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 1 Basic parameters of the loss control materials and drilling fluid.

Parameter Value Parameter Value Particle density 2 700 kg/m3 Fluid density 1 700 kg/m3 Particle equivalent diameter and fracture outlet width ratio 0.4-1.0 Restitution coefficient 0.5 Particle insert velocity 0.5 m/s Elastic modulus 1 GPa Fluid initial velocity 0.5 m/s Poisson's ratio 0.3 Hydrodynamic viscosity 50 mPa·s Friction coefficient 0.6, 0.8, 1.0, 1.2