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IADC : Dull Bit GradingCutting structure

Inner Outer Dull Char Location Bearings seals Gauge Other dull char Reason pulled

1 2 3 4 5 6 7 8

1 - 4 - Location2 - Roller cone Fixed cutter

Steel toothed bits Measure of lost tooth height due to abrasion and / or damage0 - No loss of tooth height

8 - Total loss of tooth

Insert bits 5 - Bearings and seals0 - No lost worn and / or broken inserts Non sealed bearings Sealed bearings8 - 0% of inserts and / or cutting structure remaining. A linear scale estimating bearing life is used

Fixed cutter bits Measure of lost tooth height due to abrasion and / or damage 0 = No life used ---> 8, 100% bearing life used

0 - No lost, worn and / or broken cutting structure 6 - Gauge8 - 100% of cutting structure lost, worn and / or broken

3 - Dull characteristicsNote: use only cutting structure related codes etc.

7 - Other dull characteristics

8 - Reasons bit was pulled or run completed

Example of bit grading : 2, 4, BT, M, E, X, (CT,WO), DTF.

Inner cutting structure (All inner rows.)Outer cutting structure ( Gauge rows only.)

In columns 1 and 2 a linear scale of 0 ---> 8 is used to describe the condition of the cutting structure according to the following guidelines for specific bit types. N- Nose row G - Gauge row C - Cone S - Shoulder

M - Middle row A - All Rows N - Nose G - GuageState cone # or #'s I.e. 1, 2, or 3. T - Taper A - All areas

Measures total cutting structure reduction of lost, worn, & or broken inserts

E - Seals effective F - Seals failedN - Not able to grade X - Fixed cutter bit

x - in gauge 1/16 - 1/16" out of gauge 1/8 - 1/8" ut of gauge 3/16-3/16" out of gauge

1/4 - 1/14" out of gauge 5/16 - 5/16" out of gauge 3/8 -3/8" out of gauge 7/16 - 7/16" out of gauge

1/2 - 1/2" out of gauge 9/16 - 9/16" out of gauge 5/8 - 5/8" out of gauge

BC - Broken cone * LN - Lost nozzle

BF - Bond failure LT - Lost teeth and cutters Refer to column 3 codes

BT - Broken teeth and cutters OC - Off centre wearBU - Balled up bit PB - Pinched bit BHA- Change bottom hole assembly HR - Hours on bitCC - Cracked cone * PN- Plugged nozzle or flow by areas DMF - Downhole motor failure LOG - Run logsCD - Cone dragged * RG - Rounded gauge DTF - Downhole tool failure PP - Pump pressureCI - Cone interference RO - Ring out DSF - Drill string failure PR - Penetration rateCR - Cored SD - Shirttail damage DST - Drill stem test Rig - Rig repairCT - Chipped Teeth & cutters SS - Shelf sharpening wear DP - Drill Plug TD - Total depth / casing depthER - Erosion TR - Cone tracking CM - Condition mud TW - Twist offFC - Flat crested wear WO - Wash out CP - Core point TQ - TorqueHC - Heat checking WT - Worn teeth or cutters FM - Formation change WC - Weather conditionsLD - Junk damage NO - No dull characteristics HP - Hole problemsLC - Lost cone * * Show cone # or #'s under location 4 LIH - Left in hole

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IADC classification : Rock bits Series Formation types 1 2 3 4 5 6 7 8

Milled tooth bits.3 8

1 Soft formations 1. Very soft shale Low compressive strengths 2. Soft shales

3. Medium soft shale / lime

4. Medium lime shale 2 Medium - Medium hard formation1. & 2. Medium lime / shale

High compressive strengths 3. Medium hard lime/sand/slate. 3 Hard 1. Hard lime

Semi-abrasive formations. 2. Hard lime/dolomite

3. Hard dolomite

TCI/Insert bits.4 Soft formations 1. Very soft shale

Low compressive strengths 2. Soft shales. 3. Medium soft shale / lime

4. Medium lime shale. 5 Soft - medium hard formations 1. Very soft shale / sand.

Low compressive strengths 2. Soft shale / sand.

