Fracture toughness interpretation from breakdown pressure

• Published in: Engineering fracture mechanics Vol. 243; p. 107518
• Main Authors: Gao, Yue, Detournay, Emmanuel
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 15.02.2021; Elsevier BV
• Subjects: Boreholes; Breakdown; Confining; Crack initiation; Crack propagation; Dependence; Fluid injection experiment; Fluid lag; Fluid pressure; Fracture mechanics; Fracture toughness; Fracture toughness measurement; Hydraulic fracture; Hydraulic fracturing; Mathematical models; Singular integral equations; Fluid lag; Fracture toughness measurement; Hydraulic fracture; Singular integral equations; Fluid injection experiment

One of the tests used to assess the possible dependence of the fracture toughness on stress relies on injecting fluid into a slotted borehole within a cylindrical rock sample subject to confining pressure and interpreting the toughness from the observed breakdown pressure. There is a wealth of exper...