Sin ttulo de diapositiva

1
MEDGAZ THE ULTRA DEEPWATER PIPELINEJay
Chaudhuri - Medgaz S.A.Don MacKinnon - J.P.
Kenny Ltd.
OPT Amsterdam, 25 Feb. 2004
2
Iberias gas demand and system capacity
NB Non-Enagas terminals include Bilbao,
Sagunto, Reganosa and Sines (Portugal).
Source- The Challenges for Iberian
Infrastructure Wood Mackenzie, Nov. 2003
3
Spain Peak Day Supply and Demand
() Includes available LNG storage in excess of
contracted LNG volumes
Source- The Challenges for Iberian
Infrastructure Wood Mackenzie, Nov. 2003
4
Iberian Energy Overview

• Iberias fast growing energy market poses
  challenges to the existing infrastructure
• Manufacturing growth and need to switch to Kyoto
  Protocol friendly fuels is increasing gas demand
  at 13 compound rate
• There are a number of gas and power
  infrastructure projects underway
• Delays in increasing infrastructure capacity will
  harm the development of the Iberian energy market
  in the short to medium term and growth potential
  of the economy
• Average to peak capacity margin lower than OECD
  average

5
MEDGAZ Project Partners
TOTAL 12
SONATRACH 20
ENDESA 12
CEPSA 20
GdF 12
IBERDROLA 12
BP 12
MEDGAZ PARTNERS OCTOBER 2003
6
MEDGAZ Pipeline
7
OVERVIEW

• MEDGAZ pipeline scheduled to start operation in
  2007
• Designed to deliver 16 BCM/Y of gas to the
  Iberian peninsula and Europe via twin 24 inch
  dia. pipelines
• Ultra deepwater pipelines will link Algerian and
  Spanish gas networks across the Alboran Sea
  traversing the abyssal plain at a maximum water
  depth of 2155m
• Proposed pipeline route is characterised by
• - steep slopes on either side of the Alboran Sea
  (lt14 degrees)
• - quarternary clay soil for most of the
  deepwater section
• - stable seabed
• - non-critical geohazards

8
MEDGAZ Pipeline System

• 2 nos. 24 inch diameter offshore pipelines
  connecting Beni Saf in Algeria, to a landing
  point near Almería in Spain, approximately 200 km
  long, to be constructed in 2 phases
• The pipeline system includes the compressor
  station at Beni Saf and the receiving terminal
  near Almería before entry to the Spanish gas grid
• Phase 1 East pipeline 24 diameter and short
  onshore section for the second West pipeline
  Capacity 10.5 BCM/Yr.
• Phase 2 West pipeline 24 diameter Total
  Capacity of twin lines 16 BCM/Yr.

9
Water Depth Profile
10
Design Data
Gas Flow Build-up Rates
Design Pressure 250 barg _at_ LATMaximum Design
Temperature 60 Deg CMinimum Design Temperature
-10 Deg C
Design Code DnV OS F101Pipe Material Grade
SAWL 485 I DUFPipe Wall Thicknesses 22.3 /
28.0 / 30.2mm
11
Survey Campaign

• 2002 03 Survey Campaigns
• Geophysical survey of the offshore route with the
  HUGIN AUV
• Environmental and flora/fauna survey both onshore
  and offshore Spain and Algeria
• Nearshore geophysical survey down to 25m isobath
• Onshore survey at the landfalls in Algeria and
  Spain
• 2004 Survey Programme
• High resolution seismic survey of critical slopes
  in deepwater for further geohazard studies
• AUV/ROV bathymetry, video and magnetometer
  surveys
• Seabed sampling for benthic characterisation

12
Offshore Routing

• The routing from the Phase 1 engineering work
  was further refined during FEED using the recent
  survey information. Routing criteria were to
• Minimise environmental impact
• Minimise pipeline route length and heading
  changes
• Avoid seabed obstructions
• Avoid geo-hazards
• Minimise the number of crossings
• Ensure pipelay feasibility by both S and J-lay
  vessels
• Minimise spanning
• Minimise locations of high stress and potential
  upheaval initiators

13
Offshore Routing Summary

• Offshore route length 197.65km
• Maximum water depth 2155m (49 gt 1000m)
• 17 pipeline curves
• 5 in-service cable crossings (all gt 1000m)
• 1 geological fault crossing at KP 74 Yusuf
  Fault
• Critical area KP71 - KP77 Steep Slopes (14
  degrees)
• Approximately 95 of the route is at less than 4
  degrees slope

