پژوهش نفت

پژوهش نفت

مطالعه آزمایشگاهی تشکیل هیدرات متان در محیط متخلخل سیلیسی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 انستیتو مهندسی نفت- دانشگاه تهران
2 گروه مهندسی نفت پردیس کیش دانشگاه تهران
3 دانشکده مهندسی شیمی دانشگاه تهران
DOI:10.22078/pr.2025.5733.3548
چکیده
تحقق تولید متان از سیستم حاوی هیدرات گازی با شرایط ایمن و اقتصادی مستلزم شناخت و درک اساسی از رفتار فیزیکی درگیر در فرآیند دینامیک تشکیل و تفکیک هیدرات متان در محیط‌های رسوبی است .در این مطالعه با طراحی یک دستگاه آزمایشگاهی، سنتیک تشکیل هیدرات متان در بستر محیط متخلخل سیلیسی با رویکرد آب اضافی در میادین دریایی شبیه‌سازی شد. همچنین با استفاده از محاسبات موازنه حجمی، مقدار کسر تبدیل متان طی مراحل مختلف تشکیل هیدرات و نیز مقدار اشباع فازها در رسوبات حاوی هیدرات بدست آمده است. بررسی نتایج نمودارهای تکامل دما و فشار در طول فرایند تشکیل هیدرات متان نشان داد شرایط تشکیل هیدرات برای نمونه‌های آزمایشگاهی با شرایط ترمودینامیکی حاکم مطابقت زیادی دارد. متناسب با دانه‌بندی ماسه‌های سیلیسی انتخابی، مقدار متوسط اشباع فاز هیدرات 5/32%، اشباع فاز آب 9/63% و اشباع فاز گاز 6/3% برای نمونه‌های آزمایشگاهی محقق گردید. همچنین میانگین کسر تبدیل متان به هیدرات برای نمونه‌های آزمایش مقدار 2/88% به‌دست آمده است. اختلاف در پاسخ‌های حرارتی سیستم در برخی موقعیت‌های قرارگیری ترموکوپل‌ها به توزیع و تشکیل غیر یکنواخت هیدرات متان در محیط متخلخل منتسب گردید. همچنین بررسی‌ها نشان داد مقدار دسترسی فازهای گاز و آب و نوع توزیع فاز هیدرات در محیط رسوبی از عوامل مهم کنترل‌کننده کسر تبدیل متان در نمونه‌های آزمایشی می‌باشد. شبیه‌سازی شرایط دما و فشار هیدرات گازی تشکیل شده در این مطالعه نیز مطابقت خوبی با مخازن هیدرات گازی در میادین دریایی داشته است.
کلیدواژه‌ها

عنوان مقاله English

Experimental Study of Methane Hydrate Formation in Silica Porous Medium

نویسندگان English

Ali Nakhaee 1
mostafa moradinejad 2
Ghodratollah Hashemi Motlagh 3
1 Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, IRAN
2 department of petroleum engineering, kish international campus, University of Tehran
3 School of Chemical Engineering, University of Tehran
چکیده English

Achieving methane production from a gas hydrate-containing system under safe and economic conditions requires a fundamental understanding of the physical behavior involved in the dynamic process of methane hydrate formation and separation in sedimentary environments. In this study, by designing a laboratory device, the kinetics of methane hydrate formation in a porous silica environment with an excess water approach in offshore fields were simulated. Also, using volume balance calculations, the methane conversion fraction during different stages of hydrate formation and the saturation of phases in hydrate-containing sediments were obtained. The results of the temperature and pressure evolution diagrams during the methane hydrate formation process showed that the hydrate formation conditions for laboratory samples are in great agreement with the prevailing thermodynamic conditions. In proportion to the selected silica sand grain size, the average saturation of the hydrate phase was 32.5%, the saturation of the water phase was 63.9%, and the saturation of the gas phase was 3.6% for laboratory samples. Furthermore, the average methane to hydrate conversion fraction for test samples was 88.2%. Moreover, the difference in the thermal responses of the system at some positions of the thermocouples was attributed to the non-uniform distribution and formation of methane hydrate in the porous medium. Also, the studies showed that the amount of access of gas and water phases and the type of distribution of the hydrate phase in the sedimentary medium are important factors controlling the methane conversion fraction in the experimental samples. The simulation of the temperature and pressure conditions of the gas hydrate formed in this study also had a good agreement with gas hydrate reservoirs in offshore fields.

کلیدواژه‌ها English

Methane hydrates
Porous silica medium
hydrate kinetic
methane conversion fraction
Phase saturation
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