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How to increase the oil recovery in GFS Statfjord ?

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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  1. How to increase the oil recovery in GFS Statfjord ? Forslag til Gullfakslandsbyen

  2. 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

  3. DIACS and MLT F-4 and G-2 drilled G-3 drilled Development of GFS Statfjord reserves

  4. 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

  5. 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 ?

  6. 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

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