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Geology and geomechanics of hydraulic fracturing in the Marcellus shale gas play and their potential applications to the fuling shale gas development

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能源地球科学(英文) 2020年第1期1卷 36-46页

作者： Herong Zheng Jincai Zhang Yuanchang Qi Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Sinopec Tech Houston HoustonTX77056USA

Geological characteristics,geomechanical behavior and hydraulic fracture propagation mechanism in the Marcellus shale gas play are analyzed and compared with China’s fuling shale *** experiences in hydraulic fracturing and shale gas development in the Marcellus shale gas play are summarized,which might be applicable in other shale *** main factors contributing to the successful development of the Marcellus shale gas play include adoption of advanced drilling and completion technologies,increases of hydraulic fracturing stages,proppant concentration and fluid injection *** geological and geomechanical mechanisms related to those technologies are analyzed,particularly the in-situ stress impacts on hydraulic *** minimum horizontal stress controls where the fractures are initiated,and the maximum horizontal stress dominates the direction of the hydraulic fracture *** fracturing performed in the shale reservoir normally has no stress barriers in most cases because the shale has a high minimum horizontal stress,inducing hydraulic fractures propagating beyond the reservoir zone,resulting in inefficient *** is a common problem in shale plays,and its mechanism is studied in the *** is also found that the on-azimuth well has a higher productivity than the off-azimuth well,because shear fractures are created in the off-azimuth well,causing main fractures to kink and increasing fracture tortuosity and *** fuling shale gas play has a markedly higher minimum horizontal stress and much smaller horizontal stress *** high minimum horizontal stress causes a much higher formation breakdown pressure;therefore,hydraulic fracturing in the fuling shale gas play needs a higher treatment pressure,which implies higher difficulty in fracture *** small difference in the two horizontal stresses in the fuling shale gas play generates shorter and more complex hydraulic fractures,because hydraul

关键词： Marcellus shale fuling shale Geology Geomechanics In-situ stresses Hydraulic fracturing

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