z CONFIDENTIAL AND PROPRIETARY

Any use of this material without specific permission of PT Pertamina EP is

strictly prohibited BANGKITKAN ENERGI NEGERI

MANAGING MATURE FIELDS IN PERTAMINA EP

Jakarta, April 6th, 2017 Andi W. Bachtiar VP Enhanced Oil Recovery Pertamina EP

Pertamina EP Operation Area

ASSET 1

Field

Operation Area Geographic

1. Field Rantau Aceh

2. Field Pangkalan Susu

North Sumatera

3. Field Lirik Riau

4. Field Jambi Jambi

5. Field Ramba South Sumatera

Unitisation

Operation Area Operator

Tanjung Pertamina EP

Suban Conoco Philips (Grissik) Ltd.

ASSET 2

Field

Operation Area Geographic

1. Field Prabumulih South Sumatera

2. Field Pendopo South Sumatera

3. Field Limau South Sumatera

4. Field ADERA South Sumatera

Project

Operation Area Geographic

PP Gas Pakugajah South Sumatera

Unitisation

Operation Area Operator

Air Serdang JOB Pertamina – Talisman Ogan

Komering

ASSET 3

Field

Operation Area Geographic

1. Field Subang West java

2. Field Jatibarang West java

3. Field Tambun West java

Project

Operation Area Geographic

PP Pondok Makmur West java

Unitisation

Operation Area Operator

MB Unit PHE ONWJ

ASSET 4

Field

Operation Area Geographic

1. Field Cepu Central –East Java

2. Field Poleng East Java

3. Field Matindok Central Sulawesi

Project

Operation Area Geographic

PP Gas Jawa Central Java

PP Gas Matindok Central Sulawesi

Unitisation

Operation Area Operator

Jambaran-Tiung Biru

PEPC

Sukowati JOB Pertamina – Petrochina East Java

ASSET 5

Field

Operation Area Geographic

1. Field Sangatta East Kalimantan

2. Field Bunyu East Kalimantan

3. Field Tanjung South Kalimantan

4. Field Sangasanga East Kalimantan

5. Field Tarakan East Kalimantan

6. Field Papua West Papua

Unitisation

Operation Area Operator

Wakamuk Petrogas (Basin) Ltd.

2

Historical Production

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120.000

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140.000 BP

Bor

WO

WI

Eksisting+Kondensat

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

101.258 109.633 116.620 127.137 129.955 124.999 127.635 121.513 117.030 100.558

83.672

2440

89108113108

86807482

42

● Jumlah Sumur Bor

Jumlah Sumur Bor

Sukowati

Tambun ph.2

BN-18

Niru, Sukowati,

Sangasanga

Limau, Sukowati,

Bunyu

3

Challenged in Mature Fields

• Declining oil production and reservoir pressure

• High Liquid Production Surface Facility Capacity & reliability, more injection wells

• Need more artificial lift need more power capacity

• Scale up problem starts from wellbore into Gathering Station Stimulation, scale inhibitor

• More sand problem occured, more well intervention activities

• Need more chemicals for liquid processing demulsifier, scale inhibitor, corrossion inhibitor

4

Managing Mature Fields

Managing Strategy to Increase Production

Infill Drilling Outstep Drilling Workover and

Well Intervention Waterflood &

EOR Surface Facility

Reliability

Need More :

Surface Facility Capacity

(Tanks, Power, Pumps, Separation System etc)

Injection Wells Chemicals needed for liquid

processing (demulsifier, scale & corrosion inhibitor)

Mature Field : More Liquid Production

(Water Cut > 90%)

Less Oil Production

(Declining) High Operation Cost

5

Managing Mature Fields

1. INFILL DRILLING

- Hydrocarbon recovery acceleration.

- New opportunity by looking at low resistivity and thin layer reservoirs.

- Grid base approach for deltaic environment

- Appliication of advanced drilling techniques : UBD, Horizontal Drilling

2. OUTSTEP DRILLING

- New opportunity to increase production and reserves replacement ratio.

- New seismic and well data acquisition.

- GGRP Studies.

- New layers found from drilling activities, new well log data, GGRP studies.

- New opportunity by looking at low resistivity layer, thin layer reservoirs, tight reservoirs.

- Fracturing & well stimulation.

3. WORKOVER / WELL INTERVENTION

- Secondary Recovery /Waterflood : Studies, Pilot & full scale waterflood at selected fields.

- Tertiary Recovery : Laboratorium Studies, GGRP Study, Field Trial and Pilot at selected fields.

4. EOR / SECONDARY AND TERTIARY RECOVERY

183 Active structures:

- Most of it has been produced before 1970

- RF Current 26%

- Np/EUR > 70%

ARE MANAGED THROUGH.....

