Earthing System Study

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY

00

07-NOV-17

AFC

APPROVED FOR CONSTRUCTION

ST

NIM

MSELMI

C

27-OCT-17

IFR

ISSUED FOR REVIEW

ST

NIM

MSELMI

B

25-SEP-17

IFR

ISSUED FOR REVIEW

RAE

NIM

MSELMI

A

18-SEP-17

IDC

ISSUED FOR IDC

RAE

NIM

MSELMI

REV

DATE

STATUS

ISSUE PURPOSE

ISSUED BY

REVIEWED BY

APPROVED BY

COMPANY DOCUMENT ATTRIBUTES Company Code

Contract Territory Code

Originator Code

Facility Code

System Code

Discipline

Document Type

Sequence Number

8015

0151

EPPM

12

890

EL

CC

10001

This document is property of the COMPANY and it shall not be disclosed to third parties, or reproduced, without permission of the COMPANY.

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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DOCUMENT REVISION HISTORY SHEET REV

STATUS

DATE ISSUED

UPDATE / AMENDMENT DETAILS

A

IDC

18-SEP-17

ISSUED FOR IDC

B

IFR

25-SEP-17

ISSUED FOR REVIEW ISSUED FOR REVIEW

C

00

IFR

AFC

-

PAGE 7 ITEM 6: “8 NOS. OF EARTH PITS (19MM DIA. & 3M LONG) ARE REQUIRED TO BE INSTALLED IN WELL PAD 11/1A AREA.” CHANGED “8 NOS. OF EARTHING RODS (19MM DIA. & 3M LONG) WITH THEIR INSPECTION PITS ARE REQUIRED TO BE INSTALLED IN WELL PAD 11/1A AREA.”

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PAGE 7 ITEM 6: PARAGRAPH DELETED: “DURING CONSTRUCTION, IF THE SITE MEASURED OVERALL EARTH RESISTANCE VALUE IS MORE THAN 1 Ω AFTER INSTALLATION OF THE NEW GRID AROUND THE NEW FACILITY, THEN ADDITIONAL EARTH ELECTRODES SHALL BE INSTALLED BY THE CONTRACTOR TO MAKE THE OVERALL EARTH RESISTANCE VALUE LESS THAN 1 Ω.”

27-OCT-17

07-NOV-17

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PAGE 5 ITEM 3: “SHORT CIRCUIT STUDY WP-11/1A_ 8015-0151-EN0512-000-EL-RP-00001” MODIFIED “SHORT CIRCUIT CALCULATIONS_ 8015-0151-EPPM-12-800-EL-CC-20002.

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PAGE 20: “OVERALL GROUNDING PLAN”ADDED TO ANNEXURE D PAGE 21: ANNEXURE E: ADDED.

APPROVED FOR CONSTRUCTION

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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CONTENT 1. INTRODUCTION .................................................................................................................. 4 1.1 General ............................................................................................................................... 4 1.2 Document Purpose ............................................................................................................ 4 1.3 Definitions and abbreviations .......................................................................................... 4 1.3.1 Definitions .................................................................................................................. 4 1.3.2 Abbreviations .............................................................................................................. 5 2. REFERENCES STANDARDS AND CODES ..................................................................... 5 3. REFERENCE DOCUMENTS ............................................................................................... 5 4. CALCULATION BASIS ........................................................................................................ 6 5. EARTHING CALCULATION ............................................................................................. 6 6. CONCLUSION ....................................................................................................................... 7

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

1.

