Pressure Reversal

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Change from predominant pressure in the annulus to predominant pressure in the work string bore or vice versa.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards

Change in the direction of the pressure differential across the packing element from above to below or vice versa.

Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards

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