مدل‌سازی تزریق آب با شوری پایین همراه با پلیمر با استفاده از تئوری جریان‌های جزئی

نوع مقاله: مقاله شیمی

نویسندگان

دانشکده مهندسی نفت و گاز، دانشگاه صنعتی سهند تبریز

چکیده

بر اساس نتایج مثبتی که از تأثیر آب با شوری پایین در تولید نفت بدست آمده است، مطالعات مختلفی درباره امکان ترکیب این روش با سایر روش‌های ازدیاد برداشت انجام گرفته است. ترکیب آب با شوری پایین با محلول پلیمری می‌تواند یکی از روش‌های مؤثر در ازدیاد برداشت نفت باشد. با نگاهی به محدودیت‌ها و مزایای استفاده از هر روش، می‌توان به این نکته پی برد که ترکیب این دو روش می‌تواند هم-افزایی مطلوبی داشته باشد، بطوریکه حضور پلیمر سبب بهبود بازده جاروبزنی نفت شده و در عین حال حضور آب با شوری پایین سبب جذب کمتر پلیمر و نیز افزایش آب دوستی سطح سنگ می‌گردد. در این مقاله با استفاده از تئوری جریان‌های جزئی به بررسی عملکرد تزریق آب با شوری پایین همراه با پلیمر جهت ازدیاد برداشت نفت در سنگ‌های ماسه‌ای پرداخته شده است. همچنین عملکرد روش مذکور در مقایسه با تزریق آب با شوری بالا و نیز تزریق آب با شوری پایین مورد بررسی قرار گرفته است. نتایج مدل‌سازی‌ نشان می‌دهد که براساس شرایط مطالعه حاضر، بواسطه تزریق آب با شوری پایین همراه با پلیمر، زمان ‌رسوخ آب در چاه تولیدی تا حدود 75/0 حجم فضای خالی به تعویق افتاده است. همچنین میزان تولید نفت نیز در مقایسه با تزریق آب با شوری بالا از مقدار 38% به 77% پس از تزریق یک برابر حجم فضای خالی افزایش یافته است. براساس نمودارهای جریان جزئی، این افزایش برداشت نفت به دلیل رخداد دو جبهه جریانی مختلف در طول تزریق آب با شوری پایین همراه با پلیمر می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Modeling of Polymer Associated Low Salinity Waterflooding by Fractional Flow Theory

نویسندگان [English]

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

According to the positive results of low salinity water (LSW) flooding to recover incremental oil, different studies have been performed to investigate the combination of LSW and other enhanced oil recovery (EOR) methods. Combination of polymer flooding and LSW could be one of the most effective EOR methods. Taking into account the strength and weakness of each individual method, one can take advantage of the synergism between polymer and LSW: presence of polymer improves oil sweep efficiency and LSW decreases polymer adsorption and alters rock wettability to more water-wet. In this paper, we applied fractional flow theory to investigate the performance of polymer-associated low salinity water (LSP) flooding as an EOR method in sandstone reservoirs. Also, application of LSP flooding to recover incremental oil was compared to that of high and low salinity water flooding. The results showed that as LSP was injected into the given sandstone reservoir, there is a delay in water breakthrough time to as much as 0.75 PV. Also, oil recovery duet to the LSP injection increased from 38% to 77% as compared to high salinity water flooding after 1 PV injection. Fractional flow analyses showed that the incremental oil obtained by LSP is mainly due to the presence of two distinct water saturation shock front.

کلیدواژه‌ها [English]

  • Enhanced Oil Recovery
  • Low Salinity Water
  • Polymer
  • Fractional flow theory
 

 

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