INTRODUCTION

1.1

General

Rev.: 00 Status: AFC Page:

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The West Qurna-2 Mishrif Oil field area (including Well pads, Central Processing Facilities, Gas Treatment Facilities, Euphrates River Water Intake, Accommodation Operator Camp and Waste Management Complex) is located in Southern Iraq, near the Euphrates and Tigris confluence. The West Qurna -2 Project was originally divided into three phases:  Phase 1- Crude Oil Production Capacity of 150,000 BOPD plus 15%. In this phase, three (3) crude oil trains are in operation. No Gas Treatment Plant is provided.  Phase 2- Crude Oil Production Capacity of 400,000 BOPD plus 15%. In this phase, eight (8) crude oil trains in operation and one (1) train spare.  Phase 3- Crude Oil Production Capacity of 550,000 BOPD. In this phase, ten (10) crude oil trains will be in operation and one (1) train as spare. Each of the new Oil trains will be designed for a capacity of 50,000 BOPD+15% margin. At this stage of the project, WQ-2 Mishrif CPF Oil production has reached a capacity of 450,000 BOPD through (8+1) oil trains including the design margin. Phase 1 & 2 mentioned above are Completed. Phase-3 mentioned above to achieve 550KBOPD will be executed in future. COMPANY has decided to first maintain the 400KBOPD with the addition of new oil wells and water injection without CPF Expansion of additional oil trains. In order to maintain 400,000 BOPD plus the 15% design margin, COMPANY has decided to expand the well pads and gathering system. To maintain the target production, West Qurna 2 Oil Field, Mishrif Well Pads and Gathering System Expansion is envisaged. This Project includes development of new Well Pad 11/1A, gathering line together with various appurtenances and associated interface works. Eight (8) production wells were already drilled at Well Pad 11/1A and are ready for hook-up. In order to achieve the production early from Well Pad 11/1A and deliver to existing Gathering system, Well Pad 11/1A will be executed in two phases:  Phase-1 (Temporary Hook-Up) to facilitate oil production with minimum required FACILITIES via temporary power supply.  Phase 2 (Permanent): All other required FACILITIES to ensure the operation via permanent power supply. 1.2

Document Purpose

This document covers the Earthing calculation for the new facilities in Well Pad #11/1A at WEST QURNA-2 (PHASE 2). 1.3

Definitions and abbreviations 1.3.1 Definitions

Throughout this Document the following definitions shall apply:

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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PROJECT:

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

COMPANY:

Lukoil Mid-East Limited (LMEL)

CONTRACTOR:

EPPM/MSK Consortium

SUPPLIER:

Any person or company engaged by the CONTRACTOR to manufacture and/or supply Installation Equipment or other equipment and material for the PROJECT

“Must”:

It signifies a legal or statutory requirement

“Shall”:

It signifies a requirement made mandatory by this specification

1.3.2 Abbreviations The following abbreviations are used in this document: AC

Alternating Current

EPC

Engineering, Procurement, Construction

IEC

International Electrotechnical Commission

IEEE

Institute of Electronic and Electrical Engineers

2.

REFERENCES STANDARDS AND CODES

IEC (International Electrotechnical Commission) IEC 60364

Low Voltage Electrical Installations

IEEE (Institute of Electronic and Electrical Engineers) IEEE 80 3.

IEEE Guide for Safety in AC Substation Grounding

REFERENCE DOCUMENTS

TITLE

DOC. REF.

BASIS OF DESIGN

8015-0151-EPPM-12-000-AL-BD-00001

TECHNICAL SPECIFICATION FOR ELECTRICAL INSTALLATION

8015-0151-EPPM-12-800-EL-SP-00005

TECHNICAL SPECIFICATION FOR ELECTRICAL POWER AND CONTROL CABLES

8015-0151-EPPM-12-820-EL-SP-00001

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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TECHNICAL SPECIFICATION FOR EARTHING AND LIGHTNING PROTECTION SYSTEM

8015-0151-EPPM-12-880-EL-SP-00001

UNIT PLOT PLANS FOR WELL PAD 11/1A

8015-0151-EPPM-12-111-PI-DB-00003

SOIL INVESTIGATION REPORT

8015-0151-EPPM-00-000-CI-RP-00001

SHORT CIRCUIT CALCULATIONS

8015-0151-EPPM-12-800-EL-CC-20002

4.

