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How to increase the oil recovery in GFS Statfjord ?. Forslag til Gullfakslandsbyen. Gullfaks Sør Statfjord Formation. PDO 1995: Large volumes in the Statfjord fm. Main reservoir in the Gullfaks Sat. 7 wells 2000 Sm3/d.

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How to increase the oil recovery in GFS Statfjord ?


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gullfaks s r statfjord formation
Gullfaks Sør Statfjord Formation

PDO 1995: Large volumes in the Statfjord fm.

Main reservoir in the Gullfaks Sat.

7 wells 2000 Sm3/d.

1999: F-4 T3H and G-2 T3H in production.

Produced much less than expected.

Statfjord Fm. on hold.

2001: G-3 T2H in production.

Behave in accordance to new expectations.

Unexpected gas breakthrough.

2002/2003: IOR project initiated.

Identified problems:

Limited reservoir communication

Gas limitation

gfs statfjord
GFS Statfjord

Challenge:

  • Complex reservoir with low recovery, goal +18% (LTP 2003-2008)
  • PDO – 12.6 MSm3. Today 5.1 MSm3

Wells drilled

  • Additional perforation of G-2 H and F-4 H in lower Statfjord (summer 2003)
  • G –1 H with DIACS (2003), periodically shut in.
  • G –2 YH MLT with DIACS (2004)
  • F –2 YH MLT with DIACS (2004)
  • G-3 Y3H, 3 branch MLT with DIACS (2005), SHUT in
  • GI MLT with DIACS (2006), only one branch injecting
how can we increase the recovery
Could look into:

Well solutions

Technological solutions

Drilling has so far been challenging. Simple or complex wells ?

Wells spacing ?

Increase of gas injection, number of GI ?

Uncertainties in reserve estimates

When start blowdown ?

Economic considerations

Economic development

No economic limitations, KPI: recovery

How can we increase the recovery ?
reflections could be made around
Reflections could be made around
  • What should be used as a KPI ?
    • Recovery vs. NPV
  • Who makes the decisions?
    • Petroleum law, partners influence
  • Prioritarisation of gas injection or gas export ?
    • (high gas price: more economic to sell gas than inject in marginal oil reservoir)
  • Subsea
    • rig availability a challenge
    • rig costs increasing
  • Simulation model provided, already implemented at NTNU, 2006_students