Structural formation and evolution mechanisms of fracture plugging zone

XU Chengyuan,ZHANG Jingyi,KANG Yili,XU Feng,LIN Chong,YAN Xiaopeng,JING Haoran,SHANG Xiangyu

Table 2 Mesoscopic force chain network structures of fracture plugging zone corresponding to different parameters.

Parameter Value Strong chain ratio/% Maximum pressure/MPa The image of stress chain network corresponding to the highest pressure point Material shape Spherical 11.64 0.22 Spherical+ rectangle 16.20 0.35 Friction and fluid environment Dry 16.61 0.53 Oil soaked 14.64 0.44 Material type Rigid + elastic 13.86 0.46 Rigid + fiber 13.78 0.41 Porosity of plugging zone 8.95% 16.61 0.53 9.95% 15.50 0.48