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Eksperter i Team – Gullfakslandsbyen 2009

Eksperter i Team – Gullfakslandsbyen 2009. Reservoar og IOR – oppgave 2, 3 & 5 Petter Eltvik, StatoilHydro UPN, Ledende reservoaringeniør Gullfaks området. Gullfaks Landsbyen 2009……. Fortsatt mye ugjort på Gullfaks……… IOR-potensialet tilsvarer et nytt stort satelittfelt

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Eksperter i Team – Gullfakslandsbyen 2009

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  1. Eksperter i Team – Gullfakslandsbyen 2009 Reservoar og IOR – oppgave 2, 3 & 5 Petter Eltvik, StatoilHydro UPN, Ledende reservoaringeniør Gullfaks området

  2. Gullfaks Landsbyen 2009……. • Fortsatt mye ugjort på Gullfaks……… • IOR-potensialet tilsvarer et nytt stort satelittfelt • Vurderer IOR prosjekter som kan bidra til fortsatt verdiskaping i denne rike provinsen • Krevende og utfordrende IOR-arbeid for å nå høye ambisjoner

  3. Structural Depthmap – Base Cretaceous Gullfaks reservoir 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

  4. 4D seismikk / monitorering Reservoarkunnskap og -styring Omfattende innfyllende boring og brønningrep Vann og gassinjeksjon Utblokking av prosessanlegg Development of expected recovery 1986 1996 2000 2007 Statfjord 49,4 % 61,4 % 65,6 % 70 % Gullfaks 46,5 % 49,4 % 54,5 % 70 % “Til siste dråpe”Hvilke virkemidler har gitt oss denne utviklingen? Smarte brønner AMEOR og EOR

  5. Profil 1999 - IOR: +190 mill. Sm3 Profil 1988 - Aksellerasjon Tillegg v.h.a. IOR? 70% ? Basis profil 1982 ProduksjonsprofilerTilleggsreserver ved senfaseutvikling 2006 – 2020+?

  6. 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 Implemented Oil Recovery Measures at Gullfaks NPD IOR award for 2004

  7. Studied, but discarded: Surfactant injection (1992 pilot) Gel blocking (1992 pilot) CO2 miscible injection (2000) Aerobic Microbiological EOR (2006) Oil Recovery Measuresstudied Currently being studied: • Reservoir characterisation, remaining saturation and relative permeability • Temprature effects • Building new reservoir simulation models • WAG evaluations • EOR with water based methods • CO2 studies

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

  9. IOR potensialer i plattformfelt fordelt på tiltakstype(mill Sm3 olje)

  10. IOR – et deltaprosjekt Planlegger i forhold til en usikker basislinje

  11. Oppgave 2 IOR i Cook fm i segment I1 Hvordan oppnå maksimal utvinning av olje i et segment som i dag har en utvinningsgrad på 12 %.

  12. Oppgave 3 Temperatureffekter pga vanninjeksjon Vanninjeksjon har ført til redusert temperatur i reservoaret noe som bl. a. påvirker formasjonsstyrke og elastiske egenskaper.

  13. Reservoir Quality West East • Reservoirs: Brent, Cook, Statfjord & Lunde • Very faulted and eroded, with contrasting layers and weak formations • Dip up to 12 o in the western part. • Porosity (Brent): 30-35 % • Permeability (Brent): 10 D – 10 mD

  14. ”Map” of Gullfaks Main Field

  15. Top NER Top Ness Top Drake Top Tarbert

  16. Visualization of temperature distribution in segment H1 after 20 years of seawater injection. Top left: south – north cross-section through A-35 (well to the left). Bottom left: Layer 48, i.e. R-1. Well A-35 is seen in the bottom

  17. Oil and water properties

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