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ETAP
June 29th ,2015
PresidentMr.Jamel Abdennaceur
Ouali
PETROFAC TutorMr. Abdellatif TLILI
Academic tutorMr.Riadh Ahmadi
ReviewerMr.Monji Felhi
NATIONAL ENGINEERING SCHOOL OF SFAX
DissertationTo Obtain
National Engineer Diploma in Geology
CHERGUI RESERVOIR STUDY AND MASS BALANCE DETERMINATION USING SOFTWARES AND SPREAD-SHEETS
Presented By:
Ines MASMOUDI
Figure 1
ETAPPLAN
• Project Context
• Chergui Field Localization
• Geological Overview
• Wells Modeling using Prosper Software
• Reservoir Modeling using Mbal Software and Spread-sheets
• Total System Modeling using Gap Software
• Conclusion and Perspectives Figure 2
ETAP
Project ContextFigure 3
ETAPProject Context
Our study consists in establishing a global system modeling starting from the reservoir till separators in order to interpret reservoir simulation and forecast production in term of system potential and optimum rate.
MBALPROSPER
GAP
• Reservoir Modeling• Mass Balance Method
• Wells Modeling• Gas Rate Estimation
Total System Production ForecastFigure 4
ETAP
Chergui Field LocalizationFigure 5
ETAPETAP Chergui Field Localization
High Arch
Kerkennah Islands Sfax city
Seaway
Chergui concession
CPF petrofac
Figure 6
ETAP
Geological OverviewFigure 7
ETAPGeological Overview
Petroleum System
Source Rock Seal Rock
Reservoir Rock
• Bahloul Member (Cenomanian, Turonian; Late Crateceous) • Boudabbous Fm. (Yprisian Lutetian; Eocene)
Both of them are suspected to be source rock for our reservoir. because they have already reached the maturity interval.
• Souar Fm. (Late Eocene),• Average Thikness : 800m,• Mainly formed by Claystone,• Limestone Member divided this formation on Upper claystone and lower
claystone
• Reineche Member • Average thikness : 10m• Formed by Nummilitic Limestone
Figure 8
ETAPGeological Overview
Major NW-SE Fault; Separating Tank32 andTank38
Tank 32
Tank 38
CRG-8CRG-1
CRG-3
CRG-6
CRG-5
CRG-4
CRG-2
Tank 32 :• CRG-1• CRG-3• CRG-8
Tank 38 :• CRG-5• CRG-6
Seismic top Reineche Depth Map
Figure 9
ETAP
Wells Modeling using PROSPER Software Figure 10
ETAPWells modeling using Prosper Software
Prosper Work Flow
1. Model Construction
2. Well Test Analysis
3. Estimation of the Gas Flow Rate
Defining the Well type and the reservoir fluid
Defining the PVT Data
Defining the Equipment Data
Generate IPR Curve
Generate VLP Curve
Figure 11
ETAP
CRG-1A Work Flow
Wells modeling using Prosper Software
1. Model Construction
Defining the Well type and the reservoir fluid
Defining the PVT Data
Defining the Equipment Data
Generate IPR Curve
Generate VLP Curve
Figure 12
ETAPWells modeling using Prosper Software
2. Well Test Analysis
CRG-1A Work Flow
1. Model Construction
Figure 13
ETAP
3. Estimation of the Gas Flow Rate
CRG-1A Work Flow
Wells modeling using Prosper Software
2. Well Test Analysis
9.2
CRG-1A Deliverability Curve
1. Model Construction
Figure 14
ETAP
CRG-1AReservoir Pressure : 92 BargReservoir Permeability : 35.2 mDSkin Factor : 0
Wells modeling using Prosper Software
Well Deliverability
Curves
9.19
CRG-3Reservoir Pressure : 99 BargReservoir Permeability : 6 mDSkin Factor : 0.5
1.94
CRG-5Reservoir Pressure : 106 BargReservoir Permeability : 20 mDSkin Factor : 1.5
10.05
CRG-6Reservoir Pressure : 105 BargReservoir Permeability : 6 mDSkin Factor : 1.5
2.46
CRG-8Reservoir Pressure : 99 BargReservoir Permeability : 40 mDSkin Factor : -1
11.2
Figure 15
ETAPWells modeling using Prosper Software
Figure 16
ETAP
Reservoir Modeling using Mbal Software and two Spread-Sheets
Figure 17
ETAP
Reservoir Modeling using MBAL Software and Spread-Sheets
MBAL Work Flow
1. Model Construction
2. Production History Simulation
3. Production Forecast
Defining the system summary of Tanks
Defining the PVT Data
Defining Tanks Parameters
Figure 18
ETAP
Tank 32 MBAL Work Flow
1. Model Construction
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 19
ETAP
Tank 32 MBAL Work Flow
1. Model Construction
2. Production History Simulation
3. Production forecast
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 20
ETAP
Tanks resultsTANK 32
