تعیین پنجره ایمن وزن گل و مسیر بهینه حفاری سازند گدوان با استفاده از معیارهای شکست سنگ در یکی از میادین هیدروکربنی جنوب غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد زمین شناسی نفت، دانشگاه خوارزمی تهران

2 دانشیار، دانشکده علوم زمین، دانشگاه خوارزمی تهران، ایران

3 استادیار، گروه زمین شناسی نفت، مرکز اکتشاف و تولید، پژوهشکده صنعت نفت (RIPI)

4 دانشیار، دانشکده مهندسی معدن، دانشکدگان فنی، دانشگاه تهران

5 مربی، گروه زمین شناسی نفت، مرکز اکتشاف و تولید، پژوهشکده صنعت نفت (RIPI)،

چکیده

امروزه اقتصاد کشورهای حوزه خاورمیانه در گرو افزایش نرخ بهره‌برداری و تولید نفت خام می‌باشد. با درک این واقعیت که کشف میادین هیدروکربوری عظیم در آینده به ندرت رخ خواهد داد، از این رو برنامه‌ریزی شرکت‌های نفتی، تولید بهینه از میادین موجود می‌باشد. سازند گدوان یکی از مخازن مهم دشت آبادان محسوب می‌شود که از توالی‌های شیل و ماسه‌سنگ تشکیل شده‌است. حفر چاه‌های تولیدی در این سازند به دلیل ماهیت ضعیف توالی شیلی همواره یک چالش بوده است. بیش از ۹۰% مشکلات چاه در سازند گدوان ناشی از ناپایداری چاه است. از جمله این مشکلات می‌توان به ریزش چاه، تنگ‌شدگی و گیرکردن مته اشاره نمود که منجر به افزایش زمان غیرمولد (‏NPT) و هزینه‌های حفاری می‌شوند. هدف اصلی این پژوهش، ارزیابی پایداری چاهی واقع در یکی میادین جنوب‌غرب ایران بر اساس یک مدل ژئومکانیکی یک‌بعدی با استفاده از نگارهای چاه‌پیمایی می‌باشد. پس از ساخت مدل ژئومکانیکی یک‌بعدی، جهت ارزیابی پایداری چاه از معیارهای شکست موهر-کولمب و موگی-کولمب استفاده شد. با بررسی نتایج مشخص شد که معیار شکست موهر-کولمب، تخمین بهتری در مورد فشار ریزش ارائه می‌دهد. همچنین امتداد ریزش‌های شناسایی شده بر روی نگار تصویری، به صورت شمال‌غرب-جنوب‌شرق بوده، که نماینگر جهت تنش‌افقی حداقل می‌باشد. برطبق نتایج آنالیز حساسیت، جهت بهینه حفاری برای سازند گدوان، شمال‌غرب-جنوب‌شرق بوده و برای انجام حفاری قائم در این سازند مطابق با مدل ژئومکانیکی چاه مورد مطالعه، وزن گل ایمن برابر با LB/G 14/9 تخمین زده شد. نتایج حاصل از این مطالعه می‌تواند به عنوان یک مرجع برای تعیین پنجره وزن گل بهینه در برنامه‌ریزی چاه‌های آتی در این میدان برای مقابله با مشکلات پایداری حفاری استفاده شود.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of safe mud weight window and optimal drilling path in the Gadwan formation using rock failure criteria in one of the hydrocarbon fields in southwest Iran

نویسندگان [English]

  • Hossein jahan mohammadi 1
  • Hossein Mosaddeg 2
  • Mehran Azizzadeh 3
  • Hamid sarkheil 4
  • Mohammad mohammadnia 5
1 Master's degree in Petroleum Geology, Kharazmi University, Tehran
2 Associate Professor, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran
3 Assistant Professor, Petroleum Geology Dept., Center for Exploration & Production, Research Institute of Petroleum Industry (RIPI),
4 Associate Professor, School of Mining, College of Engineering, University of Tehran, Iran
5 Petroleum Geology Dept., Center for Exploration & Production, Research Institute of Petroleum Industry (RIPI),
چکیده [English]

Today, the economies of Middle Eastern countries rely heavily on increasing their crude oil production and exploitation rates. With the understanding that the discovery of large hydrocarbon fields will become increasingly rare in the future, oil companies' planning focuses on optimal production from existing fields. The Gadwan formation is one of the important reservoirs in the Abadan Plain, composed of shale and sandstone sequences. Drilling production wells in this formation has always been a challenge due to the weak nature of the shale sequence. More than 90% of the well problems in the Gadwan formation are due to wellbore instability, including collapse, narrowing, and sticking of the drill bit, resulting in increased non-productive time (NPT) and drilling costs. The main objective of this study is to evaluate the stability of a well located in southwestern Iranian oilfields using a one-dimensional geomechanical model based on well log data. After constructing a one-dimensional geomechanical model, the Mohr-Coulomb and Mogi-Coulomb criteria were used to evaluate wellbore stability. The results showed that the Mohr-Coulomb criterion provides a better estimate of collapse pressure. Furthermore, the orientation of the identified collapses on the image log was northwest-southeast, indicating the direction of minimum horizontal stress. According to the sensitivity analysis results, the optimal drilling direction for the Gadwan formation is northwest-southeast, and for vertical drilling in this formation, the safe mud weight estimated according to the well's geomechanical model is 14.9 pounds per gallon (LB/G). The results of this study can be used as a reference for determining the optimal mud weight window in planning future wells in this field to deal with drilling stability problems.

کلیدواژه‌ها [English]

  • Geomechanical model
  • wellbore instability
  • Gadwan Formation
  • Abadan plain
  • optimal drilling path

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نشریه علمی ژئومکانیک نفت
دوره 6، شماره 4
دی 1402
صفحه 61-80

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