پیش‌بینی ماسه‎دهی با استفاده از نگار‌های چاه در یکی از میادین نفتی جنوب ایران

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی معدن و متالوژی، دانشگاه صنعتی امیرکبیر، تهران

2 دانشکده مهندسی معدن، پردیس دانشکده‎های فنی، دانشگاه تهران

3 دانشکده مهندسی معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود

4 شرکت نفت و گاز اروندان، تهران

چکیده

ماسه‎دهی در خلال استخراج و بهره‎برداری از چاه‎های نفتی یکی از مشکلات بسیار مهم در به تأخیر انداختن عملیات بهره‎برداری است. روش‎های مختلفی برای پیش‌بینی ماسه‎دهی در درون چاه‌هایی که سنگ مخزن آن‎ها کربناته یا ماسه سنگی است، ارائه شده است. این روش‎ها معمولاً شامل آزمایشات مکانیک سنگ (مانند آزمایش مقاومت تراکمی تک محوره و یا سه محوره)، آزمایشات کانی‎شناسی و یا استفاده از نگارهای چاه است. آزمایشات مکانیک سنگ، آزمایشات کانی‎شناسی و یا آزمایشات دیگری که برای تجزیه و تحلیل چاه به‌کار می‎روند نسبت به نگارهای متداول چاه‎نگاری بسیار وقت‎گیر و هزینه‌بردار هستند. از این‌رو در مقاله حاضر، از نگارهای چاه برای پیش‎بینی ماسه‌دهی یکی از چاه‎های نفتی در جنوب ایران استفاده شده است. برای این منظور، با در اختیار داشتن نگارهای متداول پتروفیزیکی از جمله نگار صوتی، ابتدا مدول‎های الاستیک سنگ و مقاومت فشاری تک محوره و سپس مقدار فشار منفذی نیز محاسبه شده است و این مقادیر با مقادیر واقعی کالیبره گردید. از آن‌جایی که تعیین مقدار تنش‎های برجا در اعماق زیاد برای پیش‎بینی ماسه‎دهی چاه مورد مطالعه ضروری بود با در دست داشتن مقادیر به‌دست آمده از مدول‎های الاستیک، مقاومت فشاری تک محوره و فشار منفذی، تنش‎های برجای افقی و تنش عمودی محاسبه شد. در نهایت با استفاده از معیار شکست موهر-کلمب و نگار کالیپر، پنجره بهینه گل برای پیش‎بینی زون‎های دارای پتانسیل ماسه‌دهی، محاسبه شده است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Prediction of Sand Production Using Well Logs from Oil Fields in Southwest of Iran

نویسندگان [English]

  • Shahoo Maleki 1
  • ali Moradzadeh 2
  • Reza Ghavami Riabi 3
  • Farhad Sadeghzadeh 4
  • Ramin Mohammadi 1
1 Department of Mining and Metallurgy Engineering, Amirkabir University of Technology, Tehran
2 School of Mining Engineering, College of Engineering, University of Tehran
3 Faculty of Mining, Petroleum and Geophysics, Shahrood University of Technology
4 Drilling Division, Arvandan Oil field Company, Tehran
چکیده [English]

Sand production during extraction and exploitation from oil wells is one of the most important problems in delaying the exploiting operations. Different methods are presented to predict sand production in the field the reservoir rocks of which are sandstone or carbonates. This methods are typically comprised of rock mechanics tests (such as uniaxial compressive strength and triaxial tests), and mineralogical analyses or using of well logs. Rock mechanics tests and mineralogical analyses, as well as other tests used to analyze oil and gas wells, are very time consuming and costly in comparison with conventional well logs. Therefore, in this paper, well logs are used for the prediction of sand production in the southwest of Iran. For this purpose, by having traditional petrophysical logs such as sonic logs, the uniaxial compressive strength and elastic modulus in rocks are first calculated, and then the values of pore pressure are computed; these values are also calibrated with the real data. Since in situ stresses at deep depths are very necessary for the prediction of sand production, by using values obtained for elastic modulus, uniaxial compressive strength, and pore pressure, the vertical and horizontal stresses were obtained. Finally, Mohr-Columb criteria and caliper log data were used to obtain the optimum safe mud window for the prediction of local zones that have the potential of sand productions.
 

کلیدواژه‌ها [English]

  • Sand Production
  • Well Logs
  • Stress
  • Failure Criteria
  • Safe Mud Window
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