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Northern Pipelining & Practical Experience

Presentation to:

APEGGAAPEGGAApril 21, 2005

Calgary

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Topics

• Enbridge (NW) Pipeline System Overview• “Northern” Pipeline Challenges and

Successes• Maintenance and Monitoring• Inspection and Integrity Management• Reporting• The people that make it possible

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Quick Facts

• Constructed: 1983 – 1985• Diameter: 323.8 mm• Length: 869 km• Design: Limit States• Features:

– 140 defined water crossings

– 2 major rivers

– 150 significant slopes

– ambient temperature pipeline

• Design Pressure: 9930 kPa

Inuvik

Norman Wells

Zama

Ft. Simpson

Wrigley

Enbridge (NW) Pipeline System

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Quick Facts

• Throughput: 30,000 BPD (4,800 m3/d)• One shipper from Norman Wells to KP 839.2

Two shippers from there to KP 869 (Zama)• Three (3) Pump Stations:

– 1 natural gas powered (NW)

– 2 diesel powered (WG & MC)

• Crude Characteristics:– Density = 827 kg/m3

– Pour Point = -50° Celsius

– RVP < = 103 kPag

– Viscosity = 2.0 cSt.

• Remote Operations from Edmonton

Enbridge (NW) Pipeline System

Aerial View of Norman Wells

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“Northern” Pipeline Challenges

Unique “Northern” P/L Issues• Capital Cost• Geography and Remote Access• Permafrost

Enbridge Experience Applied to

Future Development• Proven sub-surface

construction in permafrost• Proven methods of monitoring

pipeline integrity

Inuvik

Norman Wells

Zama

Ft. Simpson

Wrigley

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Norman Wells Successes: Design Innovation

• Operating temperatures

• Limit States Design– lower cost– strain limit

0.5%

• Integrity monitoring

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Norman Wells Successes: Permafrost Challenges Met

• Design• Environmental/ Geotechnical

– Right of Way – trenching

Ice Rich

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Norman Wells Successes: Slopes – Then and Now

• Design• Environmental/

Geotechnical– Right of Way– trenching– slope

stabilization

1984 1997

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Experience:Permafrost

Map and Diagram from Geological Survey of Canada website

Region requiring design consideration for permafrost Conventional pipeline design and construction

Area of sporadic permafrost that requires minimal pipeline

design and construction considerations for permafrost

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Norman Wells Successes:Dealing with Ice

• Design• Environmental/

Geotechnical– Right of Way– trenching– slope

stabilization– thaw

settlement / frost heave

Ice lens

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Inertial Inspection Runs – GEOPIG

% Strain vs Time for Slope 92

0

0.5

1

1.5

2

2.5

3

3.5

1988 1990 1992 1994 1996 1998 2000

Year

Str

ain

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Integrity Management inPermafrost

• Geo-Pig

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Maintenance Activity – Pipe Replacement

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Maintenance Activities

Lenth of Ditchline Backfilled

48

37

4 20

10

20

30

40

50

60

1986 1987 1988 1989

Year

Len

gth

(km

)

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Maintenance Activities to Present

MaintenanceActivities

90/91 91/92 92/93 93/94 94/95 95/96 96/97 97/98 98/99 99/00 00/01

ILI KP 0 to KP336

ILI KP 336 to KP586

ILI KP 586 to KP869

Filling voids inwood chip cover

Installation ofadditionalinstrumentation

Forest fire impactremediation

Pipeline repairs Bathymetricsurveys

Note: ILI = In-Line Inspection

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Monitoring Activities

Activity Frequency/Monitoring Year

1998 1999 2000 2001 2002

Visual Reconnaissance Weekly Weekly Weekly Weekly Weekly

Detailed Reconnaissance September September September September September

Thaw Depth Investigation October Note 1 October Note 1 October

Instrumentation Readings Note 2 Note 2 Note 2 Note 2 Note 2

Inertial Geometry Tool(GEOPIG)

Norman Wellsto Zama

Norman Wellsto Wrigley

Norman Wellsto Mackenzie

Highway

Norman Wellsto Wrigley

Norman Wellsto Zama

Notes:1. Unless an ongoing review of instrumentation and other data indicates a need for thaw probing at a particular slope, no probing

will be conducted in odd numbered years.2. Instrumentation within 1 meter of the pipeline, for a distance of 140 km from Norman Wells, will be read on a monthly basis.

Remaining instrumentation will be read on a monthly or quarterly basis.

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Reporting to Regulators

• Annual Reports– Operations &

Maintenance Activities– Condition of Pipeline– Terrain Monitoring– Slope Monitoring and

Performance– Operations &

Monitoring Program– Right-of-way

Assessment

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Pipeline Maintenance

• Hauling propane to remote area valve sites.

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Field Personnel

• Employees are permanent residents of the communities of Norman Wells and Ft. Simpson.

• They provide significant contributions to the quality of life in the communities through their volunteer activities.

• Successful and enduring positive northern relationships are built and maintained on the basis of mutual honesty, respect and trust.

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Questions