CALCULATION BASIS

Following are the basis for carrying out the earthing calculation:  The section of an earth conductor (Amm2) is as per Eq. 40 of IEEE Std. 80-2000 section – 11 (Refer Annexure C).  Ground resistance of the grid conductor (R1) is as per Eq. 54 of IEEE Std. 80-2000 section – 14 (Refer Annexure C).  Ground resistance of the rod bed (R2) is as per Eq. 55 of IEEE Std. 80-2000 section-14 (Refer Annexure C).  Mutual ground resistance (Rm) between the rod bed and grid conductor is as per Eq. 56 of IEEE Std. 80-2000 section–14 (Refer Annexure C).  Total system resistance (Rg) is as per Eq. 53 of IEEE Std. 80-2000 section-14 (Refer Annexure C).  PRELIMINARY GEOTECHNICAL INVESTIGATION (Refer Annexure E) Assumption: the considered earth type for the Well pad 11/1A will be wet organic soil.  Soil resistivity value of 0.252 Ω m (Average Value) is considered in the calculation (Refer Annexure E).  Ground resistance requirement of 1 Ω is considered as per TECHNICAL SPECIFICATION FOR EARTHING AND LIGHTNING PROTECTION SYSTEM (Doc no. 8015-0151-EPPM-12-880-EL-SP-00001).  Earth electrode size considered for calculation is 19mm diameter, 3m long as per TECHNICAL SPECIFICATION FOR EARTHING AND LIGHTNING PROTECTION SYSTEM (Doc no. 8015-0151-EPPM-12-880-EL-SP-00001).  Grid Length considered for Well Pad #11/1A area is 316m (length) x 210m (width) as marked in the GENERAL PLOT PLANS FOR WELL PAD 11/1A attached in Annexure D.  Short circuit current of 28.83 KA is considered as per SHORT CIRCUIT CALCULATIONS (Doc no. 8015-0151-EPPM-12-800-EL-CC-20002).  The duration of Low voltage short circuit current is 0.7s. 5.

EARTHING CALCULATION

(See Annexure A) (See Annexure B)

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

6.

Rev.: 00 Status: AFC Page:

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CONCLUSION

According to the calculation results (in the two Annexures A and B) and the COMPANY standard, the section of the earth grid conductors shall be 70 mm2. 8 nos. of earthing rods (19mm dia. & 3m long) with their inspection pits are required to be installed in Well pad 11/1A area.

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

ANNEXURE A – EARTHING CONDUCTOR SIZING

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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1.0 Calculation of the section of grid conductors The principle adopted is to dimension the earth grid on the basis of the short circuit current fault value on the whole voltage levels HV/MV/LV. The size of the earth cable should be calculated based on the short circuit current. a) Fault Current The table below shows the different values of the fault currents deduced from the table existing in the SHORT CIRCUIT CALCULATIONS (Doc n. 8015-0151-EPPM-12-800-EL-CC-20002). Voltage (KV)

I”K (KA)

132

9.292

6.6

9.257

0.4

28.83

b) Calculation The table shows that the highest fault current is calculated on the 400V voltage level, it is evaluated at 26.24 KA in the main electrical substation. The minimum required section for an earth conductor is given by the following formula:

Input Data Required as per IEEE Std. 80-2000 section -11 I

28.83

Amm²

is the conductor cross section in mm²

Tm

1083

Ta

40

αr

is the rms current in kA

is the maximum allowable temperature in °C is the ambient temperature in °C

0,00393 is the thermal coefficient of resistivity at reference temperature Tr in 1/°C

ρr

1,72

is the resistivity of the ground conductor at reference temperature Tr in μΩ-cm

K0

234

1/αo or (1/αr) – Tr in °C

Tc

0,7

is the duration of current in s

TCAP

3,42

is the thermal capacity per unit volume from Table 1, in J/(cm3·°C) (further defined in 11.3.1.1)

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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Substituting the value: 1

Amm2 = 28.83 √(

3.42 234 + 1083 10000 ∗ 0.7 ∗ 0.00393 ∗ 1.72) ln( 234 + 40 )

