SUBSURFACE EVALUATION FULL SCALE EOR WATER FLOODING A - M FAULT ANTICLINE SHALLOW SAND MATURE RESERVOIR (O field – South Sumatera basin)

2. SUBSURFACE EVALUATION
FULL SCALE EOR WATER FLOODING A - M FAULT
ANTICLINE SHALLOW SAND MATURE RESERVOIR
(O field – South Sumatera basin)
By
Andi Anriansyah

3. EXECUTIVE SUMMARY
SUBSURFACE EVALUATION FULL SCALE EOR WATER FLOODING A - M FAULT
ANTICLINE SHALLOW SAND MATURE RESERVOIR
(O field – South Sumatera basin)
The A - M pattern water flooding is FULL SCALE scenario water flooding
inverted Pattern 5-9 spot in The O Field. A - M pattern consist of 13 (thirteen) Pattern,
from Pattern A to Pattern M. Pattern A, B, C, D are at fault blocks I by a layer production
is LSTC, Pattern E-F are at fault blocks II by a layer production is LSTC, Pattern G is at
fault blocks Pattern II while H & Pattern I was at fault blocks with a layer III Production is
S3, Pattern J & K are at fault blocks VII while the pattern L is at fault blocks VIII with a
layer of Production is S3, Pattern M is at fault blocks VII - VIII with a layer Production is
S5.
The reserves calculations A - M Water flooding performed by volumetric
equation and the Forecast production estimation are made in accordance with the
assumption on the pilot water flooding O-107. A - M pattern water flooding would be
about 1,918.8 MBO that can be drawn from remaining recoverable reserve 2,623 MBO
by water flooding A - M Pattern for 15 years (Table-1).
Production optimization by Water flooding with two patterns yearly from A - M
Pattern, The Production gain will be obtained addition of 648 BOPD at year of 6th
and
peak production gain reach 725 BOPD at period of 8th
. The Production from 2(two)
Pattern per-year plan forecast for 10 years The Operator will gain cumulative 1.78
MMBO (Figure 1).
Due to support A - M pattern water flooding, mainly continues Evaluation the pattern
then there are some well work program should be conducted as follows:
1. Well work for Full scale A - M Pattern, consist of Work over (add perforation),
such O-533, O-218, O-128, etc, Set packer, such O-288, O-268 or Logging (with
add perforation and Set packer) such O-063, O-180 etc. summarize in (Table 2)
2. The Water Injection Facilities will require 6000-7000 bbls water to be injected to
the A - M Pattern reservoir, then it should be additional water tank 4000-5000
bbls & Injection pump and accessories also pipe (flow line), for proper
engineering practices will be suggested by Facility engineer, Civil Engineer, and
Process engineer
3. Other Activity that support A - M pattern water injection and optimizing the
Production of The O Field such Stimulating the Reservoir Behavior and
Performance by SeMAR Technology, Reverse Co*ing Tool (RCT) by Geo
Reso*rce Services, Wellhead Compression by Ho*rbiger, etc..

4. Table-1. Forecast Summary A - M Pattern Figure-1 Forecast 2 (two) Patterns per year
Table-2. WELL WORK FOR FULL SCALE A - M WATER FLOODING
A O-257 LSTC Injector
B O-533 LSTC Injector, add perfo
B O-238 LSTC Injector
B O-233 LSTC Add perfo
C O-226 LSTC Injector
C O-218 LSTC Add perfo, set packer
D O-532 LSTC Injector
D O-231 LSTC Injector
D O-228 LSTC Set packer
D O-268 LSTC Set packer
E O-181A LSTC Injector
E O-128 LSTC Add perfo, set packer
F O-071 LSTC Injector
F O-525 LSTC Injector
F O-063 LSTC Logging, Add perfo, set packer
F O-180 LSTC Logging, Add perfo, set packer
F O-065 LSTC Add perfo, set packer
G O-138 S3 Logging
G O-099 S3 Injector, Add perfo, set packer
G O-139 S3 Logging, Set packer
G O-076 S3 Injector
H O-070 S3 Injector
H O-149 S3 Logging, Set packer
H O-069 S3 Injector
H O-289 S3 Logging
H O-110 S3 Logging
H O-080 S3 Logging
H O-111 S3 Injector, set packer
H O-502 S3 Set packer
RemarkPattern Well Name Layer
H-I O-083 S3 Logging
H-I O-600 S3 Injector, set packer
H-I O-113 S3 Logging
I O-601 S3 Set packer
I O-509 S3 Set packer
J O-256 S3 Logging
J O-013 S3 Logging
J O-195 S3 Logging
J O-051 S3 Injector
J O-281 S3 Logging
J O-014 S3 Logging
J O-197 S3 Logging
J O-163 S3 Logging
J-K O-501 S3 Injector, set packer
K O-148 S3 Logging, Add perfo
K O-032 S3 Logging
K O-040 S3 Injector
K O-044 S3 Logging
K O-301 S3 Injector
K O-261 S3 Logging
K O-336 S3 Logging
L O-500 S3 Set packer
L O-274 S3 Injector
L O-022 S3 Logging, Set packer
L O-298 S3 Logging
M O-011 S5 Logging
M O-025 S5 Logging
M O-031 S5 Injector, set packer
M O-029 S5 Logging
M O-034 S5 Injector
M O-047 S5 Logging
M O-016 S5 Logging
M O-010 S5 Logging
1 A STC 407.65 185.60
2 B STC 388.6 185.60
3 C STC 116.68 98.50
4 D STC 190.95 164.40
5 E STC 196.56 172.20
6 F STC 190.17 148.40
7 G S3 139.75 116.80
8 H S3 129.71 114.10
9 I S3 144.67 124.60
10 J S3 308.74 259.80
11 K S3 180.61 155.70
12 L S3 116.09 98.60
13 M S5 113.44 94.50
2,623.62 1,918.80
Forecast (MBO)
TOTAL
No Pattern Layer
Rem. Reserves
Area (MBO)
0
60 154 294 420
544.5 648.3 721.9 725.8 689.5 620.6
0
10
20
30
40
50
60
70
80
90
100
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 2 3 4 5 6 7 8 9 10
YEAR
RATEOIL-FLUID-WATER
PRODUCTION &INJECTION FORECAST2 PATTERN PER YEAR
BOPD
%WC

