Modelling of fractured horizontal wells with complex fracture network in natural gas hydrate reservoirs |
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| Affiliation: | 1. Delft Institute of Applied Mathematics, Delft University of Technology, Mekelweg 4, 2628 CD, Delft, the Netherlands;2. College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China;1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266555, China;2. National Engineering Laboratory for Subsea Equipment Testing and Detection Technology, Qingdao 266555, China;3. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266555, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China;2. Institute of Fluid Science, Tohoku University, Sendai, 980-8577, Japan;3. School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing, 100049, China;4. National Institute of Technology, Hachinohe College, Tamonoki, 039-1192, Japan;1. College of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;2. Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence 66045, USA;3. Technology Research Department, CNOOC Research Center, Beijing 100027, China |
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| Abstract: | Shale gas resources (SGR), as a representative of natural gas hydrate reservoirs, have been the main energy supply for the energy consumption currently. The multi-scale pore structure of shale, complicated seepage mechanisms, including Knudsen diffusion, matrix deformation, stress sensitivity, non-Darcy flow and spatial fracture network stimulated by hydraulic fracturing technology have posed huge challenges to an accurate prediction and assessment of shale gas recovery. A full understanding of gas seepage mechanism of shale gas is the critical and scientific issue to develop carbon hydrogen energy resources effectively. It is very urgent to establish a comprehensive mathematical model to analyze the productivity capacity through simultaneously considering various flow mechanisms and fractures network system. To fill this gap, this paper presents a comprehensive numerical model of hydraulic fracturing horizontal well with discrete fracture network where embedded discrete fracture model (EDFM) is employed to characterize the coupled phenomenon between discrete fracture network and fractured SGR. And then two numerical discretization methods, e.g., finite difference and finite-volume, are used to numerically discretize the equations, subsequently, the Newton-Raphson iterative method is adopted to obtain the final solutions. Finally, the sensitivity analysis experiments are employed to investigate the effects of the key parameters. The results can provide some certain guidance for the optimization of stimulated treatment in natural gas hydrate reservoirs. |
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| Keywords: | Natural gas hydrate resource Fractured horizontal well Fracture network Numerical modelling Sensitivity analysis |
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