Transcript APEGGA
Northern Pipelining & Practical Experience Presentation to: APEGGA April 21, 2005 Calgary 1 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 2 Quick Facts Enbridge (NW) Pipeline System Inuvik Norman Wells Wrigley Ft. Simpson • • • • • 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 Zama 3 Quick Facts Enbridge (NW) Pipeline System • 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. Aerial View of Norman Wells • Remote Operations from Edmonton 4 “Northern” Pipeline Challenges Inuvik Unique “Northern” P/L Issues • Capital Cost • Geography and Remote Access • Permafrost Norman Wells Wrigley Ft. Simpson Zama Enbridge Experience Applied to Future Development • Proven sub-surface construction in permafrost • Proven methods of monitoring pipeline integrity 5 Norman Wells Successes: Design Innovation • Operating temperatures • Limit States Design – lower cost – strain limit 0.5% • Integrity monitoring 6 Norman Wells Successes: Permafrost Challenges Met • Design • Environmental/ Geotechnical Ice Rich – Right of Way – trenching 7 Norman Wells Successes: Slopes – Then and Now • Design • Environmental/ Geotechnical 1984 1997 – Right of Way – trenching – slope stabilization 8 Experience: Permafrost 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 Map and Diagram from Geological Survey of Canada website 9 Norman Wells Successes: Dealing with Ice • Design • Environmental/ Geotechnical – Right of Way – trenching – slope stabilization – thaw settlement / frost heave Ice lens 10 Inertial Inspection Runs – GEOPIG % Strain vs Time for Slope 92 3.5 3 Strain 2.5 2 1.5 1 0.5 0 1988 1990 1992 1994 1996 1998 2000 Year 11 Integrity Management in Permafrost • Geo-Pig 12 Maintenance Activity – Pipe Replacement 13 Maintenance Activities Maintenance Activities Refilling Propane Tanks Backfilling ditch subsidence Placing rock rip rap Erosion control Reseeding/revegetation Overturning/cooling wood chips Crib repairs Brushing ROW Pipeline maintenance Stockpiling sandbags & granular material 85/86 86/87 87/88 88/89 89/90 Lenth of Ditchline Backfilled Length (km) 60 50 40 48 37 30 20 10 0 1986 1987 4 2 1988 1989 Year 14 Maintenance Activities to Present Maintenance Activities ILI KP 0 to KP 336 ILI KP 336 to KP 586 ILI KP 586 to KP 869 Filling voids in wood chip cover Installation of additional instrumentation Forest fire impact remediation Pipeline repairs Bathymetric surveys 90/91 91/92 92/93 93/94 94/95 95/96 96/97 97/98 98/99 99/00 00/01 Note: ILI = In-Line Inspection 15 Monitoring Activities Activity Frequency/Monitoring Year 1998 1999 2000 2001 2002 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 Norman Wells to Zama Norman Wells to Wrigley Note 2 Norman Wells to Mackenzie Highway Norman Wells to Wrigley Norman Wells to Zama Visual Reconnaissance Inertial Geometry Tool (GEOPIG) 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. 16 Reporting to Regulators • Annual Reports – Operations & Maintenance Activities – Condition of Pipeline – Terrain Monitoring – Slope Monitoring and Performance – Operations & Monitoring Program – Right-of-way Assessment 17 Pipeline Maintenance • Hauling propane to remote area valve sites. 18 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. 19 Questions 20