Post on 31-Mar-2015
Classification: Internal Status: Draft
Eksperter i Team – Gullfakslandsbyen 2008
Gullfaks historie – et norsk svennestykke Leif-Kristian Teviterå, Corporate trainee, StatoilHydro Gullfaks satelitter Petec
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Structural Depthmap – Base Structural Depthmap – Base CretaceousCretaceous
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
Gullfaks reservoir data
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Gullfaks main field, WE cross-section
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The Gullfaks-field
Classification: Internal Status: Draft
For at en skal få danne et olje/gas felt er det flere forhold som må oppfylles :
Reservoir
Trap
Reservoar
Felle
Seal Segl
Modning og migrasjon av hydrokarboner
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•
Infill of oil (migration)
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Gullfaks Production Profile (incl. IOR) and the Timing of the 3D Seismic Surveys
1986 1990 1994 1998 2002 2006 2010 20140
50
100
150
200
Ra
te S
m3
/sd
x 1
00
0
1985
SU
RV
EY
1995
SU
RV
EY
1996
SU
RV
EY
OIL
WATER
IOR OIL
WATER INJECTED
1999
SU
RV
EY
2003
SU
RV
EY
2001
OB
C
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Implemented Oil Recovery Measures at Gullfaks
• 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
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Oil Recovery Measures studied
Studied, but discarded:
• Surfactant injection (1992 pilot)
• Gel blocking (1992 pilot)
• CO2 miscible injection (2000)
• Aerobic Microbiological EOR
(2006)
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
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Well targets
Gullfaks in the past and present;
Steak vs. ragu
Gullfaks
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Korleis drive eit felt som er på haleproduksjon?
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Finne nye boremål og planlegge nye brønnar utgjør størsteparten av
arbeidsoppgavene til petroleumsteknisk (Petek) personell på Gullfaks
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Saturation log34/10 C-3
Etive-formation
1990 04.1993 02.1994 12.1996
By repeated well-tests we can monitor how the flooding affect our reservoirs