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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 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

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A DATA-BASE SYSTEM FOR seepage CHARACTERISTIES OF INTACT ROCKS DISCONTINUITIES AND ROCK MASSES

A DATA-BASE SYSTEM FOR SEEPAGE CHARACTERISTIES OF INTACT ROC...

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岩石力学与环境岩土工程国际会议

作者： Hasan PIRTI mer AYDAN Sakarya University AdapaznTurkey Tokai University Shimizu 424 Japan

＜正＞Fluid flow through intact rock,discontinuities and rock mass is of great concern as it plays an important role in many engineering applications such as dam,underground storage for oil,water,nuclear waste disposals etc.Therefore,information on seepage characteristics of rock mass is necessary for assessing fluid transport and its mechanical effect.In this paper,the authors describe an integrated data-base system for seepage characteristics of intact rocks,discontinuities and rock masses.This data-base system is used to study interrelations between permeability and pore diameter,porosity, discontinuity aperture,RQD and confining pressure and to check the validity of theoretical relations.

关键词： seepage characteristics data-base permeability rock

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