3. Medium soft shale / lime. 6 Medium - hard formations 1. Medium lime / shale.

High compressive strengths 2. Medium hard lime / sand.

3. Medium hard lime/sand/slate 7 Hard semi - abrasive 1. Hard lime / dolomite.

and abrasive formations 2. Hard sand /dolomite.

3. Hard dolomite. 8 Extremely hard & abrasive 1. Hard chert.

& abrasive 2. Very hard chert. 3. Hard granite.

Standard roller bearing

Roller bearing air cooled

Sealed roller bearing

Sealed bearing, gauge

protected

Friction bearing

Sealed friction bearing, gauge

protection

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IADC classification : PDC bitsA B C DBit body Formation type Cutting structure Bit profile.

"M" Matrix 1 Very soft 2 PDC, 19mm 1 Short fishtail"S" Steel 3 PDC, 13mm 2 Short profile"D" Diamond 4 PDC, 8mm 3 Medium profile

2 Soft 2 PDC, 19mm 4 Long profile Example 3 PDC, 13mm

M Matrix 4 PDC, 8mm4 Medium 3 Soft to medium 2 PDC, 19mm3 PDC 13mm 3 PDC, 13mm4 Long profile 4 PDC, 8mm

4 Medium 2 PDC, 19mm3 PDC, 13mm4 PDC, 8mm

5 no code6 Medium hard 1 Natural diamond

2 TSP3 Combination

7 Hard 1 Natural diamond2 TSP3 Combination

8 Extremely hard 1 Natural diamond4 Impregnated diamond

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ManufacturerFeature and 4th Character Security / DBS Hughes Reed Smith

A A A AB Special bearing bit Standard ** ATM*C Centre jet J4 C* JC CD Deviation control D* A1E Extended jets (full length) E T* JX EG Extra gauge / body protection G*, M*, D, SS* M*, D, G JK G, L, D, ODH Horizontal / Steering Application Hx*, SS*, MM* M* M*J Jet deflection JD JD BH*L Lug pads L P* JL LM Motor application SS*, MM*, M* MAX* M* M*S Standard steel tooth model TC* A1T Two cone 2* D Dw Enhanced cutting structure D X Predominantly chisel toothed inserts - AY Predominantly conical inserts CFZ Other shaped inserts C*

* Prefix, usually precedes bit number, others are suffices.** Special HDS seal available as standard feature.

The 4th Character IADC code.

Air application (journal bearing with air nozzles)

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Total flow area (TFA) of Standard nozzles (ins2)

Number of nozzlesNozzle size 1 2 3 4 5 6 7 8 9

7/32 0.038 0.075 0.113 0.150 0.188 0.225 0.263 0.301 0.338 3/8 0.110 0.221 0.331 0.442 0.552 0.663 0.773 0.884 0.994 9/32 0.062 0.124 0.186 0.249 0.311 0.373 0.435 0.497 0.559 5/16 0.077 0.153 0.230 0.307 0.383 0.460 0.537 0.614 0.690 11/32 0.093 0.186 0.278 0.371 0.464 0.557 0.650 0.742 0.835 3/8 0.110 0.221 0.331 0.442 0.552 0.663 0.773 0.884 0.994

13/32 0.130 0.259 0.389 0.518 0.648 0.778 0.907 1.037 1.167 7/16 0.150 0.301 0.451 0.601 0.752 0.902 1.052 1.203 1.353 15/32 0.173 0.345 0.518 0.690 0.863 1.035 1.208 1.381 1.553 1/2 0.196 0.393 0.589 0.785 0.982 1.178 1.374 1.571 1.767

17/32 0.222 0.443 0.665 0.887 1.108 1.330 1.552 1.773 1.995 9/16 0.249 0.497 0.746 0.994 1.243 1.491 1.740 1.988 2.237 19/32 0.277 0.554 0.831 1.108 1.384 1.661 1.938 2.215 2.492 5/8 0.307 0.614 0.920 1.227 1.534 1.841 2.148 2.454 2.761

