پیش بینی ترمودینامیکی تشکیل رسوبات سولفات باریم و استرانسیم در طرح های سیلابزنی آب درمخازن نفتی

نویسندگان

1 کارشناسی ارشد مهندسی شیمی، باشگاه پژوهشگران جوان و نخبگان، واحد شیراز، دانشگاه آزاد اسلامی، شیراز

2 کارشناسی ارشد، پژوهشگاه صنعت نفت تهران

3 دانشیار، پژوهشگاه صنعت نفت تهران

چکیده

امروزه عملیات بازیابی نفت در مخازن نفتی از طریق تزریق آب رویکرد اقتصادی مطلوبی دارد اما بازده این روش در اثر تشکیل رسوبات معدنی در حالت فوق اشباع کاهش می‌یابد. از این‌رو توجه و مطالعات بیشتر برای جلوگیری از مشکل تشکیل رسوب معدنی ضروری به نظر می‌رسد. در مطالعه حاضر، تشکیل رسوبات معدنی سولفات باریم و سولفات استرانسیم در طی عملیات تزریق آب در چند میدان نفتی مانند نصرت، سیری و فورتیس با استفاده از مدل ضریب فعالیت Extended UNIQUAC  مطالعه و پیش‌بینی شده است. با استناد به نتایج این مطالعه، مدل Extended UNIQUAC  با نتایج تجربی و میدانی به خوبی مطابقت دارد. هم‌چنین رسوب سولفات باریم و سولفات استرانسیم در میدان نفتی نصرت به ترکیب آب سازند و آب تزریقی (آب خلیج فارس) و شرایط عملیاتی بستگی دارد که می‌تواند باعث ایجاد مشکلاتی در تجهیزات سطحی و زیر سطحی در عملیات بهره‌برداری نفت شود. هرچند برای میدان نفتی سیری بر اساس آنالیز آب و اطلاعات شرایط عملیاتی، تشکیل رسوب سولفات باریم و سولفات استرانسیم قابل توجه نیست. در این مطالعه درجه حرارت برابر 50، 100 و 110 درجه سانتی‌گراد و هم‌چنین فشار برابر 135،  270  و 2465psi   است. مقدار غلظت املاح معدنی در نمونه آب سازند و آب تزریقی حداکثر 86900 میلی‌گرم بر لیتر بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Thermodynamic Prediction of Ba and Sr Sulphates Scale Formation in Water Flooding Projects in Oil Reservoirs

نویسندگان [English]

  • S.H. Hashemi 1
  • M. Dinmohammad 2
  • S.A. Mousavi Dehghani 3
1 M.Sc, Chemical Engineering Group, Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 M.Sc, Institute of Production and Recovery, RIPI, NIOC, P.O.Box: 14757-3311, West Blvd. of Azadi Sports Complex Tehran, Iran
3 Associate Professor, Institute of Production and Recovery, RIPI, NIOC, P.O.Box: 14757-3311, West Blvd. of Azadi Sports Complex Tehran, Iran
چکیده [English]

Nowadays, recovery operations in oil reservoirs through water injection have a favourable economic approach, but the efficiency of this method decreases due to the formation of mineral deposits in super saturation. In the present study, formation of mineral deposits of barium sulphate and strontium sulphate has been studied and predicted during water imbibition operation in several oil fields such as Nosrat and Siri, according to the Extended UNICQUAC activity factor model. Based on the results of this study, the Extended UNIQUAC model is well matched to experimental and field results. Also, the prediction of barium sulphate and strontium sulphate precipitation in Nosrat oilfield depends on the conditions and composition of formation water, injected water (Persian Gulf water) and operational conditions, which can cause problems in surface and sub-surface equipment in oil exploitation operations. But for the Siri oil field, based on the analysis of water and operational data, the precipitation of barium sulphate and strontium sulphate is not significant. In this study, the temperature is 50, 100 and 110 °C, and also the pressure is 135, 270 and 2465 psi. The concentration of mineral salts in the water sample and injection water was up to 86,900 mg / l.

کلیدواژه‌ها [English]

  • Mineral ion
  • Extended UNIQUAC Model
  • Water flooding Operations
  • Mineral Deposit Formation

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