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A novel pore-fracture dual network modeling method considering dynamic cracking and its applications

Petroleum Research 2020年第2期5卷 164-169页

作者： Yukun Chen Kai Yan Jigang Zhang Runxi Leng Hongjie Cheng Xuhui Zhang Hongxian Liu Weifeng Lyu PetroChina Xinjiang Oilfield Research Institute of Exploration and DevelopmentKaramayXinjiang843000China College of Mechanical and Transportation Engineering China University of Petroleum(Beijing)Beijing102249China Institute of Mechanics Chinese Academy of SciencesBeijing100190China Department of Petroleum Engineering China University of Petroleum-Beijing at KaramayKaramayXinjiang834000China State Key Laboratory of Enhance Oil Recovery Research Institute of Petroleum Exploration and DevelopmentPetroChinaBeijing100083China

Unconventional reservoirs are normally characterized by dual porous media, which has both multi-scalepore and fracture structures, such as low permeability or tight oil reservoirs. The seepage characteristicsof such reservoirs is mainly determined by micro-fractures, but conventional laboratory experimentalmethods are difficult to measure it, which is attribute to the dynamic cracking of these *** emerging digital core technology in recent years can solve this problem by developing an accuratepore network model and a rational simulation approach. In this study, a novel pore-fracture dualnetwork model was established based on percolation theory. Fluid flow in the pore of two scales, microfracture and matrix pore, were considered, also with the impact of micro-fracture opening and closingduring flow. Some seepage characteristic parameters, such as fluid saturations, capillary pressure, relative permeabilities, displacement efficiency in different flow stage, can be predicted by proposedcalculating method. Through these work, seepage characteristics of dual porous media can be achieved.

关键词： pore-fracture dual network model Micro-fracture Dynamic cracking Digital core Dimensionless parameters Seepage characteristics

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