21/32 0.338 0.676 1.015 1.353 1.691 2.029 2.368 2.706 3.044 11/16 0.371 0.742 1.114 1.485 1.856 2.227 2.599 2.970 3.341 23/32 0.406 0.811 1.217 1.623 2.029 2.434 2.840 3.246 3.652 3/4 0.442 0.884 1.325 1.767 2.209 2.651 3.093 3.534 3.976

Bit calculations

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Insert values to view blue results. Bit cost (£) £ 23,000 Mud weight (ppg) 11 ppg Rig cost (£/hr) £ 4,000.00 Flow rate (gpm) 950 GPM Trip time (hrs) 18.0 hrs 0.81 sq in In hole time (hrs) 200.0 hrs Hole size (inches) 12.25 ins

Footage drilled (ft 3560 ft Hole area 118 sq inCost per foot 251.4 £/ft Bit pressure drop 1129 psi

Bit Hydraulic horse power 626 hp

Jet velocity 375 ft/sec

Hydraulic horse power per square inch 5.3 HSI

Rules of thumbWater based muds: aim for 4-8 HSI, jet velocities 350-550ft/secOil based muds: 3-6 HSI, jet velocities 250-450ft/sec>17 1/2" holes : minimum jet velocities must be attained<17 1/2" hole : 35-50% HHP @ bit. (consider formations to be drilled.)<12 1/4" hole more HSI, up to 65% at bit. (dependant upon formations to be drilled.)12 1/4" directional hole 800gpm min, 1100gpm max8 1/2" directional hole 450 - 650gpm.

Total flow area (in2)

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Drill off test

Weight on bit optimisation Rotary optimisation

RPM

50 Klbs 60 secs 0.6 ft 36 ft/hr 140 RPM 120 secs 30 ft/hr45 Klbs 68 secs 0.6 ft 29 ft/hr 130 RPM 110 secs 33 ft/hr40 Klbs 73 secs 0.6 ft 27 ft/hr 120 RPM 100 secs 36 ft/hr35 Klbs 75 secs 0.5 ft 22 ft/hr 110 RPM 108 secs 33 ft/hr30 Klbs 82 secs 0.5 ft 22 ft/hr 100 RPM 118 secs 31 ft/hr50 Klbs 62 secs 0.6 ft 35 ft/hr 140 RPM 124 secs 29 ft/hr

Bit weight (Klbs)

Time to drilloff 10K (seconds)

Footage drilled (ft)

Rate of penetration

(ft/hr)Time to drill 1ft

(seconds)Rate of

penetration (ft/hr)

100 RPM 120 RPM 140 RPM25 ft/hr

30 ft/hr

35 ft/hr

40 ft/hr

30 ft/hr

33 ft/hr

36 ft/hr

33 ft/hr

31 ft/hr

29 ft/hr

Drill off test (RPM)

RPM

Rat

e of

pen

etra

tion

30 Klbs 40 Klbs 50 Klbs60 secs

70 secs

80 secs

90 secs

60 secs

68 secs

73 secs

75 secs

82 secs

62 secs

Drill off test (WOB)

Weight on bit

Rate

of p

enet

ratio

n

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Bit API Reg. Pin Make up *ft/lbs

O. D. (in) Pin connection, size&type Torque (ftlbs) 3-3/4 - 4-1/2 2 3/8 reg 3500 ftlbs

4-5/8 - 5 2 7/8 reg 7000 ftlbs 5-1/8 - 7-3/8 3 1/2 reg 9000 ftlbs

7-5/8 - 9 4 1/2 reg 16000 ftlbs9-1/2 - 14-1/2 6 5/8 reg 32000 ftlbs

Over 14-1/2 7 5/8 reg 40000 ftlbs

API Roller cone bit tolerances..

Bit size : Nominal ( in inches )

5 5/8" - 13 3/4" + 1 / 32" minus 014" - 17 1/2 " + 1 / 16" minus 0

17 5/8" and larger + 3 / 32 " minus 0

API Diamond Bit Tolerances - PDC, Natural Diamond, TSP

Nominal Bit Size O.D. (ins) O.D. Tolerance (inches)

6-3/4 and Smaller +0, - 0.015 6-25/32 to 9, Incl. +0, - 0.020

9-1/32 to 13-3/4, Incl. +0, - 0.030 13-25/32 to 17-1/2, Incl. +0, - 0.045

Recommended drilling parameters, PDC bits.

