Figure F21. Measurement-while-drilling results at Site U1323. Annular pressure while drilling (APWD), annular pressure in excess of hydrostatic (APWD*), and equivalent circulating density referenced to the seafloor (ECDrsf) at Hole U1323A. The ECDrsf and APWD* curves show characteristic decreasing and increasing trends, respectively, over the upper 150 mbsf. At 198 mbsf, a 3 m thick sand layer recorded an increase in APWD of ~150 psi over the background drilling pressure. This was interpreted to record flow of sand into the borehole. Mud weight was raised and the well was ultimately cemented and abandoned at 238 mbsf. TWT = two-way travel time, GR = gamma radiation.
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