6

Success Story : Sangasanga

Reactivation of Suspended Wells

Only 10% from 3100 drilled wells are active wells, either as producers or injectors.

In period 2009 – 2012, 209 wells were reactivated with 34% success ratio.

Lifting Optimization

Lifting optimization through re-sizing SRP from capacity of 200-400 Bfpd into 800-1000 Bfpd.

Lifting optimization contributes the most production gain compares to other well intervention activities.

Development Drilling

Drilling program is made based on recoverable reserves and available space and phase implementation.

Subsurface at East Kalimantan area is commonly deltaic reservoir that has both opportunities & risks with 70% success ratio.

Sustainable Production

NIIHM (Nederlandsch-Indische

Industrie en Handel Maatschppij)

BPM (Batavia Petroleum Maatschppij) 1905-1942

Japan 1942-1945

BPM/Shell/Permina/Pertamina 1945-1972

TIPCO - Tesoro 1972-1992

PTEN - Medco E&P 1992-2008

Pertamina EP 2008-Now

1897-1905

Results: Maintain and also increase

production (sustainable) 101-138%

Infill & step out drilling give additional reserves as much as 11.1 MMBO

History of Sangasanga Block

7

Well Intervention

Main productive layers in Limau especially Niru and Limau Barat are W, X and Y series

Reopening upper series such as R and S series which has been suspended

Lifting Optimization

Optimize Lifting method using ESP and SRP.

Development Drilling

GGR remodelling with new approach of stratigraphic sequences Outstep drilling, discovered new pool North side of Niru, new

Layer at Limau Barat

Horizontal Drilling implementation to optimize oil recovery

Results: Increase production from

5.895 BOPD to 11.200 BOPD

Infill & step out drilling results in additional reserves 212 MMBO

History of Limau Block 1943 Discovered by BPM

1989-1998 JOB Husky

1998 - 2005 JOB Sea Union

2005 - now PEP

Thousand, bopd

Success Story : Limau

8

• Development Drilling

Based on newly acquired 3D seismic interpretation and GGR re-modelling new

pool discovery at PB series layer of GRM.

Curently 20 infill and step out wells have been drilled to develop oil and gas reserves in PB Series layer

Multi layer completion to save rig cost and strive for efficiency in operation.

Workover & Well Intervention

67 workovers dan well interventions were executed in 2010 to 2017, mostly in PB series layer to optimize oil & gas production.

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-2450411200 411600 412000 412400 412800 413200 413600 414000 414400 414800 415200 415600 416000

411200 411600 412000 412400 412800 413200 413600 414000 414400 414800 415200 415600 416000

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Results: Increase production from 238

BOPD and 5 MMscfd into 957 BOPD and 36 MMscfd

Infill & step out drilling results in additional reserves 4.6 MMBO and 66 BSCF

Success Story : Prabumulih Barat

9

• Development Drilling & Workover

Drilling Results:

17 production wells and 11 Injection wells

Workover & well intervention Results:

20 production wells and 4 injection wells

7 waterflood patterns have been developed at layer Z600

Upgrade and repair production and injection facilities: Gathering Station, Water Treatment Plant / Water Injection Plant

Results: Increase oil production

from 500 BOPD into 1500 BOPD

Secondary WF PEP Phase is currently resulting in additional oil cumulative production of 2.3 MMBO from total additional reserves target of 20.32 MMBO

History of Production and Injection Rantau Z600

Oil Cum

(MMBBL)RF (%)

Oil Cum

(MMBBL)RF (%)

Oil Cum

(MMBBL)RF (%)

A1 15.7 3.77 24% 0.0 0.0% 0.6 3.9%

A2 10.6 3.57 34% 0.0 0.0% 0.8 7.7%

B 7.8 2.98 38% 0.0 0.0% 0.0 0.5%

C1 18.7 7.18 38% 0.0 0.0% 0.5 2.9%

C2 10.4 2.40 23% 0.7 7.0% 0.0 0.2%

D1 9.2 1.39 15% 0.6 7.0% 0.0 0.2%

D2 13.9 3.73 27% 0.9 6.4% 0.1 0.7%

D3 10.3 1.96 19% 0.9 8.6% 0.0 0.1%

D4 16.7 2.79 17% 0.4 2.7% 0.1 0.6%

E 15.7 0.26 2% 0.0 0.0% 0.0 0.0%

Total 129.0 30.02 23% 3.6 2.8% 2.3 1.8%

BLOKOOIP

(MMSTB)

Primary Phase

Secondary

JAPEX Phase

Secondary

PEP Phase

Success Story : Rantau Waterflood

10

Water Treatment Injection Plant

Rantau

WTIP Facility Rantau Before and After Development

Submanifold SP 3 Facility Before and After Development

Production History & Forecast

11