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Table of Contents
doi:10.2204/iodp.sp.309312.2005
Table T2. Contingency operations time estimates.
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Open hole to 500 m subbasement and install 750 m of 10.75 inch casing
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Run in hole
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10.50
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0.44
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0.44
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Open hole from 9.875 to 18.5 inches
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483.90
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20.16
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20.60
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Bit change
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212.92
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8.87
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29.47
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Pull out of hole
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10.50
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0.44
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29.91
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Make up casing string
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24.00
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1.00
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30.91
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Run in hole with casing
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16.00
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0.67
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31.58
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Run casing
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22.00
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0.92
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32.49
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Cement and R/T
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24.00
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1.00
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33.49
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Drill out cement
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4.00
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0.17
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33.66
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Trip
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12.00
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0.50
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34.16
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Install new reentry cone and 20 and 16 inch casing
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Jet 20 inch casing
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30.60
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1.3
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Pull out of hole
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9.70
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0.4
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1.7
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Make up, run in hole, reenter
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10.00
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0.4
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2.1
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Open hole 20 m subbasement
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52.00
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2.1
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4.3
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Pull out of hole
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10.00
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0.4
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4.7
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Makeup 270 m of 16 inch casing
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8.00
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0.3
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5.0
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Run in hole and reenter
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8.60
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0.4
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5.4
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Land casing
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9.00
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0.4
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5.7
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Cement casing
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0.25
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0.0
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5.8
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Clear seafloor
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3.50
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0.1
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5.9
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CADA on surface
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7.75
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0.3
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6.2
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Makeup bit and RCB bottom-hole assembly
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1.50
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0.1
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6.3
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Run in hole and reenter
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8.50
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0.4
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6.6
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To top of cement
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3.25
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0.1
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6.8
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Drill out cement
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4.00
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0.2
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6.9
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Pull out of hole
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9.00
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0.4
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7.3
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Single-bit holes (100–150 m subbasement)
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Run in hole
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10.50
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0.4
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0.4
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Core to bit destruction
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85.00
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3.5
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3.9
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Drop bit, log
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24.00
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1.0
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4.9
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Multi-bit holes (200–300 m subbasement)
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Run in hole
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10.50
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0.4
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0.4
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Core to 50 hours on bit
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65.00
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2.7
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3.1
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Drop free-fall funnel; pull out of hole
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10.00
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0.4
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3.5
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Run in hole
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10.50
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0.4
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3.9
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Core to bit destruction
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85.00
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3.5
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7.4
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Drop bit, log
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36.00
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1.5
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8.9
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Log Hole 504B
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Transit to Hole 504B
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60.00
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2.5
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2.5
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Run in hole
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10.00
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0.4
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2.9
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Water Sampling Temperature Probe
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4.00
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0.2
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3.1
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Triple combo, Formation MicroScanner-sonic, Ultrasonic Borehole Imager, GBM magnetometer, Well Seismic Tool
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108.00
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4.5
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7.6
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Deepen Hole 896A
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Run in hole
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10.00
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0.4
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0.4
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Water Sampling Temperature Probe
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4.00
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0.2
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0.6
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Core to 50 hours on bit
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65.00
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2.7
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3.7
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Logging
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108.00
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4.5
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8.2
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Note: Add 3.7 days and 100 m penetration per bit run.
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