Study on fracture propagation behavior in ultra-heavy oil reservoirs based on true triaxial experiments

LIN Botao,SHI Can,ZHUANG Li,YOU Hongjuan,HUANG Yong

Table 3 Petrophysical and rock mechanical parameters of artificial interlayer, natural muddy interlayer, and natural mudstone interlayer.

Parameter Value Muddy interlayer Artificial interlayer Mudstone interlayer Mud content 40% 45% 50% Porosity 16% 8% 10% Water permeability 0.33×10-3 μm2 0.55×10-3 μm2 0.02×10-3 μm2 Elasticity Modulus 382 MPa 520 MPa 1 250 MPa Poisson's ratio 0.3 0.3 0.2 Inner friction angle 21.4° 40.3° 50.6° Cohesion 1.04 MPa 2.15 MPa 5.78 MPa Dilatant angle 17.0° 22.6° 38.7°