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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