تأثیر قوام‌دهنده پلیمری P-1-D در کنترل تحرک‌پذیری گاز دی‌اکسیدکربن در فرآیند ازدیاد برداشت نفت

نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 گروه مهندسی پلیمر، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

10.22078/pr.2020.3944.2798

چکیده

یکی از چالش‌های موجود در حین تزریق گاز، کنترل تحرک‌پذیری گاز است که به‌علت گرانروی پایین موجب میان شکنی زود هنگام و در نتیجه، کاهش راندمان جابه‌جایی نفت مخزن می‌شود. در این مطالعه سعی شده است که از قوام‌دهنده پلیمری P-1-D با وزن مولکولی پایین (g/mol 910) به منظور کنترل تحرک‌پذیری گاز دی‌اکسیدکربن در شرایط مخزن استفاده شود. قوام‌دهنده‌های پلیمری با وزن مولکولی پایین جهت حلالیت در گاز نیاز به‌کمک حلال ندارند که می‌تواند کاربرد آنها را در فرآیند ازدیاد برداشت میدانی، نسبت به قوام‌دهنده‌های پلیمری با وزن مولکولی بالا در اولویت قرار دهد. برای این منظور، ابتدا فشار نقطه ابری شدن جهت ایجاد شرایط تک فاز گاز و پلیمر محاسبه شد. سپس، تأثیر قوام‌دهنده پلیمری برروی گرانروی دی‌اکسیدکربن در غلظت‌های 5000، 10000، 30000، 50000، 80000 و ppm 100000  مورد بررسی قرار گرفت. در ادامه، تأثیر قوام‌دهنده پلیمری P-1-D برروی کشش بین سطحی مورد ارزیابی قرار گرفت. نتایج نشان داد که فشار نقطه ابری شدن برای گاز دی‌اکسیدکربن و قوام‌دهنده پلیمری با افزایش غلظت قوام‌دهنده کاهش می‌یابد و همگی کمتر از فشار مخزن است. همچنین، قوام‌دهنده پلیمری موجب افزایش گرانروی گاز دی‌اکسیدکربن به‌میزان 7/15 برابر در غلظت ppm 80000 شده است که موجب کنترل تحرک‌پذیری گاز تزریقی خواهد شد. علاوه‌بر این، استفاده از قوام‌دهنده پلیمری موجب کاهش کشش بین سطحی شده است به‌نحوی که در غلظت ppm 10000 گاز تزریقی شرایط امتزاجی را خواهد داشت.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of P-1-D Thickener on CO2 Mobility Control During Enhanced Oil Recovery

نویسندگان [English]

  • Nosaybeh Bashti 1
  • Asghar Gandomkar 1
  • Mehdi Sharif 2
1 Department of Chemical and Petroleum Engineering, Shiraz Branch, Islamic Azad University, Iran
2 Department of Polymer Engineering, Shiraz Branch, Islamic Azad University, Iran
چکیده [English]

The gas mobility control is one of the main challenges during gas injection. It causes early gas break through and decreases the sweep efficiency due to low viscosity. In this study, the small molecule thickener (P-1-D, MW=910 g/mol) was used to improve the CO2 mobility control at reservoir conditions. The small molecule thickener can dissolved in gas without any co-solvent. It leads to the small molecule thickeners which may be used to the EOR field application in comparison with high molecular thickeners. The cloud point pressures were calculated to ensure that the single phase condition has occurred between CO2 and gas thickener. In addition, the effect of gas thickener on CO2 viscosity was investigated for 5000, 10000, 30000, 50000, 80000, and 100000 ppm P-1-D concentrations. Moreover, the impact of P-1-D thickener on interfacial tension (IFT) was studied. The results illustrated that the cloud point pressure for gas and CO2 thickener decreased by increasing in P-1-D concentrations and all of these are below the reservoir pressure. Also, the gas thickener increased the CO2 viscosity 15.7 fold for 80000 ppm concentration which can improve the gas mobility control. Finally, the IFT decreased in presence of the gas thickener which can provide the miscibility condition for at least 10000 ppm concentration.
 

کلیدواژه‌ها [English]

  • Polymer Thickener
  • Gas Mobility
  • viscosity
  • Interfacial Tension (IFT)
  • Cloud Point Pressure
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