بررسی آزمایشگاهی مکانیسم جابه‌جایی میکروسکوپی سیلاب‌زنی مواد فعال سطحی در شرایط شوری و دمای بالا

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده نفت اهواز، دانشگاه صنعت نفت، ایران

2 شرکت ملی مناطق نفت‌خیز جنوب، ایران

10.22078/pr.2019.3670.2675

چکیده

میزان حجم بالای نفت غیرقابل استحصال مخازن کربناته به روش‌های اولیه هدفی مهم برای به‌کارگیری روش‌های ازدیاد برداشت شیمیایی نفت است. اما شرایط خاص این‌گونه مخازن نظیر دمای بالا، تجانس ناپذیری نمک‌های موجود در آب سازند و آب دریا و همچنین، ترشوندگی نفت‌دوست این مخازن از جمله عواملی هستند که تولید مطلوب از آنها را با چالش جدی مواجه می‌کنند. لذا در این پژوهش به بررسی پایداری، روند کاهش کشش سطحی و تغییر ترشوندگی لایه نفتی در اثر سیلاب‌زنی با استفاده از دو نوع ماده فعال سطحی آنیونی DSS و SDBS و دو نوع ماده فعال سطحی کاتیونی CTAB و CPC پرداخته شده است. ضریب بازیافت حاصل در اثر استفاده از این مواد به‌ترتیب 63، 48، 44 و 35% مشاهده گردید که بیشترین ضریب بازیافت در اثر اعمال ماده فعال سطحی DSS به‌دست آمد. همچنین، به ‌منظور بررسی تغییر ترشوندگی در اثر حضور ماده فعال سطحی در محیط متخلخل، نمونه سنگ مخزن به‌مدت دو هفته نفت‌دوست گردید و با اندازه‌گیری زاویه تماس °160 شرایط نفت‌دوستی به اثبات رسید. روند تغییر ترشوندگی در اثر زمان‌دهی با استفاده از دو نوع ماده فعال سطحی آنیونی DSS و SDB و دو نوع ماده فعال سطحی کاتیونی CTAB و CPC بررسی شد. زوایای تماس به‌دست ‌آمده به‌ترتیب °100، °90، °60 و °7/48 بوده است. بیشترین تغییر ترشوندگی در اثر استفاده از CPC مشاهده گردید. این ماده توانسته است زاویه تماس را از °160 به °7/48 تغییر دهد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Experimental Investigation of the Microscopic Displacement Mechanisms of Surfactant Flooding in High Salinity and High Temperature Conditions

نویسندگان [English]

  • Sepideh Veiskarami 1
  • khalil shahbazi 1
  • saadat mohammadhosseinzadeh 2
1 Ahwaz Faculty of Petroleum, Petroleum University of Techrnology (PUT), Iran
2 National Iranian South Oil Company, Ahwaz, Iran
چکیده [English]

The high amount of trapped crude oil in carbonate reservoirs is the main objective of the various Enhanced Oil Recovery techniques. However, the harsh conditions of these reservoirs, such as high temperature, incompatibility of formation brine and sea water ions, as well as oil-wet conditions, are among the factors which face the desired approach with serious challenges. Therefore, in this study, the stability, interfacial tension, wettability alteration, and microvisual flooding experiments have been investigated using two types of anionic surfactants [DSS and SDBS] and two types of cationic surfactants [CTAB and CPC]. The amount of recovered oil was 63%, 48%, 44% and 35% respectively. The highest recovery factor was due to implementation of the DSS surfactant. Also, in order to investigate the effect of surfactant on the wettability alteration, the reservoir rock samples were aged for two weeks. Contact angle measurement of 160 degree has proved the oil wetness condition. Wettability alteration has been investigated using treating solutions of anionic surfactants DSS, SDB and cationic surfactants [CTAB and CPC]. Obtaining results demonstrate contact angles of 100, 90, 60 and 48.7 respectively. Finally, the highest wettability change is due to the application of CPC which alters the contact angle from 160 degrees to 48.7.
 

کلیدواژه‌ها [English]

  • Micro-model flooding
  • Surfactant
  • Rheology
  • Wettability Alteration
  • Contact Angle

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