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TK13 LS HydrateStudyTukau Subsurface Team

19 March 2013

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Agenda

Background

Input Data

Findings

Conclusion

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Background

General Tukau oil field located approx. 25km from offshore Lutong Sarawak.

Water depth : 160 ft

Operated under Baram Delta Operation (BDO).

Tukau Revisit Project

During drilling program under NAG

reservoir was discovered.

This NAG reservoir proves to be new

source to compliment gaslift injection.

TK-13 LS was completed to have the

flexibility to produce oil or gas upon

demand.

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PCSB Input Data

TK 46 RFT sample 1 dated 1982:

Reservoir condition; Pressure: 1766 psi, Temperature: 155F

Max CITHP: 1475 psi as recorded during unloading job.

FTH; Pressure: 1370 psi, Temperature: 104F

Ambient condition: Pressure: 14.7 psi, Temperature: 75.2F Sea bed condition: Max Temp: 80.6F, Min Temp: 65.8F

WellRFT

SampleDate

H2S_pp

mCO2 N2 C1 C2 C3 iC4 nC4 iC5 nC5 C6 C7+

TK-46 1 11/07/82 0 4.33 0.26 88.08 5.62 0.88 0.33 0.1 0.1 0 0.1 0.3

TK-46 2 11/07/82 0 3.13 0.53 89.69 4.72 0.91 0.42 0.1 0.1 0 0.3 0.1

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Input Data Comparison

TECHNIP Tukau Actual

Condition

Remarks

P (psia) T (F) P (psia) T (F)

Reservoir 2500 95.06 1766 155

Ambient 14.7 75.2 14.7 75.2FTH 1516 85 1370 104 WTR during

unloading

Start up 1550 -49 1330 98 WTR during

unloading

Min Seabed 1447 68 65.84 69.28

Moderate Seabed 1263 77 - -

Max Seabed 1090 86 80.6 69.28

CITHP 1550 - 1475 - WTR during

unloading

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Findings

Plot shows variation of FTHP which is at hydratefree zone

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Plot shows variation of CITHP which is at hydrate

free zone

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Plot shows at different operational condition, hydrateformation is unlikely to happened.

Cond. P (psia) T(F)

Ambient 14.7 75.2

FTH 1370 104

Reservoir 1766 155

CITHP 1475 100

U/S 1370 104

Stat up D/S 150 60

Max seabed 69.3 80.6

Start up

(U/S) 1330 98

reservoirCITHP

FTH/US

ambientDS

Max seabed

Start up*

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Conclusion

No hydrate formation at Tukau 13 LS based on atFTHP.

No hydrate formation at Tukau 13 LS based on atCITHP.

No hydrate formation is expected at TK13 LS duringstart up.

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TK13 LS Hydrate Curve based on sample RFT 1

Hydrate zone

Hydrate free zone

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0

500

1000

1500

2000

2500

0 10 20 30 40 50 60 70 80

RFT 1

RFT 2

RFT 1 and RFT 2 matched

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Plot shows variation of pressure during stableproduction (5 MMscf/d) which is at hydrate free

zone

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D/S and U/S

Downstream 150 66 WTR during

unloading

Upstream 1370 104 WTR duringunloading

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-500

0

500

1000

1500

2000

2500

0 20 40 60 80 100 120 140 160 180 200

Pressure,

psia

Temperature,F

Hydrate Formation Curve for TK13 LS

Operational

Prosper

HWU

Phase envelope

FTH and

U/S

CITHP

Ambient

D/S

reservoir