14
Routing on Algerian Slope

• Critical Area KP 71.5 to 77 Habibas Escarpment
• 1350 m to 1850 m water depth
• 6 to 8 degree regional slope - locally 12 to 14
  at canyon break of slope

15
Seabed Gradient on Spanish Slope
16
Geotechnical Surveys

• A comprehensive geomorphology and geo-hazard
  desktop study was performed by CSIC in 2002. The
  results of the study were used to select a number
  of piston core locations at critical areas on the
  route
• The geotechnical investigation by Fugro in
  2003 comprised sampling and in-situ testing at
  more than 130 locations along the pipeline route
  including
• Piston and boxcore samples
• Cone penetration tests
• Seismic cone penetration tests
• In-situ vane tests
• T-bar tests
• Seawater temperature profiles and chemical
  laboratory tests
• Advanced lab testing including static and cyclic
  direct simple shear test and age dating

17
Soil Characterisation
18
Soil Characterisation
19
Geo-Hazard Assessment

• Based on the results of the geotechnical survey
  and the study by
• CSIC a geo-hazard assessment of the route was
  performed
• The work included
• Seismic Hazard Assessment
• Site Response Analysis
• Slope Stability Mapping

20
BATHY-MORPHOLOGICAL FEATURES
Source CSIC
21
Seismotectonic Model and Earthquake Distribution
Source CSIC
22
Slope Stability

• The level of confidence in the selected route has
  been significantly enhanced by the inclusion of
  the latest soil data and conclusions from the
  earthquake modelling as input for the assessment
  of slope stability
• Design parameters have benefited from a
  comprehensive geotechnical programme and the
  derivation of a reliable design soil profile
• The critical slopes near the pipeline are found
  to be stable in the static condition and for the
  200 and 400 year earthquakes

23
Pipelay Analyses

• Extensive static and dynamic pipelay analyses
  were performed including estimation of the
  fatigue damage and additional fatigue damage
  attributed to vortex induced vibrations on the
  suspended catenary
• The FEED design concluded that installation of
  the pipelines by both S and J lay vessels is
  feasible

24
Technical Challenges

• The following technical challenges have been
  addressed
• Thermal expansion at the Algerian landfall
• The 60 deg C design limit and 250 barg pressure
  at the Algerian landfall results in a large axial
  driving force in the pipe wall. Solutions include
  intervention or snake lay to prevent the pipeline
  from buckling and overstressing.
• The use of SAWL 485 I DUF (X70) material for the
  pipeline
• Tight tolerances on pipe Out of Roundness body
  and ends e.g. 1
• UOE fabrication factor of 0.9

25
Environmental Challenges

• The following environmental challenges have been
  addressed
• Minimise environmental disruption during
  construction, twin 24 inch short onshore sections
  and offshore tails will be installed in both
  Algeria and Spain during Phase 1 construction.
  When the second offshore pipeline is installed
  there will be no disruption onshore.
• The offshore pipeline corridor width has been
  minimised whilst allowing sufficient space for
  installation of the second line at a later date
• Sensitivity of scheduling to ensure no summer
  working in the beach areas
• Trenching has been minimised to reduce seabed
  disturbance

26
MEDGAZ Global Schedule
MEDGAZ
2006
2007
2002
2003
2004
2005
1H
2H
1H
2H
1H
2H
1H
2H
1H
2H
1H
2H
Feasibility Study
Surveys Geotechnical Investigations
Route Confirmation and FEED studies
ROW, Permits EIA
Final Investment Decision (FID)
Project Execution
First Gas
FEED Front End Engineering Design
27
Conclusions

• The pipeline route has been selected based on
  extensive geophysical and geotechnical surveys
  including rigorous geo-hazard assessment
• Further confirmatory surveys are scheduled for
  2004
• Recent technological advances in deepwater
  pipelay and repair have demonstrated the
  feasibility of installing and maintaining the
  MEDGAZ pipeline
• The pipeline design has been developed to suit
  installation by both S and J-lay methods

28
Acknowledgements

• The authors would like to thank the following
  companies which have participated in the
  technical execution of Medgaz Project to-date
• CC Technologies Inc.
• Snamprogetti SpA
• CSIC
• Fugro bv
• INTEC Engineering (UK) Ltd
• Ramboll-Initec
• DAppolonia SpA
• GAS Srl