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Hydrofractured seal leakage (view source)
Revision as of 17:07, 17 November 2014
, 17:07, 17 November 2014→Predicting leakage in shallow accumulations
==Predicting leakage in shallow accumulations==
==Predicting leakage in shallow accumulations==
Hydrofractured seals also leak in shallow accumulations of normal water pressure. At depths < 1000 ft, the absolute magnitude of the difference between water pressure and geostatic pressure is relatively small—on the order of several hundred pounds per square inch. Exceptionally thick (1000–2000 ft) columns of gas or oil have a [[capillary pressure]] equal to or greater than this difference, so hydrofracturing may occur.
Hydrofractured seals also leak in shallow accumulations of normal water pressure. At depths < 1000 ft, the absolute magnitude of the difference between water pressure and [[Geostatic and lithostatic pressure|geostatic pressure]] is relatively small—on the order of several hundred pounds per square inch. Exceptionally thick (1000–2000 ft) columns of gas or oil have a [[capillary pressure]] equal to or greater than this difference, so hydrofracturing may occur.
The potential for shallow hydrofractured leakage is best evaluated from a pressure-depth diagram, where
The potential for shallow hydrofractured leakage is best evaluated from a pressure-depth diagram, where