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Minimum pressure 

LaTeX Math Inline
bodyp_b
required to start developing hydraulic fracture in a given rockinitiate rock fracture.

Often abbreviated as FBP.


One of the popular mathematical models is given by:

LaTeX Math Block
anchorpb
alignmentleft
 {\rm FBP} = p_b = 3 \, \sigma_{h, \rm min} - \sigma_{h, \rm max} + \sigma_t - p_i

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