Press to Close

Table T11. Hammer drill drilling test data, Hole 1106C.

Time
(UTC)

Flow rate
(gpm)

Pressure
(psi)

Weight
on bit
(lb)

Rotary
speed
(rpm)

Torque
(ft-lb)

Notes








1830

150

55




Bit off seafloor


135

450

10,000-14,000

0

0



215

982

10,000-14,000

0

0


1840

250

1,150-1,230

10,000-12,000

10



1843






Heaving and stopping hammer







May have heaved out of hole and skidded downslope


250

1,145


0

0


1845

250

1,243

10,000-12,000

10




250

1,250




Stalled and restart

1850

300

1,580-1,620

10,000-12,000

10




350

1,940

10,000-12,000

15-20



1853






Heave and stall out

1855

345

1,935

10,000-12,000

15-20


1 m penetration

1900

350

1,950

10,000-12,000

15-20








2,500

Sticking

1905

225

1,455-2,300




Hammer running intermittently, bleed pressure off


225

2,300




Switch mud pumps to isolate source, bleed pressure off


150

650






200

1,450




Pressure rising, running intermittently







Pick up off bottom and flush

1912

115

15




Reset and try again


90

408






150

680-750






200

1,000-1,600




Intermittently running

1915






POOH

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

Press to Close