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Table T2. Operation acronyms.

Acronym
Defininition
Comment
APC
Advanced Piston Corer
A coring tool
APCT
Advanced Piston Corer Temperature tool
An APC coring shoe with termistors for making temperature measurements
BCR
Bi-centered reamer
A bit used to open holes to a larger diameter than the bit diameter
BHA
Bottom-hole assembly
The bit, the thick-wall joints of pipe, and other parts that are at the bottom of the drill string
CADA
Cam-actuated drill ahead
A casing running tool made by Drill Quip
DDI
Downhole Designs, Incorporated
A company
DP
Dynamic positioning
A shipboard navigation system
EOP
End of pipe
The end of the pipe
FMS
Formation MicroScanner
A logging tool
gpm
Gallons per minute
A circulation rate for fluids out the end of the drill pipe
GPS
Global Positioning System
A satellite navigation system
GUATB-03C
Guatemalan Basin site selected for drilling
Now known as Site 1256
LGH
Lower guide horn
A guide located below the moonpool that keeps the pipe from getting bent sharply at the base of the ship
mbrf
Meters below rig floor
Depth measured from the rig floor
mbsf
Meters below seafloor
Depth measured from the seafloor
PDR
Precision depth recorder
An instrument for estimating water depth
PFT
Perfluorocarbon tracer
A dye used for microbiological cotamination tests
RCB
Rotary core barrel
A coring tool
ROP
Rate of penetration
A coring or drilling penetration rate
spm
Strokes per minute
A circulation rate for fluids out the end of the drill pipe; 1 spm 5 gpm
SSR
Subsurface release
A tool used for connecting to and releasing from casing
UTC
Universal Time Coordinated
A time standard
VIT
Vibration-isolated television
The camera that is lowered along the drill string
WHC
Wireline heave compensator
Reduces motion of wireline tools by compensating for ship heave
WOB
Weight on bit
The weight at the bit
WOW
Waiting on weather
An operational delay caused by weather conditions
WOW
Waiting on whales
An operational delay in using the seismic guns because whales were in the vicinity
XCB
Extended core barrel
A coring tool

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