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Oilfield Glossary
Oilfield Glossary
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fracture gradient

Pressure versus depth plot
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1. n. [Geology]
The pressure required to induce fractures in rock at a given depth.
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2. n. [Well Testing]
The factor used to determine formation fracturing pressure as a function of well depth in units of psi/ft. For example, a fracture gradient of 0.7 psi/ft [15.8 kPa/m] in a well with a true vertical depth of 8000 ft [2440 m] would predict a fracturing pressure of 5600 psi [38.6 MPa].