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| A fluid-solid coupling continuum-discontinuum method considering element splitting and simulation of directional hydraulic fracturing |
| Received:April 19, 2021 Revised:July 01, 2021 |
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| DOI：10.7511/jslx20210419001 |
| KeyWord:continuous-discrete element hydraulic fracturing fluid-solid coupling perforation angle horizontal stress |
| Author | Institution |
| 白雪元 |
辽宁工程技术大学 力学与工程学院, 阜新 |
| 王学滨 |
辽宁工程技术大学 计算力学研究所, 阜新 |
| 刘桐辛 |
辽宁工程技术大学 力学与工程学院, 阜新 |
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| Abstract: |
| In order to simulate rock deformations,fracture propagations and fluid flows,a fluid-solid coupling method was developed based on the method that combines the Lagrangian element method and discrete element method.In this method,fractures can propagate along diagonal lines and edges of quadrilateral elements,and fluid flows according to the cubic law.This method was verified by comparing the present results with the theoretical results of the unsteady seepage model with a single fracture and the KGD model.The following results were found from the simulations of hydraulic fracturing containing oriented perforations.(1) With the increase of the distance far away from the perforation,fluid pressures decrease;with the increase of time,fluid pressures in fractures decrease.(2) With the increase of the perforation angle,fluid pressures corresponding to the fracture initiation increase,fluid pressures during the process of the fracture propagation increase,and the turning distances of fractures increase;with the increase of the horizontal stress in the x-direction,fluid pressures corresponding to the fracture initiation increase,and fluid pressures during the process of the fracture propagation increase;the larger the difference between the two horizontal stresses,the smaller the turning distances of fractures.(3) With the increase of time,the number of fracture segments increases,but their increasing speeds decrease,which is related to the increase of the fracture volume. |
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