نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شیراز

2 دانشگاه امیرکبیر

3 دانشگاه شریف

چکیده

رفتار جابجایی نفت و میزان به دام افتادن آن در ناحیه اطراف چاه توسط سیال پیش شوی فرآیند اسیدکاری حایز اهمیت است. در این مطالعه، رفتار ویسکوز و موئینگی جریان دو فازی در مقیاس منفذی با استفاده از روش دینامیک سیالات محاسباتی مورد تجزیه و تحلیل قرار گرفته است. در این کار یک مدل دو بعدی، بر اساس معادلات میدان فازی کان هیلیارد و ناویر استوکس، ایجاد و با استفاده از روش اجزای محدود حل شد. با توجه به اهمیت نیروهای حاکم در این جابجایی، نمودار فازی براساس عدد موئینگی و نسبت ویسکوزیته تهیه و سپس با کارهای تجربی گزارش شده قبلی مقایسه گردید. پس از شناسایی حداکثر و حداقل دامنه عدد موئینگی (Nc) و نسبت ویسکوزیته (M)، پایدارترین منطقه جابجایی در Log M ≈ 0.5 و Log Nc ≈ -2 قرار گرفت. علاوه بر این، تاثیر چهار متغیر مستقل شامل حجم تزریق  (5>1>PV)، عدد موئینگی (0>Log Nc<-6)، نسبت ویسکوزیته (20.95) در Log M> 0 و 1 π/6 و
(2->Log Nc<-4.5) اتفاق می افتد. شایان ذکر است که برای Log M<0، شرایط بهینه در Log M ≈ 0، Log Nc ≈ -3.5، PV ≈ 4 و θ ≈ π/6 رخ می دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Using Computational Fluid Dynamics for Determining the Optimum Pre-flush Fluid Injection Condition During Matrix Acidizing

نویسندگان [English]

  • Meisam Mohammadzadeh Shirazi 1
  • Ehsan Sabooniha 2
  • Alireza Kazemi 2
  • Shahab Ayatollahi 3

چکیده [English]

Optimum oil displacement is the most important goal of pre-flush stage during matrix acidizing. In this study, the visco-capillary behavior of the two-phase flow in the pore-scale is analyzed using computational fluid dynamics. A two-dimensional model, based on Cahn–Hilliard phase-field and Navier–Stokes equations, was established and solved using the finite element method. To recognize the effective forces of two-phase flow displacement, a stability phase diagram based on the Logarithm of capillary number (Nc) versus the Logarithm of viscosity ratio (M) was constructed and then compared with the reported experimental data. After identifying both viscous fingering and capillary fingering regions, the most stable displacement region was found to be located at Log M ≈ 0.5 and Log Nc ≈ -2. Furthermore, the impact of four independent variables that critically affect the efficiency of the pre-flush stage, including pore volume of injection (1<PV<5), capillary number (-60.95) occurred at Log M > 0, -4.5 1, and θ> π/6 conditions. It is worth mentioning that for Log M< 0, the optimum condition occurred at Log M ≈ 0, Log Nc ≈ -3.5, PV ≈ 4 and θ ≈ π/6.

کلیدواژه‌ها [English]

  • Acidizing
  • Pre-flush fluid
  • Computational fluid dynamic
  • Sensitivity analysis
  • Capillary number
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