مهندسی گاز ایران
ارزیابی عملکرد عملیات اسیدکاری ماتریسی در یک مخزن گاز میعانی کربناته با استفاده از آنالیز چاه آزمایی دی‌کانولوشن و تفسیر نمودارهای تولید
نوع مقاله : مقاله ترویجی
نویسنده
انستیتو مهندسی نفت، پردیس دانشکده های فنی، دانشگاه تهران، تهران، ایران
چکیده
اسیدکاری ماتریسی یکی از مهمترین اقدامات برای افزایش و نگهداشت بهره‌دهی طولانی مدت چاه است. اسیدکاری ماتریسی چاه‌های انحرافی عمیق در مخازن هتروژنژ/ناهمگون یک کار چالش‌برانگیز است. بنابراین، ارزیابی عملکرد عملیات قبل و بعد از اسیدکاری اهمیت بسیار بسزایی دارد. این مطالعه تحلیل چاه‌آزمایی با استفاده از تکنیک دی-کانولوشن و همچنین آنالیز تست فشار گذرا مرسوم به همراه تفسیر داده‌های آزمایش سرچاهی و نمودارگیری تولید و برای ارزیابی عملکرد اسیدکاری ماتریسی و بهبود تحویل‌دهی چاه در یک مخزن گاز میعانی کربناته چندلایه‌ای را ارائه می‌کند. این ارزیابی می‌تواند برای بهینه‌سازی استراتژی عملیات ماتریسی در چاه‌های اطراف و متعاقب آن برای اجرای عملیات اصلاحی موثر در چاه‌های آتی مورد استفاده قرار گیرد. نتایج diagnosis results داده‌های آزمایش سطحی حاکی از عملیات موفقیت‌آمیز اسیدکاری ماتریسی می‌باشد و شاخص بهره‌دهی کل حدود سه برابر افزایش یافته است. علاوه بر این فشار جریانی سرچاهی حدود ۶۲۳ پام افزایش و میزان انداخت فشار به یک سوم (۱/۳) کاهش یافت. با بکارگیری مزیت برداشت و تفسیر نمودارهای تولید و تحلیل چاه‌آزمایی در سیستم‌های چندلایه، تحریک چاه عمدتاً عمیق‌ترین لایه مخزنی با بالاترین فشار را تحت تاثیر قرار داده بود. بنابراین ضریب پوسته نامطلوب لایه‌های مخزنی مختلف بطور یکنواخت برطرف نگردیده بود. این مهم بایستی در طراحی عملیات‌های اسیدکاری آتی در چاه‌های اطراف /مشابه مورد توجه قرار گیرد به نحوی که هدایت اسید در مخزن به سمت فواصل مخزنی که کمتر تحت تاثیر قرار گرفته‌اند کنترل گردد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Evaluation of Matrix Acidizing Job in a Layered Gas Condensate Carbonate Reservoir Using Deconvolution Analysis of Well Test Data Combined with Production Logging Data Interpretation
نویسنده [English]
- Roya Geravand
University of Tehran , Institute of Petroleum Engineering, Tehran, Iran
چکیده [English]
Acid matrix treatment is one of the key jobs to increase and maintain the long-term well productivity. Matrix acidizing of deep slanted wells in heterogeneous reservoirs is a challenging task. Thus, performance evaluation of pre- and post- stimulation job is of great importance. This study presents the analysis of well test data using deconvolution and also conventional pressure transient analysis (PTA), combined with the interpretation of surface well testing, data from production logging tool (PLT), and petrophysical logs to evaluate the performance of matrix acidizing and well deliverability improvement in a gas-condensate multi-layered carbonate reservoir. This evaluation can be used to optimize the acid matrix treatment strategy in offset wells and, consequently to perform an effective remediation in future wells. The diagnosis results using the surface data has indicated a successful acid matrix treatment job with having an improved total productivity index by a factor of three. Furthermore, it has shown that the wellhead flowing pressure has increased by 623 psi and drawdown has decreased to one third. Additionally, taking advantage of combining PLT and PTA analysis for multilayer systems, it has been found out that, the acid treatment has mostly affected the deepest reservoir layer with higher pressure. Hence, the unfavorable skin effect of different reservoir layers have not been removed uniformly, which needs to be considered in designing the future acid job for offset wells to control acid diversion in the reservoir towards less affected intervals.
کلیدواژه‌ها [English]
- Deconvolution
- Pressure Transient Analysis
- Production Logging
- Matrix-Acidizing
- Gas Condensate Carbonate Reservoirs
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