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اخبار > بررسي بصري و شبيه سازي مكانيزم تزريق گاز در شرايط مخزن



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بررسي بصري و شبيه سازي مكانيزم تزريق گاز در شرايط مخزن

 

عنوان پايان نامه : بررسي بصري و شبيه سازي مكانيزم تزريق گاز در شرايط مخزن

 

دانشجو : بهنام محمودي ورنامخواستي                                         مقطع : كارشناسي ارشد

رشته تحصيلي : مهندسي نفت                                                    گرايش : مخازن

دانشگاه : صنعت نفت

استاد راهنما : دكتر رياض خراط

 

اهداف :

    در اين مطالعه عوامل موثر در ازدياد برداشت از طريق مكانيزم تزريق گاز در مخازن نفتي مورد بررسي قرار گرفته است .

 

 

ضرورت تحقيق :

 

       مقـايسه نتايجي كه از طريق آزمايشگاه بدست آمده با نرم افزار شبيه سازي در فرايند تزريق گاز با وجود افت فشار زياد در مخازن نفت و موفق بودن روش هاي جابجايي امتزاجي و غير امتزاجي مي توان ميزان برداشت نفت را بهبود بخشيد. به دليل وجود منابع سرشار گاز در ايران اين روش نسبت به تزريق سيالات ديگر مزيت دارد. در اين پروژه مكانيزم تزريق گاز در مقياس خلل و فرج ( Pore scale ) مخزن ، در آزمايشگاه بصورت بصري و با استفاده از ميكرومدل مورد بررسي قرار مي گيرد . در هر اجرا در نهايت ميزان نفت جابجا شده و نفت باقي مانده . در خلل و فرج مدل بصورت بصري قابل بررسي ميباشد همچنين نتايج اين پروسه توسط نرم افزار شبيه سازي ميشود و نتايج بدست آمده از طريق آزمايش با نتايج شبيه ساز كامپيوتري قابل بحث و بررسي ميباشد.

 

 

Abstract

Visual micromodel technology has been applied to investigate multiphase flow in porous media because it allows watching the fluid flow clearly under a microscopic scale. Displacement processes involving immiscible fluid have performed at the microstructure scale, i.e, the scale of grains and pores. By using micromodel the motion of fluids and menisci can be observed and investigated, at least qualitatively, in term of micro geometry and physical characteristic of the liquids, gases, and solids present. The results and finding from micromodel studies can be used to improve our understanding of microscopic as well as macroscopic behaviors of displacement process, and for modeling the flow mechanisms at larger scales. The ability to see the movement of fluid interface makes it possible to distinguish a variety of mechanisms that may all lead to similar production behavior. In this study the transparent homogeneous micrornodel has been used to study secondary gas injection and tertiary gas injection process. A tertiary gas injection process denotes the mobilization of waterflood residual oil by gas invasion, whereas; secondary gas injection denotes the displacement of a continuous oil phase by gas.

This dissertation arranged in six chapters. First one is allocated to introduction.

All parameters that effect gas injection process and visualization studies have been performed so far are discussed in chapter two as literature review and in chapter three the displacement and trapping mechanisms which are more efficient in immiscible gas injection process are reported. The finding from micromodel experiments and results of physics of fluid flow in porous media at the microscopic scale and also laboratory facilities are present in detail in chapter four. In chapter five CMG as powerful software described and used to create and simulate a model, by using experimental data and in real scale the same as micro model, in order to predict performance of the micromodel under gas injection process and also six sensitivity analysis, such as Effect of wettability, varies injection rates, heterogeneity, viscosity, capillary pressure and varies injection pressure are conducted in this part. Conclusions and recommendations are presented in last chapter of this study.


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