مدل‌سازی ژئومکانیکی و انتخاب لایه کاندید شکست هیدرولیکی در یک مخزن فشرده در جنوب غربی ایران- مطالعه موردی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، ژئوتکنیک، دانشکده فنی و مهندسی، دانشگاه خوارزمی، تهران، ایران

2 دانشکده زمین‌شناسی، دانشگاه زنجان، ایران

3 گروه مطالعات مخازن، پردیس توسعه صنایع بالادستی، پژوهشگاه صنعت نفت، تهران، ایران

چکیده

در این تحقیق، به بررسی پتانسیل شکست هیدرولیکی در مخزن بنگستان یکی از میادین بزرگ، واقع در جنوب غرب ایران پرداخته شده است. مخزن از نوع مخازن فشرده بوده و شکاف‌های طبیعی نیز دارد. شکاف‌زنی هیدرولیکی به‌عنوان یکی از استراتژی‌های توسعه این مخزن مطرح است. لذا لازم است به‌منظور ارزیابی عملیات شکست هیدرولیکی و اثر بخشی این روش در بهبود تولید مخزن، خواص ژئومکانیکی آن تعیین گردد. برای این منظور در این پژوهش در ابتدا مدل یک بعدی ژئومکانیکی مخزن ایجاد شد. برای مدل ژئومکانیکی از اطلاعات موجود برای چاه‌های میدان نفتی مورد مطالعه و روابط تجربی و ریاضی موجود استفاده گردید. با تعیین پارامترهای ژئومکانیکی مورد نیاز، در مرحله دوم تحقیق به‌منظور تعیین لایه کاندید برای عملیات شکست هیدرولیکی دارا بودن 1- میزان تخلخل مناسب، 2- تنش برجای کم، 3- میزان اشباع آب کم، 4- مقاومت فشاری تک محوری کم و 5- اختلاف زیاد میان تنش‌های افقی حداقل و حداکثر به‌عنوان معیار لایه کاندید تعیین گردید. براساس نتایج حاصله لایه 3 مخزن به‌عنوان لایه هدف جهت انجام عملیات شکست هیدرولیکی پیشنهاد گردید.
 

کلیدواژه‌ها


عنوان مقاله [English]

Prediction of Geomechanical Modeling and Selection of Hydraulic Fracturing Candidate Layer in a Tight Reservoir in SW Iran: A Case Study

نویسندگان [English]

  • farhad asemi 1
  • Afshin Zohdi 2
  • Mohammad Saboormaleki 3
1 Department of Civil Engineering, School of Engineering, Kharazmi University, Tehran, Iran
2 Department of Geology, University of Zanjan, Zanjan, Iran
3 Resivor engineering Division, Research Institute of Petroleum Industry, Tehran, Iran
چکیده [English]

This study aims to investigate the use of hydraulic fracturing in the Bangestan reservoir in one of the major fields, which is in southwest Iran. It is a tight reservoir with natural fractures. Because hydraulic fracturing is one of the reservoir development techniques, it is extremely critical to determine the in situ stresses in order to assess the effectiveness of this technique in enhancing the reservoir’s production. For this purpose, a one-dimensional geomechanical model of the reservoir was developed. Geomechanical modeling was created based on the data available from the studied oil field wells as well as pre-existing experimental and mathematical correlations. The following criteria were determined for the candidate layer for hydraulic fracturing operations in the second stage of the research after determining the required geomechanical parameters: (1) appropriate porosity, (2) low in situ stress, (3) low water saturation, (4) low uniaxial compressive strength, and (5) high difference between the minimum and maximum horizontal stresses. The results of this study led to the selection of layer 3 of the reservoir as the target layer for hydraulic fracturing.
 

کلیدواژه‌ها [English]

  • Hydraulic Fracturing
  • Geomechanical Modeling
  • Candidate Layer
  • In Situ Stress
  • Tight Reservoir
  • Bangestan Reservoir
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