5. i
FOREWORD
This Book ‘SUBSURFACE EVALUATION FULL SCALE EOR WATER FLOODING A - M
FAULT ANTICLINE SHALLOW SAND MATURE RESERVOIR (O field – South
Sumatera basin)’ is an evaluation that was developed based on the map 13 patterns
water flooding from my discussion with my colleague. The A - M Water flooding consist
of 13 patterns from A to M pattern, The reserves calculations A - M Water flooding
performed by volumetric equation and the Forecast production estimation are made in
accordance with the assumption on the pilot water flooding O-107 well.
This book is Preliminary Evaluation of Full scale EOR Water flooding that could be used
as guidelines for further development of The O field, Reservoir simulation could be done
with trial error by reservoir engineer to obtain reserves and forecast production more
reliable. This document assumes the development based on the ability of the Operator
to perform operations water flooding pattern at least 2 pattern per year, so that within a
period of six years is expected to gain at least 50% of 648 BOPD and peak production
gain reach 725 BOPD at period of 8th
years where 14 pattern shall be running.
Surface facilities of The A - M Water flooding may be use a new gathering station or
upgrade existing gathering station where the facilities may provide 4000- 5000 bwpd to
be injected can be further developed by Facility Engineer or Civil Engineer and Process
Engineer and is expected to be optimal.
The purpose of compiling this book is to provide simple alternative method or work in
Evaluating Subsurface reservoir, and the data used with different name with Original
data and the exact location is untold. Suggestions and constructive criticism is expected
in the preparation of the next book.
ANDI ANRIANSYAH

6. ii
TABLE OF CONTENTS
FOREWORD ........................................................................................................................i
TABLE OF CONTENTS .......................................................................................................ii
1 INTRODUCTION .............................................................................................................1
1.1 The O Oilfield Summary ...........................................................................................1
1.2 Regional Geology.....................................................................................................2
2 GEOLOGY OF THE O FIELD ..........................................................................................8
2.1 Structure and Stratigraphy........................................................................................8
2.2 Petroleum System..................................................................................................10
2.3 Reservoir description..............................................................................................11
3 FESIABILITY A - M PATTERN WATERFLOODING........................................................14
3.1 A - M Pattern Water Flooding Area Selection..........................................................14
3.2 Detail Description Reservoir ...................................................................................16
3.2.a. Reservoir Characterisitic.............................................................................16
3.2.b. Characterisitic of Sedimen.........................................................................18
3.2.c. Reservoir physical property and heterogeneity...........................................19
3.2.d. Verification of Reserves..............................................................................21
3.3 Reservoir Engineering Design................................................................................26
3.3.a. Basic dan Prinsip Design............................................................................26
3.3.b. Selection and Combination of Multiple Layers Development......................27
3.3.c. Utilization Pattern Water flood wells and optimization.................................27
4 THE A - M PATTERN WATER FLOODING ..................................................................29
5 FORECAST PRODUCTION & INJECTION A - M PATTERN.........................................30
6 WATER SOURCE & QUALITY A - M PATTERN WATER FLOODING ..........................32
7. CONCLUSION & RECOMENDATION...........................................................................33
7.1 Conclusion .............................................................................................................33
7.2 Recomendation ......................................................................................................33
REFERENCES ..................................................................................................................34
APPENDIX
Well Correlation of A - M Pattern Water flooding ........................................................... A
Reserve Estimation of A - M Pattern Water flooding ...................................................... B
Forecast Production of A - M Pattern Water flooding .....................................................C
Surface Facility design of A - M Pattern Water flooding ................................................D
Well Diagram & Well History of A - M Pattern Water flooding........................................ E

7. iii
Contact : andy_83brur@yahoo.co.uk

8. ABOUT THE WRITER
Having more than 10 years of work experiences in Oil and
Gas Industry both exploration and development such as
Bandarjaya / Lampung III Project (at PT. Harpindo Mitra
Kharisama), Reevaluation of Diski Oil field - North Sumatra
basin (at TAC PEP – PKDP), and Preliminary Fractured
evaluation some oil fields (at PT. OPAC Barata-Kejora Gas
Bumi Mandiri), Evaluation for Klamono Block - Salawati Basin
and Evaluation for Tebat Agung Block - South Sumatera Basin (at Trada Petroleum Pte.
Ltd.), Operation of Kampung Minyak oilfield (at KSO Pertamina EP – PKM) and
Formation Evaluation of Tsimororo Field - Madagascar (at Lemigas), J1J3 Oil Fields -
NW Java basin (at ECC).
He was graduated from Institute Technology of Bandung, Geology Engineering
Department in 2006 as S.T. (Sarjana Teknik) or Bachelor degree in Geology. Before that
He was graduated from SMUN 2 Cimahi (Senior High School) in 2001, and from SLTPN
9 Cimahi (Junior High School) in 1998, also graduated from SDN KIHAPIT I (Elementary
school) in 1995.