Date Prediction Curve
725 Psig ; 06/10/2017
Cumulative Gas Prediction Production Curve
725 Psig ; 1.8 BSm3
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 21
ETAP
MBAL OutputsTANK 38
Date Prediction Curve
725 Psig ; 20/05/2023
Cumulative Gas Prediction Production Curve
725 Psig ; 1.05 BSm3
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 22
ETAP
First Spread-Sheet Outputs
TANK 32
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 23
ETAP
First Spread-Sheet Outputs
TANK 38
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 24
ETAP
TANK 32
Second Spread-Sheet Outputs
Gas Recovery factor (%) 69,4Recoverable reserves (Bm3) 1.51Original gas in place (Bm3) 2.18Reservoir volume (AC.FT.) 112 920
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 25
ETAP
TANK 38
Second Spread-Sheet Outputs
Gas Recovery factor (%) 70.6Recoverable reserves (Bm3) 1.48Original gas in place (Bm3) 2.11Reservoir volume (AC.FT.) 107 453
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 26
ETAP
Comparison Between MBAL Software Results and Two Spread-Sheets
TANK 32
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 27
MBAL results First spread sheet
results
Second spread sheet
results
Initial Gas In Place (BSm3) 2.62 2.87 2.18
Recovery Factor 68.7% 65.85% 69.4%
Current Cumulative Gas produced
(BSm3)
1.15 1.15 1.07
Remaining Gas Reserves (BSm3) 1.47 1.77 1.11
Total Cumulative Gas In the end date
of natural production (BSm3)
1.80 1.89 1.51
Depletion Date 21/12/2020 19/07/2024 None
Date of Natural Production End
(725 Psig)
06/10/2017 24/06/2019 None
MBAL results First spread sheet
results
Second spread
sheet results
Initial Gas In Place (BNm3) 1.49 1.9 2.23
Recovery Factor 70% 67% 70,6%
Current Cumulative Gas produced
(BNm3)
0.65 0.65 0.79
Remaining Gas Reserves (BNm3) 0.89 1.24 1.44
Total Cumulative Gas In the end date of
natural production (BNm3)
1.05 1.28 1.56
Depletion Date 08/05/2032 19/07/2024 None
Date of Natural Production End
(725 Psig)
20/05/2023 24/06/2019 None
MBAL is a reliable model so we are going to use its outputs in the next part.
TANK 38
ETAP
Although, MBAL gives us a constant gas rate 24 MMscf/d for Tank 32 and 4.6 MMscf/d for Tank 38 based on initial gas reserves
Reservoir Modeling using MBAL Software and Spread-Sheets
Figure 28
ETAP
Total System Modeling using GAP Software Figure 29
ETAPTotal System Modeling using GAP Software
GAP Work Flow
1. Build the GAP Network
2. Run Prediction
Draw the GAP Network
Define the Reservoir
Define the Wells
Define the Surface Equipments
Figure 30
ETAP
GAP Work Flow
1. Build the GAP Network
Draw the GAP Network
Total System Modeling using GAP Software
Figure 31
ETAP
GAP Work Flow
1. Build the GAP Network
Total System Modeling using GAP Software
Figure 32
ETAP
GAP Work Flow
2. Run Prediction
1. Build the GAP Network
Total System Modeling using GAP Software
Figure 33
ETAP
GAP Outputs
Total System Prediction Production
CHR-3 re-opening
CHR-6 re-opening
Total System Modeling using GAP Software
Figure 34
14.188
28.383
ETAP
GAP Outputs
Wells Results
CRG-1A CRG-3 CRG-5 CRG-6 CRG8
0
1
2
3
4
5
6
7 6.302
0.634
3.646
0.593
5.453
Gas wells contribution
Gas
Rat
e (M
Msc
f/d)
38 %
4 %
22 %
33 %
3 %
Total System Modeling using GAP Software
Figure 35
ETAP
Conclusion and PerspectiveFigure 36
ETAP
According to PROSPER, MBAL and GAP Softwares the final results indicates that the agreement condition between Petrofac and STEG
about the minimum Gas flow rate (16.42 MMscf/d) will be reached at 28/09/2016.
Conclusion and Perspective
2015 2016 2017
2015 2016 2017
Petrofac should find a quick solution to respect its engagement after the deadline of 2016. We suggest drilling new wells as far as possible, if it is not possible due to unrest and strikes, the urgent solution to satisfy
the contract with STEG is to install a Turbo Compressor in the inlet Manifold by the end of 2015.
Figure 37
ETAP
Thank You For Your Attention
A SPECIAL DEDICATE TO :
My Parents
Mr. Abdellatif Tlili
Mr. Riadh Ahmadi
My Sisters : Yossra & Imen
My Husband
My FriendsFigure 38
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