Figure F4. Downhole gauge pressure (solid line) and temperature (dashed line) record during packer experiments, Hole U1301B (modified from Becker and Fisher, 2008). At the first setting depth of 472 mbsf, cold hydrostatic pressure in the hole was monitored for 30 min (H) before actual packer inflation (I). At each inflation depth, packer inflation produces an uncontrolled pulse in the pressure record as a sliding sleeve is shifted to lock the packers inflated and open a passageway from the pressurized drill string to the formation isolated below the packer element (S). Inset plots show example fits of analytical radial flow model to filtered packer pressure records, with time relative to the start of individual injection tests.
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