ارزیابی تحلیلی فرایند تولید ماسه در چاه های نفت و گاز مخزن آسماری میدان اهواز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک سنگ، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

2 گروه آموزشی تونل و فضاهای زیرزمینی، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

3 گروه آموزشی مکانیک سنگ، دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

4 اداره مهندسی زمین شناسی، شرکت ملی مناطق نفتخیز جنوب

چکیده

به دلیل اهمیت مشکل تولید ماسه در مخازن هیدروکربوری ماسه‌‌سنگی، در این تحقیق به ارزیابی لایه‌های سازند آسماری میدان اهواز در چاه شماره 469 از منظر علل و ظرفیت بالقوه تولید ماسه و ارایه راهکار مناسب برای کاهش آن از دیدگاه ژئومکانیکی پرداخته شده است. ارزیابی، با استفاده از نرم‌افزار Techlog صورت گرفته است. پارامترهای مورد نیاز برای ساخت مدل ژئومکانیکی یک بعدی مخزن از داده‌های موجود برآورد شده‌اند. معیار شکست موهر-کلمب با در نظر گرفتن اثر مقیاس برای حفره‌های مشبک‌کاری شده (Perforated) در شرایط تنشی غیر هیدرواستاتیک در نظر گرفته شده است. پس از ساخت مدل یک بعدی، نمودار افت فشار بحرانی (CDDP) در دو حالت چاه باز (Open Hole) و با حفره مشبک‌کاری شده ترسیم شده و نواحی مستعد تولید ماسه مشخص شده‌اند. لایه M2 به دلیل سستی، تخلخل و تراوایی چندین برابری نسبت به دیگر لایه‌ها، به عنوان یکی از مستعدترین نواحی تولید ماسه برای تحلیل حساسیت روی پارامترهای موثر انتخاب شده و تحلیل حساسیت بر اساس هندسه چاه، قطر غالب دانه‌های ماسه، شرایط تنش‌های میدانی و ویژگی‌های حفره مشبک‌کاری شده صورت گرفته است. با اندازه قطر غالب 200 میکرون برای ماسه‌های سازندی در ناحیه محتمل برای تولید ماسه، تحلیل حساسیت در چاه باز و حفره مشبک‌کاری شده، به ترتیب، در عمق 2822 و 2837 متری صورت گرفته است. فشار بحرانی ته چاهی (CBHP) و فشار بحرانی مخزن (CRP) در حفره مشبک‌کاری شده در راستای تنش افقی حداکثر با قطر حفره 0/4 اینچ، به ترتیب، 1898 و 2735 و در راستای عمود بر آن با قطر حفره 0/3 اینچ، به ترتیب، 861 و 2115 پوند بر اینچ مربع برآورد شده‌اند. با تعریف و تعیین زوایای انحراف انتقالی (TDA)، انحراف ایمن حداقل (MSDA) و جهت حفره بحرانی (CPOA) از روی تحلیل‌های حساسیت، روش طراحی نوینی برای عملیات مشبک‌کاری در مخازن درگیر با پدیده تولید ماسه ارایه شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Analytical Evaluation of Sand Production Process for Oil and Gas Wells in the Asmari Reservoir of the Ahwaz Field

نویسندگان [English]

  • Ali Sheikholeslam 1
  • Seyed-Mohammad Esmaeil Jalali 2
  • Ahmad Ramezanzadeh 3
  • Hasan Shojaei 4
1 Department of Rock Mechanics, Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Semnan, Iran
2 Department of Tunnel and Underground Spaces, Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Semnan, Iran
3 Department of Rock Mechanics, Faculty of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Semnan, Iran
4 Department of Geological Engineering, National Iranian South Oilfields Company, Ahwaz, Khuzestan, Iran
چکیده [English]

Due to the significance of the sand production (SP) issue in sandstone hydrocarbon reservoirs, the main objective of this study is to evaluate the Asmari formation layers along well No. 469 in the Ahwaz hydrocarbon field in terms of SP causes and its potential capacity to provide suitable solutions for its reduction from a geomechanical perspective. The evaluation was carried out using the Techlog software. The required parameters for constructing a one-dimensional geomechanical reservoir model were estimated from available data. The Mohr-Coulomb failure criterion was adopted considering the scale effect for perforated cavities under non-hydrostatic stress conditions. After constructing the one-dimensional model, the Critical DrawDown Pressure (CDDP) curve was plotted for both open hole and perforation completions, and the susceptible SP zones were identified. The M2 layer was selected as one of the most susceptible zones for SP sensitivity analysis due to its low strength, porosity, and permeability compared to other layers. The sensitivity analysis was conducted based on well geometry, formation rock properties, field stress conditions, and perforated cavity characteristics. The analysis was performed at depths of 2822 and 2837 meters in the open hole and the perforation completions, respectively, with a dominant sand diameter of 200 microns in the potential SP zone. The Critical Bottom Hole Pressure (CBHP) and the Critical Reservoir Pressure (CRP) were estimated to be 1898 and 2735 pounds per square inch, respectively, in the maximum horizontal stress direction with a 0.4-inch perforation diameter and 861 and 2115 pounds per square inch, respectively, in the direction perpendicular to the maximum horizontal stress direction with a 0.3-inch perforation diameter. By defining and determining Transitional Deviation Angle (TDA), Minimum Safe Deviation Angle (MSDA), and Critical Perforation Orientation Angle (CPOA) based on sensitivity analyses, a novel design approach for perforation operations in sand-prone reservoirs has been introduced.

کلیدواژه‌ها [English]

  • Sand Production
  • Critical DrawDown Pressure
  • Asmari Reservoir
  • M2 layer
  • Unconsolidated Sand
  • Loose Sand
  • Techlog Software

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نشریه علمی ژئومکانیک نفت
دوره 6، شماره 4
دی 1402
صفحه 25-50

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