تاثیر شرایط بارگذاری و تعداد گلوله خرج گود بر کارآیی مشبک کاری با گلوله‌ خرج گود

نوع مقاله : مقاله پژوهشی

نویسنده

گروه مهندسی معدن، مکانیک سنگ، دانشکده مهندسی معدن، دانشگاه صنعتی اصفهان، ایران

چکیده

عملیات مشبک‌کاری با خرج گود شامل ایجاد یک سوراخ در لوله جداری، سیمان پیرامون آن و سازند بهره‌ده به‌منظور ایجاد ارتباط بین مخزن و چاه نفت است. عوامل متعددی بر کارآیی و عمق نفوذ مشبک‌کاری تأثیرگذار است. در این میان نقش تنش سه‌محوره واقعی زمین، نوع بارگذاری و تعداد گلوله­‌ها بر روی کارآیی مشبک‌کاری به‌خوبی بررسی نشده است. بنابراین یک دستگاه بزرگ‌مقیاس جهت مشبک‌کاری نمونه­‌های بلوک تحت شرایط سه‌محوره واقعی طراحی و ساخته شد. در این مطالعه برای بهینه‌سازی تعداد آزمایش­‌های بزرگ‌مقیاس، از روش طرح آزمایش تاگوچی بهره‌مند شده و سهم هر کدام از تنش­‌های برجا بر روی عمق نفوذ با استفاده از تحلیل آماری نتایج، معین شد. آزمون­‌های این پژوهش، شرایط مشبک‌کاری در چاه­‌های عمودی و افقی در حوزه‌­های گسلش به ترتیب امتدادلغز و معکوس را شبیه‌سازی می­‌کند. نتایج نشان داد که عمق نفوذ در شرایط سطحی حداکثر است. تنش موازی با محور شلیک کمترین تأثیر را در کاهش عمق نفوذ دارد. عمق نفوذ گلوله در شرایط دوبعدی متناظر از حالت بارگذاری سه‌بعدی رایج بیشتر و هر دو آنها عمق نفوذ بیشتری نسبت به حالت بارگذاری سه محوره واقعی بدست می­‌دهند. در مشبک‌کاری با گان، عمق نفوذ گلوله اول از گلوله­‌های دوم و سوم با اختلاف زیادی کمتر است. شلیک گلوله باعث ایجاد یک سوراخ مشبک‌کاری و تعدادی ترک کششی در اطراف آن می­‌گردند. الگوی انتشار ترک­‌های کششی به نوع بارگذاری بستگی دارد. تعداد ترک­‌های کششی ایجاد شده در اطراف سوراخ مشبک‌کاری در سنگ آهک نسبت به بتن به مراتب بیشتر است. روند کاهش قطر در سوراخ اول نسبت به دوم متفاوت است.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of loading condition and the nmber of shaped charges on the perforation performane.

نویسنده [English]

  • Peyman Norouzi
Department of Mining Engineering (Rock Engineering), Faculty of Mining Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

The perforating operation with the shaped charged includes creating a hole in the casing, and the cement around it, and the production formation in order to create a connection between the reservoir and the oil well. Several factors affect the efficiency and depth of penetration of perforation. The role of the real triaxial stress, loading condition and the number of chaped chrages on the efficiency of perorating has not been well investigated. Therefore, a large-scale device for perforate block samples under real three-axis conditions was designed and made. In this study, in order to optimize the number of large-scale tests, the Taguchi test design method was used and the contribution of each of the insitu stresss on the penetration depth was determined using the statistical analysis of the results. The results simulate the conditions of n-situ stresses on vertical and horizontal wells in the fault zones, respectively, strike-slip and reverse. The results showed that the depth of penetration is maximum in surface conditions. The stress parallel to the firing axis has the least effect in reducing the depth of penetration. In the gun peroration, the penetration depth of the first charge is much lower than the second and third ones. The shaped charges made a hole and some tensile cracks around it. The propagation pattern of tensile cracks depends on loading condiion. The number of tensile cracks created around the hole in limestone is much higher than in concrete. The diameter rduction along the first & second hole is different.

کلیدواژه‌ها [English]

  • "Shaped Charge
  • Depth of Penetration
  • Loading Condition
  • True Triaxial stress
  • insitu stress"

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نشریه علمی ژئومکانیک نفت
دوره 5، شماره 4
بهمن 1401
صفحه 68-81

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