کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11026380 1666388 2019 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A fracture conductivity model for channel fracturing and its implementation with Discrete Element Method
ترجمه فارسی عنوان
مدل هدایت شکستگی برای شکستن کانال و اجرای آن با روش عنصر دیجیتال
کلمات کلیدی
شکستن کانال، ستون پروپاننت، هدایت شکستگی، بهینه سازی، روش عنصر گسسته،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
This paper introduces a new method to predict conductivity in channel fracturing by implementing analytical solution in Discrete Element Method (DEM). First, an analytical model for channel fracturing conductivity is proposed. Then, a DEM model calibrated by using experimental results is set up to investigate the deformation of proppant pillar. Finally, the analytical model of fracture conductivity is implemented in the DEM model to predict conductivity during fracture closing. Parametric analyses are carried out to understand the effects of four factors: proppant size combination, concentration, time ratio τ and elastic modulus to stress ratio λ. Conductivity generally decreases during fracture closing and increases with the increasing proppant size and proppant concentration. The ratio of the pulsing time of proppant laden fluid to the pulsing time of the clean fluid is the key parameter for the field operation. A large time ratio could enhance the pillar stability though it may lead to the damage of fracture conductivity. For given rock modulus, closing stress and proppant size, the optimal range of time ratio can be given as a guidance for field operation. The field application of channel fracturing in the Shengli Oilfield proves that the optimized range of time ratio τ based on the proposed theoretical model is valid. The porosity of proppant pillar first decreases due to compression and then increases during fracture closing period because of the breakdown of the proppant pillar and the resulted particle movement outward. This paper gives insights for understanding the channel fracture conductivity and provides a practical tool for the optimization of channel fracturing design in the field.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Petroleum Science and Engineering - Volume 172, January 2019, Pages 149-161
نویسندگان
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