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Table T12. Hammer drill drilling test data, Hole 1106D.

Time
(UTC)

Flow rate
(gpm)

Pressure
(psi)

Weight
on bit
(lb)

Rotary
speed
(rpm)

Notes

0340

140
475

10,000-12,000

0



210
915





250
1260

10,000-12,000

0

Average 2 m of heave

0348

300
2500



Pressure continuing to climb






Shut off pumps and bleed off pressure






Restart pumps and try again


105
560


0



150


0

Pressure building

0355

300


0

Pick up and flush off bottom






Lower to seafloor and retry start


80
550


0



160
1374


0

2-3 m of heave





0

Hammer firing intermittently


200
2000



Same scenario as last run, appears piston is binding in bush

0404





POOH

Notes: Water depth = 742.5 mbrf; bit = SDS flat-face.

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