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

作　　者：Yukun Chen Kai Yan Jigang Zhang Runxi Leng Hongjie Cheng Xuhui Zhang Hongxian Liu Weifeng Lyu 

机构地区：[1]PetroChina Xinjiang Oilfield,Research Institute of Exploration and Development,Karamay,Xinjiang,843000,China [2]College of Mechanical and Transportation Engineering,China University of Petroleum(Beijing),Beijing,102249,China [3]Institute of Mechanics,Chinese Academy of Sciences,Beijing,100190,China [4]Department of Petroleum Engineering,China University of Petroleum-Beijing at Karamay,Karamay,Xinjiang,834000,China [5]State Key Laboratory of Enhance Oil Recovery,Research Institute of Petroleum Exploration and Development,PetroChina,Beijing,100083,China

出　　处：《Petroleum Research》2020年第2期164-169,共6页石油研究（英文）

基　　金：The writers greatly appreciate the financial support of the Major Special Project of PetroChina Co Ltd.(2017E-0406);the National Science and Technology Major Project during the 13th Five-year Plan Period(2016ZX05010-00504).

摘　　要：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 micro-fractures.The 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 

分 类 号：O35[理学—流体力学]