Transcript
IADC Classification Chart
Secur Se curity ity DB DBS S Dr Drill ill Bits Bits
Steel Tooth Bits
Features
s e i r e S
1
2 3
Formations Soft formations with low compressive strength and high drillability
e p y T
1 2 3
Medium to medium-hard formations with high compressive strength
1
Hard semi-abrasive or abrasive formations
1 2 4
1 Standard Roller
4 Sealed Roller
Bearing
Bearing
S B D y t i r u c e S
g o l a c y H d e e R
XN1 Y11
S B D y t s e h i r h i t u g c u m e H S S
g o l a c y H d e e R
R1 DSJ
s e h g u H
GTX-1
6 Sealed Friction 5 Sealed Roller Bearing Gauge Protected
h t i m S
SDS
S B D y t i r u c e S
g o l a c y H d e e R
s e h g u H
XT1 EBXT1
T11 EMS11G ETS11G
GTX-G1 MAX-GT1 MX-1
MSDSH MSDSSH MGSSH+, MGSH+
DTJ DT J
XN33 Y13 XN
R3 DGJ
XN4
2
GTX-3 MGG+
V2J
XT3 EBXT3
T13 EMS13G ETS136
S B D y t i r u c e S
h t i m S
GTX-G3 MAX-GT3 MX-3
SDGH MSDGH MGGH+ SVH MSVH
XT4
7 Sealed Friction Bearing Gauge Protected
Bearing g o l a c y H d e e R
XS1 HP11
s e h g u H
GT-1
h t i m S
FDS FDSS+
S B D y t i r u c e S
g o l a c y H d e e R
s e h g u H
h t i m S
XSC1, XLC1 EBXS1, EBXSC1 EBXLC1
SL11, TC TC10 TC11, TD TD11 D11
XLX-1, GT-G1H GT-G1, ST STX-1, MX-1, ST STR-1, GT GT-1
MFDSH, FD FDS+, FD FDS+2, MFDSSH FDSS+2, FG FGS+, FG FGS+2, FG FGSH+ FGSS+, FG FGSS+2, XR XR+, FG FGSSH+
HP12
FDT
HP13
FDG
XS3 EBXS3
D13 HP13G
MX-3
FDGH, MFDGH
FV
XS4 EBXS4
HP21G
ATJ-G4
FVH
ATJ-4
SL12, HP12
DR5
XN5
L4H R7
In 1987, 1987, the International International Association Association of Drilling Contractors Contractors (IADC) (IADC) initiated the use of a four-character four-character IADC system for roller cone bits. In 1992, the system was expanded to include more more features. The system involves the the combination of the traditional three-numeral three-numeral system with a fourth alpha character. character. This fourth character character more clearly defines additional features features of roller cone bits with regard to cutting structures, structu res, bearin bearings, gs, seals seals,, hyd hydrauli raulics cs and speci specific fic applications applications.. The codes to the right are used in the fourth fourth position of the fourth-character IADC bit classification system.
ATJ-G8
IADC Code – 4th Character Classification 4th Code Character A B C D E G H J L M S T W X Y Z
Feature Air application (journal bearing with air nozzles) Special bearing seal Center jet Deviation control Extended jets (full length) Extra gauge/body protection Horizontal/steering application Jet deflection Lug pads Motor application Standard steel tooth model Two cone Enhanced cutting structure Predominantly chisel tooth inserts Predominantly conical inserts Other shape inserts
Security DBS Nomenclature A – C – – G – – L – – – C*, D* Even, 2nd digit Odd, 2nd digit –
* – Prefix (usually precedes bit number, others are suffixes)
HALLIBURTON
