مطالعه آزمایشگاهی اثر تزریق آب با شوری کم همراه با پلیمر بر تولید نفت سنگین

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی نفت و گاز، پژوهشکده نفت و گاز سهند، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

تزریق آب با شوری کم به‌عنوان یکی از روش‌های ازدیاد برداشت، در طول سال‌های اخیر مورد توجه محققان قرار گرفته است. استفاده از روش‌های دیگر همراه با تزریق آب با شوری کم نیز مورد بررسی و تحقیق قرار گرفته و روش‌هایی مانند تزریق آب با شوری کم همراه با مواد فعال سطحی یا پلیمر کارایی خود را در هرچه بیشتر کردن ضریب بازیافت نفت نشان داده است. در این مطالعه، با تزریق آب‌ با شوری کم همراه با پلیمر به پنج نوع مدل شن فشرده میزان تولید نفت و اثرات تزریق پلیمر و آب با شوری کم بر تولید نفت مورد بررسی قرارگرفته است. به همین منظور، سه آزمایش تزریق پلیمر به‌صورت مرحله سوم و دو آزمایش به‌صورت مرحله دوم انجام شده است. نتایج تزریق پلیمر به‌صورت مرحله دوم و مرحله سوم همراه با آب با شوری کم نشان می‌دهد که تزریق پلیمر در مرحله سوم، عملکرد بهتری را نسبت به تزریق مرحله دوم دارد و میزان بازیافت نفت تولیدی در نقطه‌ شکست حدود 11% بیشتر است. در حالت تزریق مرحله سوم با افزایش غلظت پلیمر تزریقی، بازیافت نفت با فعالیت سازوکارهای کاهش تحرک‌پذیری سیال جابه‌جاکننده‌ نفت و افزایش بازدهی میکروسکوپی، بیشتر می‌شود. در تزریق پلیمر به‌صورت مرحله دوم به‌دلیل تماس با آب بسیار شور سازند، میزان جذب سطحی پلیمر افزایش یافته و موجب کاهش تراوایی محیط متخلخل شده و بازیافت نفت کمتر می‌شود. آنالیز pH آب‌های تولیدی نیز نشان می‌دهند که در طول تزریق آب با شوری کم سازوکار افزایش pH فعال بوده و تغییر ترشوندگی به‌سمت آب‌دوستی، موجب افزایش بازیافت نفت می‌شود. در این مطالعه با استفاده از انداره‌گیری ضریب انکسار نوری آب‌های تولیدی که بیانگر چگونگی تغییر شوری آب می‌باشد، نحوه جابه‌جایی پلیمر و آب با شوری کم نیز مورد بررسی و تحلیل قرار گرفته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Study of the Effect of Combined Low Salinity Water and Polymer Injection on Heavy Oil Recovery

نویسندگان [English]

  • Seyed Mahdi Ghanizadeh
  • Elnaz Khodapanah
  • Seyyed Alireza Tabatabaei-Nezhad
Faculty of Petroleum and Natural Gas Engineering, Sahand Oil and Gas Research Institute (SOGRI), Sahand University of Technology, Tabriz, Iran
چکیده [English]

In recent years, low salinity polymer injection as an enhanced oil recovery method has drawn more attention by researchers. Combination of other methods with low salinity water injection has also been investigated in the literature. Among them is the combined low salinity water and surfactant or polymer injection which shows its efficiency in enhancing oil recovery. In this study, the combined low salinity water and polymer injection to five sandpack models and its efficiency in oil production is investigated through different flooding experiments. To this end, three and two polymer injection experiments were conducted in tertiary and secondary modes (after and before low salinity water injection), respectively. The results indicates that polymer injection in tertiary mode has better performance than the secondary mode injection experiments as in the former case the oil recovery at breakthrough is about 11% higher than the later one. In tertiary polymer injection experiments, as the concentration of polymer solution increases, the mobility of the displacing fluid decreases leading to an increase in the microscopic efficiency. During the secondary polymer injection, polymer is in contact with the high salinity formation water which increases the adsorption of polymer onto the rock surface and decreases the permeability of the porous medium. As a result, oil recovery decrease. The pH analysis of the produced water shows that during the low salinity water injection experiments, the pH increment is the active mechanism and the wettability alteration toward water-wet increases the oil recovery. Displacement of the polymer and low salinity water are also investigated by measuring the refractive index in the produced water indicating the trend of the salinity change.

کلیدواژه‌ها [English]

  • Low Salinity Water
  • Enhanced Oil Recovery
  • Polymer Injection
  • Recovery Factor
  • Heavy Oil
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