Amm2 = 85.584 mm2 c) Section of the earth protection cable (SEP): In order to select a minimum cross-section of the protective conductor, a connection to the main earth grid is considered by means of two branch insulated copper conductors where the short circuit current will also be divided in the main grid. The size of the earth conductor is SEP =

Amm2 2

=

85.584 2

= 42.792 mm2

According to the calculation results, the size of each branch is 42.792 mm2. According to the COMPANY standard, the minimum section to be used is 70 mm2. 2.0 CONCLUSION We will consider for all areas that the section cross for main earthing grid, realized by bare copper conductor, will be 70 mm². However, the redundant connection, from the electrical switchgears 6.6KV and 0.4KV to the main earthing grid, will be performed by insulated copper conductors 70 mm².

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

ANNEXURE B - EVALUATION OF GROUND RESISTANCE

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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Input Data required as per IEEE Std. 80-2000 section -14 2a is the diameter of 70 mm² conductor in (m)

= 0.011 (11 mm)

[√ (a*2h)] where h=0.7 m is depth at which cable is buried

a' = 0.0877

Radius of earth rod in (m)

b = 0.0095

Length of one earth rod in (m)

Lr = 3

GRID Resistance Calculation No. of rods

nR = 33

Total length of 33 earth rods in (m)

L = 99

Soil resistivity at 1.5m depth in (Ω-m)

ρ = 0.252

Total length of earth conductor in (m)

Lc = 1 052

Area covered by earth grid in (m²)

A = 52 005

Coefficient (Curve-C; Length/Width Ratio=1.5)

k1 = 1.055

(Refer Annexure C)

Coefficient (Curve-C; Length/Width Ratio=1.5)

k2 = 4.5

(Refer Annexure C)

3.0 Calculation of Ground Resistance of Grid Conductors

Substituting the value: R1 Grid =

0.252 2 ∗ (1052) 1.055 ∗ (1052) [[ln ]+[ ] − 4.5] π (1052) 0.0877 √52005

R1 Grid = 0.0008 Ω 4.0 Calculation of Ground Resistance of the Rod Bed

Substituting the value: R2 Grid =

0.252 4 ∗ (3) 2 ∗ (1.055) ∗ (3) 2 [[ln ]−1+ [√8 − 1] ] 2π(8) ∗ (3) 0.0095 √52005

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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R2 Grid = 0.0027 Ω 5.0 Calculation of Mutual Ground Resistance Between Rod Bed and Grid Conductors

Substituting the value: Rm Grid =

0.252 2 ∗ (1052) 1.055 ∗ (1052) [ln [ ]+[ ] − 4.5 + 1] π(1052) 3 √52005

Rm Grid = 0.0006 Ω 6.0 Calculation of Total System Resistance

Substituting the value: Rg Grid =

(0.0008 ∗ 0.0027) − (0.0006)2 (0.0008 + 0.0027) − 2(0.0006)

Rg Grid = 0.0008 Ω 7.0 CONCLUSION As shown in the calculation results (refer Annexure B), total system resistance value of 0.0008 Ω is lower than standard requirement of 1 Ω as per COMPANY standard.

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

ANNEXURE C - IEEE STANDARD EXCERPTS

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

17 of 21

ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

ANNEXURE D – PLOT PLAN & OVERALL GROUNDING PLAN

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ENGINEERING, PROCUREMENT & CONSTRUCTION FOR PRODUCTION WELL PAD 11/1A AND ASSOCIATED GATHERING SYSTEM EXPANSION AT THE WEST QURNA (PHASE 2) CONTRACT AREA

EARTHING SYSTEM STUDY COMPANY Doc. No.: 8015-0151-EPPM-12-890-EL-CC-10001 CONTRACTOR Doc. No.: R1117-CLC-EL-01-101

Rev.: 00 Status: AFC Page:

ANNEXURE E – PRELIMINARY GEOTECHNICAL INVESTIGATION – WEST QURNA2

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