performance tsk bits

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M E M O R A N D U M

TO : AS/FGHS/WW/JIS

CC : Engineers

Subject : TSK BITS PERFORMANCE

Date : September 2002

We make a study and analysis of the performance of TSK rock bits with thesize of 8 and 12 RB. We compare it with Reed bits that we have beenused into our wells, development and exploration well. The data are collectedfrom January 2002 until now.Parameters to evaluate the bits are cost/ft and final bit condition after ran.

12 Rock Bits

Development well (Kaji Semoga, Soka)

Some bits used in directional wells and the calculations as table bellows:

MFTR TYPE IADC BitCost(US$)

TotalFootage

TotalHours

Ave,ROP TotalGrading

Cost/Ft(US$/ft)

Remarks

TSK SSTMGP 117M

4,900 4834 45.5 106.3

2-2-1/8 4.54 1 bit drilled3 wells

REED MHT11G 117M

5,715 6849 64.2 106.7

3-3-1/8 4.39 1 bit drilled6 wells

Exploration well (Jata field)


TotalFootag

e

TotalHour

s

Ave,ROP

TotalGradin

g

Cost/Ft(US$/ft

)

Remarks

TSK SSTMGP 117M

4,900 1675 10.5 159.5

2-2-1/16

5.28 1 bit drilled1 well (Ver.)

TSK SSTMGP 117M

4,900 1790 35 51.1 2-3-1/16

10.07 1 bit drilled1 well(Direc.)

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8 Rock Bits

Development well (Kaji Semoga, Soka)

Some bits used in directional wells and the calculations as table bellows:


TotalFootag

e

TotalHour

s

Ave,ROP

TotalGradin

g

Cost/Ft(US$/ft

)

Remarks

TSK SSTMGP 117M

3,500 3386 34 99.83

2-2-1/16

4.80 1 bit drilled2 wells

M20GFP 517 3,500 499 25 20 2-2-1/8 25.8 1 bit drilled1 well

REED MHT11G 117

M

3,600 3384 34 99.5

3

2-2-

1/16

4.83 1 bit drilled

2 wells

Exploration well (Jata field)


TotalFootag

e

TotalHour

s

Ave,ROP

TotalGradin

g

Cost/Ft(US$/ft

)

Remarks

TSK SSTMGP 117M

3,500 2151 34 63.3 4-2-1/16

7.55 1 bit drilled1 well

M20GFP 517 3,500 104 10 10.4 1-1-1/16


HTC MX09 437 3,500 624 35.4 17.6 4-3-1/16


CONCLUSION AND RECOMMENDATION

12 Reed bit (MHT11GKP 117 M) have excellent performance when

drilled development wells (kaji semoga area). 1 bit can drilled into 6 wellwith lowest cost bit/ft US$ 4.39 or compared to TSK bit (SSTMGP 117 M),we can save to US$ 7,800.

We have no data for exploration well with other bits in 12 size. One TSK

bit can drill 1 well with bit cost/ft as lowest as to US$ 5.28.

We have experienced 12 RB TSK in Rambutan-deep#1 well, drilled with3 bits from 1500 to 5000 ft, all the bits had grading for the bearing wasnot effective seal, with tooth was variance between 3 to 6 scale, bitsdrilled in shale stone formation.

8 RB TSK (117 M) has good performance in development wells

compared to Reed bit, but some input from personnel in field and myexperienced, found the bearing is not effective seal, one of three coneshad shaky or insecure.

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My experienced in Jata#2, 8 TSK (117 M) drilled in sandstone

formation, when pull out the bit found the cone was shaky, suspectedthat the seal on bearing is not effective. We had run it with motorassemblies.

8 RB TSK (517) drilled in medium to hard formation (Baturaja and

Basement) in exploration well, has fair performance compared to Hughesbits. In development well 1 bit can drilled into 2 wells. Reed bit in 2001can drilled 2 until 3 wells only with one bit.

To accept TSK product in our operations, they should have considered to:

1. Improvement in Seal bearing, reliability of the bit is absolutelydepending on this seal. Since we will drill slim hole (6 to 6 1/8) infurther operation. They have to make a reliability chart every bit.

2. Improvement in teeth or cutter, my experienced found the teeth in

outer was broken in 2 run.

3. Gage protection in this bit is very good, almost 2 run is developmentwell the condition of the gage is in gage.

I formally recommend using TSK bit if they can fulfill the requirement asmentioned above, if not we can using another manufacture such reed bits.

Respectfully submitted by,

Gustioro

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