بررسی تأثیر ذرات رسوب سولفاته در تشکیل امولسیون آب- نفت در هنگام اختلاط آب هوشمند– آب سازند

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی شیمی، گروه مهندسی نفت، دانشگاه تربیت مدرس، تهران، ایران

چکیده

مهاجرت ذرات رسوب در طول سیلاب‌زنی با آب هوشمند، نقش مهمی در بهبود بازیافت نفت دارد. این مطالعه نشان می‌دهد اختلاط دو آب ناسازگار باعث تشکیل رسوب‌های سولفاته شده که افزایش نفت به این مخلوط منجر به تشکیل امولسیون نفت می‌شود. هدف از این مطالعه، بررسی نقش ذرات نامحلول در تشکیل امولسیون نفت و تأثیر آن در افزایش بازیافت نفت است. برای مطالعه این پدیده از سه نوع آب سازند با غلظت بالای یون‌های باریم، کلسیم و استرانسیم و نیز آب هوشمند با غلظت بالای یون سولفات استفاده شد. همچنین، برای بررسی شرایط تشکیل امولسیون از نفت خام و نفت مدل حاوی استئاریک اسید و هگزادسیل آمین استفاده شد. ترکیب نفت اولیه و شناور از طریق آنالیز طیف‌سنجی (UV) مورد بررسی قرار گرفت. در نهایت، تأثیر تشکیل امولسیون در محیط متخلخل مورد بررسی قرار گرفت. آزمایش‌ها نشان داد در اثر اختلاط آب‌های سازند و آب هوشمند رسوب‌های باریم سولفات، کلسیم سولفات و استرانسیم سولفات تشکیل می‌شوند. پس از افزایش نفت به آب‌نمک دارای ذرات رسوب مشاهده شد که میزان رسوب موجود در آب کاهش می‌یابد. همچنین، نتایج آنالیز طیف‌سنجی (UV) از نفت شناور نشان داد که میزان استئاریک اسید و هگزادسیل آمین موجود در فاز نفت کاهش یافته است. بنابراین این نتیجه حاصل شد که ذرات رسوب با اجزای قطبی نفت، امولسیون نفت در آب را تشکیل می‌دهند. مقایسه نتایج سیلاب‌زنی با آب‌های هوشمند بدون یون سولفات و حاوی یون سولفات نشان داد که ذرات رسوب با بستن برخی از منافذ و تشکیل امولسیون در محیط متخلخل باعث افزایش بازیافت نفت از 14% به 47% می‌شود.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the Effect of Sulfate Sediment Particles on Water-Oil Emulsion Formation when Mixing Smart Water-Formation Water

نویسندگان [English]

  • Amir Saeedi Dehaghani
  • Sina Alizadeh
Petroleum Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Precipitate migration during smart water injection plays a significant role in improving the oil recovery. This study showed that the process of mixing two incompatible water causes sulfate precipitate production while introducing oil to the combination results in an emulsion formation. The main objective of this study is to investigate the fine solids present in the water and their roles in emulsion formation and how they affect the oil recovery. Three types of formation water were used in this study. These 3 water types contained high concentrations of barium, calcium and strontium ions respectively. The smart water contains high concentration of sulfates. Moreover, crude oil and model oils (containing Stearic acid) were used in order to study the emulsion formation conditions. The composition of both primary oil and floating oil were studied using UV analyzing method. Finally, the effect of emulsion formation in porous media on oil recovery was studied. Experiments showed that mixing smart and formation water results in Barium, calcium and Strontium Sulfate precipitation. By introducing oil to the combination of the two water types, a reduction in the amount of precipitate was observed. Finally, the results, which were obtained by implementing UV, showed that amount of stearic acid and also the precipitates were decreased in the oil phase. Therefore, this must be due to the interaction among polar components of the oil phase and the precipitate fines, which it causes an emulsion formation. Water flooding using a smart water containing sulfate ion, and the one that does not contain sulfate, have shown that precipitates which have caused an emulsion formation increases the recovery factor from 14 to 47 percent.
 

کلیدواژه‌ها [English]

  • Formation Water
  • Smart Water
  • Sulfate Precipitates
  • Emulsion
  • Oil Recovery
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