Figure F42. Annular pressure-while-drilling (APWD) monitoring of Hole U1322A. The almost linear increase of APWD is interpreted to record stable borehole conditions throughout the borehole and no shallow-water flow problems. Subtle variations in annular overpressure in excess of hydrostatic (APWD*), equivalent circulating density referenced to seafloor (ECDrsf), and caliper measurements are interpreted to reflect loose material filling the borehole annulus. Gamma ray (GR) and caliper measurements are shown for correlation. SF = seafloor.
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