شبیه‌سازی یکپارچه‌ی جریان دو فاز در مخازن ترک‌دار طبیعی با روش ترک مجزای افزوده و پردازش تصاویر هوایی

نوع مقاله : پژوهشی

نویسندگان

دانشکده‌ی مهندسی مکانیک، دانشگاه صنعتی شریف، تهران، ایران.

چکیده

در نوشتار حاضر، یک فرآیند یکپارچه برای شبیه‌سازی جریان دو فاز در مخازن ترک‌دار طبیعی ارائه ‌شده است؛ که شامل دو بخش اصلی است: 1) تولید شبکه‌ی ترک‌ها از یک تصویر هوایی و اختصاص آن به سنگ مخزن، 2) شبیه‌سازی جریان در مخزن با کمک روش ترک مجزای افزوده. جزئیات پردازش تصویر و نحوه‌ی تشخیص هر ترک‌ تشریح و تأثیر پارامترهای مؤثر در کیفیت نتایج بررسی شده است. نتایج شبیه‌سازی با کمک یک مسئله‌ی نمونه، راستی‌آزمایی شده است. همچنین، تأثیر خواص فیزیکی سنگ و ترک‌ها در جریان گزارش شده است. نتایج نشان داده‌اند که در یک مخزن دو فازی حاوی آب و نفت، افزایش بازشدگی ترک‌ها از 15/0 به 21/0 میلی‌متر باعث کاهش 3 درصدی تولید نفت و افزایش نفوذپذیری سنگ از ۱ به ۲۰ میلی‌دارسی، باعث افزایش ۲۲ درصدی آن شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An Integrated Approach for Simulation of Two-Phase Flows in Naturally Fractured Reservoirs Using Embedded Discrete Fracture Model and Aerial Image Processing

نویسندگان [English]

  • Ali Heshmati
  • Mehrdad Taghizadeh Manzari
Department of Mechanical Engineering of Sharif University of Technology, Tehran, Iran.
چکیده [English]

This paper introduces an integrated approach for simulating two-phase flows in naturally fractured reservoirs. The proposed computational process comprises two key steps: 1) generating a representation of the fracture network from aerial images using image processing techniques, 2) conducting two-phase flow simulations using the Embedded Discrete Fracture Method (EDFM). The reservoir contains only oil and water as immiscible incompressible fluids, with the assumption that the fracture system matches surface outcrop observations. Python libraries are utilized for image processing to convert aerial images into a fracture system defined by line segments. The effect of various tuning parameters, such as image resolution and edge detection, on the final fracture model is investigated. Once a robust fracture system representation is achieved, the reservoir geometry is defined, and boundary conditions are set. The problem is solved using the MATLAB Reservoir Simulation Toolbox (MRST), which includes an EDFM module for accurate analysis of naturally fractured reservoirs by incorporating detailed information, yielding precise fluid flow predictions. All types of fracture-matrix and fracture-fracture intersections and fluid exchanges between matrix and fractures are incorporated in the EDFM. Simulation results are verified against a benchmark problem, and the influence of rock and fracture physical properties on the flow field is examined. The study finds that rock permeability significantly affects fluid flow compared to fracture aperture or permeability. For instance, a 3 percent decrease in oil production is observed when increasing fracture aperture from 0.15 (mm) to 0.21 (mm), while increasing the matrix permeability from 1 to 20 millidarcy leads to a 22 percent increase. 

کلیدواژه‌ها [English]

  • Natural fractured reservoirs
  • embedded discrete fracture model (EDFM)
  • image processing
  • two-phase flow
  • aerial imaging
  • outcrop

مراجع

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