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Introduction to the Gullfaks area

Introduction to the Gullfaks area. Petter Eltvik, Gullfaks RPBG NTNU 20.01.2010. IOR - Increased Oil Revovery hits the headlines. NEWS. Gullfaks facts Block 34/10 – the Golden block Only Norwegian partners Current owners: Statoil: 70 % (Operator) Petoro: 30 %

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Introduction to the Gullfaks area

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  1. Introduction to the Gullfaks area Petter Eltvik, Gullfaks RPBG NTNU 20.01.2010

  2. IOR - Increased Oil Revovery hits the headlines NEWS

  3. Gullfaks facts • Block 34/10 – the Golden block • Only Norwegian partners • Current owners: • Statoil: 70 % (Operator) • Petoro: 30 % • Field discovered: 1978 • Main field developed by three • concrete platforms • Production start: 1986 • Production start GFSAT: 1998 • Production start: 1999 • Gullfaks Sør, Gullveig, Rimfaks, • Gimle, Gulltopp, Skinfaks • Production from GFMAIN • exceed 2 billlion barrels

  4. Gullfaks area - installations Gullfaks main field Gullfaks satelite fields

  5. Structural Depthmap – Base Cretaceous Gullfaks main field data Area : 50 km2 Top Structure : 1700 m TVD Dipping : 0-20 West Oil-water contact : 1947 m TVD Initial pressue : 310 bar Bubblepoint pressure : 220 bar Initial temprature : 72 deg C Formation volume factor : 1,2 Oil viscosity : 1.2 cp Oil gravity : 36.9 API

  6. Gullfaks Reserves Estimates through time STOOIP: 3600 million bbls STOOIP: 3600 million bbls AMBITION: 2500 million bbls

  7. 1. Getting to a 50% oil recovery factor 2. Reversing field decline approacing 60% 3. IOR towards 70% recovery in 2030+?

  8. 4D seismic / monitoring Reservoir understanding Infill drilling Water and gas injection increased capacities Development of expected recovery 1986 1996 2000 2010 Statfjord 49,4 % 61,4 % 65,6 % 70 % Gullfaks 46,5 % 49,4 % 54,5 % 70 % Improved Oil Recovery is a team effort Smart wells AMEOR og EOR

  9. ..IOR is equivalient to a new big field Statoil has high ambitions Recovery factor: Subsea: 55% Platform: 70% 410

  10. Water injection from start Upgrading of water injection capacities 4D seismic and inversion Tracers Hydraulic fracturing in low perm reservoirs WAG (Water alternating gas) injection ”Huff and puff” gas injection Extensive exploration activity within drilling reach from platforms => new volumes Sand control in most wells ”Designer wells” (horizontal, 3D) Extended reach drilling (10 km) Monobore completions DIACS -”Smart wells” Multilateral wells (ML) Coiled Tubing drilling (CT) Through tubing drilling (TTRD) Rig assisted snubbing (RAS) Underbalanced drilling (UBD) Expandable liners IOR Measures at Gullfaks NPD IOR award for 2004

  11. TIME-LAPSE (4D) SEISMIC 1985 1999 Principle of 4D acquisition Example from Gullfaks field

  12. Well targets Gullfaks in the past and present; Steak vs. ragu Gullfaks

  13. Gullfaks C B A D Gullveig K E F M G L Gullfaks Sør N H Gassled J Skinfaks I Rimfaks N5 Gullfaks Satelites production system on the seabed C B A

  14. Toolboxes for drilling and repair of wells • Drilling rig for drilling and heavy workovers • Light Well Intervention (LWI) vessel • for lighter operations

  15. Thank you Presentation title Petter Eltvik Lead reservoir engineer RDBG petel@statoil.com, tel: +47 91 82 09 39 www.statoil.com

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