مطالعه شبیه‌سازی تزریق فوم به مخازن شکاف‌دار با رویکرد تجربی: بررسی اثر ترشوندگی ماتریس بر عملکرد فوم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 انستیتو مهندسی نفت، دانشکده مهندسی شیمی، پردیس دانشکده‌های فنی، دانشگاه تهران، ایران

2 پژوهشکده مهندسی نفت، پردیس پژوهش و توسعه صنایع بالادستی نفت، پژوهشگاه صنعت نفت، تهران، ایران

10.22078/pr.2022.4637.3085

چکیده

تزریق گاز به عنوان یک ازدیاد برداشت نفت مورد استفاده می‌باشد. این روش اما به دلیل گرانروی پایین گاز و ناهمگونی مخازن با ضریب بازیافت پایینی همراه است. تزریق فوم به عنوان یک روش برای اصلاح تحرک‌پذیری گاز پیشنهاد و مورد استفاده قرار گرفته است. در این مطالعه، شبیه‌سازی اثر ترشوندگی محیط متخلخل بر رفتار فوم بررسی شده است. بر همین اساس، یک مدل شکاف‌دار ساخته و ترشوندگی محیط ماتریس آن مورد تغییرات قرار گرفته است. برای افزایش دقت شبیه‌سازی‌ها، مدل فوم متفاوتی به شکاف و ماتریس اختصاص یافته است. مدل‌های اختصاص یافته از آزمایش‌هایی نزدیک به محیط متخلخل بوده، چه از نوع محیط و چه میزان تراوایی، بوده است. پارامترهای فوم در شکاف، از یک الگوریتم بهینه‌سازی برمبنای پارامترهای شکاف حاصل شده است. نتایج شبیه‌سازی‌ها نشان می‌دهد که ایجاد فوم در محیط متخلخل سبب ایجاد یک جریان گرانرو بین شکاف و ماتریس شده که در نهایت سبب می‌شود فوم به داخل ماتریس وارد شده و نفت بیشتر تولید شود. در قیاس با تزریق مجزای گاز و در عدم حضور نیروی ریزش ثقلی، تزریق فوم می‌تواند تا حدود 70% سبب افزایش تولید نفت شود. به علت گرانروی مناسب فوم در داخل شکاف، میزان تغییرات ضریب بازیافت در حضور فوم با گرانروی‌های مختلف کمتر از 5% بوده که نشان از عدم ضرورت ایجاد فوم با گرانروی‌‌های بالا برای افزایش ضریب بازیافت می‌باشد. ترشوندگی ماتریس نوع کیفیت فوم را تعیین می‌کند و هرچه میزان ترشوندگی از آب‌دوست به ترشوندگی مخلوط برود، فوم ساختاری پایه آبی پیدا می‌کند. حضور نیروی موئینه نیز می‌تواند سبب ایجاد یک جریان گرانرو موئینه شده و به راندمان اثربخشی تزریق فوم آسیب بزند.
 

کلیدواژه‌ها


عنوان مقاله [English]

Simulation Study of Foam Injection into Fractured Reservoirs using an Empirical Approach: Investigation of Matrix Wettability Effect on the Foam Performance

نویسندگان [English]

  • Ali Saei 1
  • Maryam Khosravi 2
1 Institute of Petroleum Engineering, Faculty of Chemical Engineering, College of Engineering, University of Tehran, Iran
2 Petroleum Engineering Research Division, Faculty of Research and Development in Upstream Petroleum Industry (FRDUPI), Research Institute of Petroleum Industry (RIPI), Tehran, Iran
چکیده [English]

Gas injection has been used as an enhance oil recovery (EOR) method over last decades. However, due to low viscosity of gas and reservoir heterogeneity, this method has low recovery factor. Foam injection has been introduced as a solution to decrease gas mobility, and improve the ultimate oil recovery. In this study, the impact of wettability and capillary pressure on the foam performance has been investigated. In this regard, a fractured reservoir is developed, and three different wettability and capillary pressure condition has been tested. These conditions are changing the wettability from water-wet to mixed wet, along with an assumption of considering the capillary pressure or not. For better accuracy, different foam models were devoted to fracture and matrix. These models are similar to porous medium, and foam model parameters are a result of an optimization algorithm. The simulation outcomes reveal that the generation of foam within the fracture creates a viscous crossflow which leads to displacement of oil and higher recovery factors. The wetting state of the matrix determines the quality of foam, and matrix foam becomes more water-base, as wettability is altered from water-wet to mixed-wet. The results also show that matrix capillary pressure can create a capillary crossflow and harms the efficiency of foam injection by drying out foam in the fracture.
 

کلیدواژه‌ها [English]

  • foam injection
  • Fractured Reservoirs
  • Simulation
  • Wettability
  • Viscous Crossflow
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