Structural failure mechanism and strengthening method of fracture plugging zone for lost circulation control in deep naturally fractured reservoirs

XU Chengyuan,YAN Xiaopeng,KANG Yili,YOU Lijun,ZHANG Jingyi

Table 2 Basic parameters of the model.

Parameter Value Parameter Value Particle size distribution D90 0.5 mm Fiber tensile strength 35 MPa Fiber aspect ratio 50 Fiber concentration 4% Friction angle of particle surface 36° Fracture closure pressure 10 MPa Friction angle of fiber surface 24° Plugging zone porosity 15% Friction angle between plugg- ing zone and fracture surface 45° Plugging zone length 15 mm Elastic modulus of fiber 20 MPa Fracture width 1 mm