A fracture sliding potential index for wellbore stability analysis

New insights on fracture roughness and wall mismatch in carbonate reservoir rocks

“…5C). The sliding potential can be correlated to slope instabilities; the rougher the fracture surface, the lower is the sliding potential (e.g., Younessi and Rasouli, 2010). The drilled boreholes (X-01 and X-03) did not have any signs of instability issues such as collapse or tight holes.…”

Wellbore instability in shale gas wells drilled by oil-based fluids

“…Particle sizes of minerals have an important influence on the shale alkali erosion, so the asperities on fracture faces and shale block surfaces can be susceptible to be corroded and disappear gradually in alkaline conditions, since shale is make up of fine mineral particles, which will smooth the fracture and shale block surfaces and decrease the friction force between shale blocks (Fig. 6c), resulting in sliding failure along the fractures intersecting a wellbore [17] (Fig. 6d).…”

A wellbore stability analysis model with chemical-mechanical coupling for shale gas reservoirs

“…The results of that study indicated that rocks would fail along weak planes under certain conditions, which had significant effects on wellbore stability. Following Aadnøy, various researchers proposed new methods to determine wellbore stability by assuming that rocks were transversely isotropic materials with anisotropic strength behaviors (Aadnøy and Chenevert, 1987;Aadnøy, 1988;Ong andRoegiers, 1993, 1996;Ong, 1994;Okland and Cook, 1998;Gupta and Zaman, 1999;Zhang, 2008Zhang, , 2009Chen et al, 2008a,b;Pei, 2008;Al-Bazali et al, 2009;Younessi and Rasouli, 2010;Tan et al, 2010;Jin et al, 2013;Hou et al, 2013;Zhang, 2013). Their works indicated that neglecting the effects of anisotropy could result in incorrect results.…”