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ETAP June 29 th ,2015 President Mr.Jamel Abdennaceur Ouali PETROFAC Tutor Mr. Abdellatif TLILI Academic tutor Mr.Riadh Ahmadi Reviewer Mr.Monji Felhi NATIONAL ENGINEERING SCHOOL OF SFAX Dissertation To Obtain National Engineer Diploma in Geology CHERGUI RESERVOIR STUDY AND MASS BALANCE DETERMINATION USING SOFTWARES AND SPREAD- SHEETS Presented By: Ines MASMOUDI Figure 1

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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

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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

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Project ContextFigure 3

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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

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Chergui Field LocalizationFigure 5

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ETAPETAP Chergui Field Localization

High Arch

Kerkennah Islands Sfax city

Seaway

Chergui concession

CPF petrofac

Figure 6

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Geological OverviewFigure 7

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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

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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

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Wells Modeling using PROSPER Software Figure 10

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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

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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

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ETAPWells modeling using Prosper Software

2. Well Test Analysis

CRG-1A Work Flow

1. Model Construction

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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

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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

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ETAPWells modeling using Prosper Software

Figure 16

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Reservoir Modeling using Mbal Software and two Spread-Sheets

Figure 17

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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

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Tank 32 MBAL Work Flow

1. Model Construction

Reservoir Modeling using MBAL Software and Spread-Sheets

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Tank 32 MBAL Work Flow

1. Model Construction

2. Production History Simulation

3. Production forecast

Reservoir Modeling using MBAL Software and Spread-Sheets

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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

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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

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First Spread-Sheet Outputs

TANK 32

Reservoir Modeling using MBAL Software and Spread-Sheets

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First Spread-Sheet Outputs

TANK 38

Reservoir Modeling using MBAL Software and Spread-Sheets

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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

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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

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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

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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

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Total System Modeling using GAP Software Figure 29

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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

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GAP Work Flow

1. Build the GAP Network

Draw the GAP Network

Total System Modeling using GAP Software

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GAP Work Flow

1. Build the GAP Network

Total System Modeling using GAP Software

Figure 32

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GAP Work Flow

2. Run Prediction

1. Build the GAP Network

Total System Modeling using GAP Software

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GAP Outputs

Total System Prediction Production

CHR-3 re-opening

CHR-6 re-opening

Total System Modeling using GAP Software

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14.188

28.383

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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

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Conclusion and PerspectiveFigure 36

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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.

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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