Figure F38. Annular pressure while drilling (APWD) monitoring of Hole U1320B. Near-linear increase of APWD is interpreted as stable borehole conditions without shallow-water flow problems. Variations in annular overpressure in excess of hydrostatic (APWD*), equivalent circulating density referenced to seafloor (ECDrsf,) and caliper measurements are interpreted as loose material filling the borehole annulus, especially when encountering sand units. SF = seafloor.
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