مدل‎سازی اندرکنش بین آب با شوری پایین و ماسه‎سنگ از طریق کوپل‎کردن معادلات جریان سیال با مدل ژئوشیمیایی PHREEQC

نوع مقاله : مقاله پژوهشی

نویسندگان

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

چکیده

یکی از روش‌های ازدیاد برداشت نفت که اخیراً مورد توجه زیادی قرارگرفته است، تزریق آب با شوری پایین (LSW) است. بررسی مکانیسم‌های مرتبط با LSW نشان می‎دهد که واکنش‌های ژئوشیمیایی نقش موثری در تغییرات ترشوندگی سنگ و تولید نفت دارند. هدف این مقاله بررسی تأثیر واکنش‌های ژئوشیمیایی حل شدن کلسیت و مبادله یون برروی عملکرد LSW در یک مخزن ماسه‌سنگی با استفاده از مفهوم شوری آستانه است. بدین منظور، معادله جریان سیال براساس تئوری باکلی- لورت با نرم‌افزار ژئوشیمیایی PHREEQC کوپل شدند. نتایج نشان داد که در تزریق LSW، تعادل اولیه بین فاز آبی و سطح سنگ مخزن بر هم می‌خورد که این امر باعث انحلال کلسیت و نیز رخداد تبادل یونی بین فاز آبی و سطح سنگ می‎شود. آنالیز واکنش‌های ژئوشیمیایی در بلوک مجاور چاه تزریقی نشان داد که تبادل کاتیون‎ها می‎تواند سبب رهایش مواد نفتی از سطح سنگ شده که در نتیجه آن تغییر ترشوندگی به‎سمت آب‎دوستی بیشتر رخ خواهد داد. همچنین، پروفایل تغییرات pH در گستره مدل مخزنی نشان داد که سرعت انحلال کلسیت در فواصل نزدیک به چاه تزریقی با نرخ بالایی انجام می‎گیرد، اما در فواصل دورتر، صرفاً انحلال جزئی کلسیت به‎واسطه مکانسیم تبادل یونی رخ می‎دهد. آنالیز نمودارهای جریان جزئی همراستا با پروفایل شوری کل فاز آبی نشان داد که در طول تزریق LSW، دو جبهه جریانی مختلف در گستره مخزن ایجاد می‌شود: جبهه اول مربوط به جابه‎جایی آب با شوری بالا با میزان اشباع آب 43/0 و جبهه دوم مربوط به جابه‎جایی آب با شوری پایین با مقدار اشباع آب 58/0. این مقدار افزایش در اشباع فاز آبی بیانگر توانایی LSW در تولید نفت اضافی است که براساس شرایط این مطالعه و انتخاب شوری آستانه ppm 3000، افزایشی در حدود 10% از نفت اولیه مخزن است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Modeling the Interaction between Low Salinity Water and Sandstone Rock by Coupling Fluid Flow Equations with the PHREEQC Geochemical Model

نویسندگان [English]

  • Elham Kalantari
  • Mohammad Simjoo
Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

One of the enhanced oil recovery methods that has been recently received more attention is low salinity water injection (LSW). Among the proposed mechanisms to describe LSW, geochemical reactions seem to mainly affect rock wettability alteration and thus incremental oil recovery. The goal of this paper is to investigate the effect of geochemical reactions of calcite dissolution and ion exchange on the performance of LSW in a sandstone reservoir by using the concept of threshold salinity. Fluid flow equations according to Buckley-Leverett theory were numerically coupled with the PHREEQC software. Results showed that as LSW was injected, initial equilibrium between reservoir rock surface and aqueous phase was disturbed leading to calcite dissolution and also cation exchange between aqueous phase and rock surface. Analysis of geochemical reaction near the injection well showed that cation exchange may cause to separation of organic compound from rock surface leading to wettability alteration to more water- wet. Also, pH profile through the reservoir showed that rate of calcite dissolution was very high near injection well, but only partial dissolution of calcite induced by cation exchange occurs at farther distance. Fractional flow analyses in line with total salinity profile showed that two distinct saturation shock fronts were established during LSW injection: first one represents high salinity condition with a water saturation of 0.43, and the second one represents low salinity condition with a water saturation as much as 0.58. Under the conditions of this study and selection of a salinity threshold of 3000 ppm, such increase of water saturation reveals EOR potential of LSW by which an incremental oil recovery of 10% of the oil initially in place was obtained as compared to high salinity water injection.
 

کلیدواژه‌ها [English]

  • Low Salinity Water
  • Geochemical Reactions
  • PHREEQC
  • Wettability
  • EOR
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