considered as anionic and cationic surfactants respectively. Firstly, the stability of chemical solutions was evaluated by zeta potential test and so these solutions were used to IFT, wettability, coreflooding, and surfactant adsorption tests. Also, the surface forces were analyzed to investigate the isoelectric point and surfactant adsorption. The results show that the anionic and cationic surfactants can significantly reduce the interfacial tension. Also, the anionic surfactant alters the reservoir wettability from strongly oil wet (159o) to water wet (37o). Based on the isoelectric point, the anionic surfactant adsorption is higher than that for cationic surfactant adsorption. Consequently, the low salinity sea water which includes cationic surfactant, due to no snap-off phenomena, improved the oil recovery factor up to 19 % compared to sea water injection.
 

کلیدواژه‌ها [English]

  • Surfactant
  • Wettability
  • Chemical Stability
  • Iso-electric Point
  • Interaction Forces
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