Effect of Borehole Pressurization Scheme on Breakdown Pressure
In hydraulic fracturing, breakdown pressure is the peak fluid pressure at which a borehole fractures (breaks down). Several experimental studies showed that the breakdown pressure increases as the borehole pressurization rate is increased (Haimson and Fairhurst 1969; Haimson and Zhao 1991; Ito and Hayashi 1991; Guo et al. 1993a). Theoretical analyses of breakdown dependence on borehole pressurization rate were reported by several authors (Rice and Cleary 1976; Detournay and Cheng 1992; Ito 2008). Different models used in estimating breakdown pressure were comprehensively evaluated and reported by Guo et al. (1993b).
Laboratory experiments on dry cement blocks under triaxial stress showed that the breakdown pressure can be reduced by pressurizing the wellbore in a cyclic manner (Falser et al. 2016). Similarly, when a wellbore is maintained at a constant fluid pressure that is lower than breakdown pressure, a hydraulic fracture may be formed after a certain time. This is...
KeywordsHydraulic fracturing Breakdown pressure Cyclic fluid injection Static fatigue Specimen saturation Fracturing experiments
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