Bit size(inches) Flow rate (GPM)

5 7/8 100 - 140 15 - 40 160 - 2606 100 - 140 15 - 40 160 - 280

6 ½ 100 - 140 15 - 40 220 - 3506 ¾ 100 - 140 15 - 40 250 - 3507 7/8 80 - 120 15 - 40 300 - 4008 ½ 80 - 120 15 - 40 300 - 5008 ¾ 80 - 120 15 - 40 350 - 5509 7/8 60 - 120 15 - 40 400 - 650

10 5/8 60 - 120 15 - 40 600 - 80012 ¼ 60 - 100 15 - 40 650 - 950

Recommended flow rates for diamond bits.Bit size(inches) Type Stone Size Exp. Flow rate (GPM)

6" MD34 2 n/a 180MD31 3 n/a 180MD33 4 n/a 180

8 ½" MD34 1 0.05 380MD31 4-Mar 0.04 380MD33 6 0.03 380MD70 ½ carat 0.45 (appr) 380

12 ¼" MD34 1 0.5 700MD31 2 0.045 700MD33 4-Feb 0.045 700

MD 197 1 carat 0.06 500 - 700

Rotary (RPM)

Weight on bit (Klbs)

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Bit record / hydraulics details. Rig : Field : Spud Date & time : Mud Pump : Oilwell 12-P-160 RT to Seabed = 379.0 feet.

Well No : TD date and time : Liner size : 5 1/2" Total (In hole) Hrs = 106Well type : Days spent on well to TD : Pressure rating : 4500 psi. Total rotating Hrs = 70

Bit details Bit hydraulics Depth Feet Total Rot ROP Parameters (Average) Mud details IADC Bit Grade Comments

No Size Mfgr Type Ser No Jets 32'nds TFA HSI ft/sec Out made Hrs Hrs feet WOB RPM TQ GPM PSI Type Wt Vis PV YP I O D L B G O R

1 rr3 26.00 REED Y11 JE2828 20 20 20 20 1.2 0.7 312 638 259 12.5 5.5 47 6 60/90 4/12 1200 800 SW 8.6 ~ ~ ~ 1 1 NO A E I NO TD

2 26.00 REED Y12 JE2828 20 20 20 20 1.2 0.8 286 638 0 2 0.5 0 5/15 60/90 4/6 1100 800 SW 8.6 ~ ~ ~ 1 1 NO A E I NO TD Drill cement.

3 rr2 17.50 Smith MSHOD CER4749 20 20 18 18 1.1 1.7 294 2550 1912 20 12.6 152 5/15 130 2/6 1020 2000 SW 8.6 ~ ~ ~ 1 1 No A E I NO TD

4 12.25 DBS QP19M 5940299 7 x 13 0.9 4.3 306 5761 3211 29 16.9 190 25/55 50/110 2/6 871 3650 WBM 11.8 46 27 23 3 2 LT CN X I FM

5 12.25 Reed 5940299 18 18 18 0 0.7 6.4 374 6148 387 16 14.3 27 35/50 120 2/6 871 3650 WBM 11.8 46 27 26 2 7 LT G12###1/16" BT PR Limestone/Chert, (90% in some samples )

6 12.25 BBits BB657 BB404413 2x 12 4x 14 0.8 5.1 336 7070 922 23 19.0 49 15/35 140/170 4/18 860 3600 WBM 11.8 46 28 24 1 1 No A X I No TD

7 8.50 Bbits BB657 405424RR 6 x 12 0.7 3.7 242 7085 15 3 1.0 15 7580 170 2/6 500 3900 OBM 13.5 70 40 20 Add 4.5hrs drilling cmt plugs etc.

6 x cutters on 36" hole opener, reamed hole due to angle.

Riserless, tertiary, reaming hole due to angle.

BT WT

Last 2.5 hrs on bit <100 ft/hr formation transition.

EHP 51HDL

Tertiary Limestone ( TOR, HOD etc. & Claystone.)