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A numerical investigation of gas flow behavior in two-layered coal seams considering interlayer interference and heterogeneity

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International Journal of Mining Science and Technology 2021年第4期31卷 699-716页

作者： Ziwei Wang Yong Qin Teng Li Xiaoyang Zhang Key Laboratory of Coalbed Methane Resources&Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China College of Petroleum Engineering Xi’an Shiyou UniversityXi’an 710065China College of Earth Sciences and Engineering Shandong University of Science and TechnologyQingdao 266590China

Multiple-seam gas coproduction is a technology with potential to achieve economic *** experiments could replicate gas flow dynamics in two *** this study,numerical simulation was conducted based on physical *** calibration,the simulated results agreed with the experimental *** findings were ***,the pressure distribution intrinsically depends on the depressurization effectiveness in each coal *** gas pressure difference and interval distance influence the pressure distribution by inhibiting depressurization in the top seams and bottom seams,***,the production contribution shows a logarithmic relationship with the permeability *** range of the production contribution difference grows from 11.24%to 99.99%when the permeability ratio increases 50 *** comparison,reservoir pressure has a limited influence,with a maximum of 13.64%.Third,the interlayer interference of the top seams and bottom seams can be intensified by the reservoir pressure difference and the interval distance,*** proposed model has been calibrated and verified and can be directly applied to engineering,serving as a reference for reservoir combination *** summary,coal seams with a permeability ratio within 10,reservoir pressure difference within 1.50 MPa,and interval distances within 50 m are recommended to coproduce together.

关键词： Sublayer interlayer interference index permeability ratio Reservoir pressure difference Interval distance Production contribution

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Influence of formation heterogeneity on foam flooding performance using 2D and 3D models:an experimental study

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Petroleum Science 2020年第3期17卷 734-748页

作者： Ling-Zhi Hu Lin Sun Jin-Zhou Zhao Peng Wei Wan-Fen Pu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500SichuanChina MOE Key Laboratory of Oil and Gas Fine Chemicals School of Chemistry and Chemical Engineering.Xinjiang UniversityUrumchi 830046XinjiangChina Yumen Oilfield of Chinese National Petroleum Corp.Yumen 735211 GansuChina

The formation heterogeneity is considered as one of the major factors limiting the application of foam *** this paper,influences of formation properties,such as permeability,permeability distribution,interlayer,sedimentary rhythm and 3D heterogeneity,on the mobility control capability and oil displacement efficiency of foam flooding,were systematically investigated using 2D homogeneous and 2D/3D heterogeneous models under 120°C and salinity of 20×10~4 mg/*** flow resistance of foam was promoted as the permeability increased,which thus resulted in a considerable oil recovery *** the scenario of the vertical heterogeneous formations,it was observed that the permeability of the high-permeable layer was crucial to foam mobility control,and the positive rhythm appeared favorable to improve the foam flooding *** additional oil recovery increased to about 40%.The interlayer was favorable for the increases in mobility reduction factor and oil recovery of foam flooding when the low permeability ratio was *** the 3D heterogeneous formations,foam could efficiently adjust the areal and vertical heterogeneity through mobility control and gravity segregation,and thus enhancing the oil recovery to 11%–14%.The results derived from this work may provide some insight for the field test designs of foam flooding.

关键词： Foam flooding permeability ratio 2D/3D models Heterogeneity Enhanced oil recovery

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