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Drilling Opportunities ADVANCED 3D ANLYSIS FOR NEW WELLS. www.sofoil.com. AGENDA. OBJECTIVES. SCOPE OF WORK. DELIVERABLES. TECHNICAL OVERVIEW. GENERAL INFORMATION. Two oilfields within licence boundary Brought into production in 1944 Terrigenous reservoir rocks Middle Miocene

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  1. Drilling Opportunities ADVANCED 3D ANLYSIS FOR NEW WELLS www.sofoil.com

  2. AGENDA

  3. OBJECTIVES

  4. SCOPE OF WORK

  5. DELIVERABLES

  6. TECHNICAL OVERVIEW

  7. GENERAL INFORMATION • Two oilfields within licence boundary • Brought into production in 1944 • Terrigenous reservoir rocks Middle Miocene • 3 main oil saturated formations (sands) • Total drilling - 20 wells (14 wells were productive) FIELD II FIELD I

  8. STRUCTURE MODEL WELL CORRELATION 3D GEOLOGICAL STRUCTURE Oil Oil F1 Oil F2 F1 F2 F3 F3 SEISMIC DATA • Formations and layers are in general continuous • Conformability of stratigraphic layers

  9. 3D MODELLING 3D GEOLOGICAL STRUCTURE 3D MODEL Clay volume calculation PETROPHYSICAL STUDY 3D model was built according to vertical inhomogeneityestimation results

  10. HISTORY MATCHING 1945-1957 1957-1991 Water Rate, stb/day Water Rate, stb/day Oil Rate, stb/day Oil Rate, stb/day • Good oil production matching • There aren’t full reliable data on water production

  11. FOIL MAP F1 2013 1944 FOil • Initial and current FOIL maps were built for each formation. • FOIL maps shows the initialand current oil reserves concentration in every point of map (ft3) Outer Initial OWC Outer Initial GOC Lease boundaries (Area 2, Area 1)

  12. FOIL MAP F2 2013 1944 FOil • Initial and current FOIL maps were built for each formation. • FOIL maps shows the initialand current oil reserves concentration in every point of map (ft3) Outer Initial OWC Outer Initial GOC Inner Initial GOC Lease boundaries (Area 2, Area 1)

  13. FOIL MAP F3 1944 2013 FOil • Initial and current FOIL maps were built for each formation. • FOIL maps shows the initialand current oil reserves concentration in every point of map (ft3) Outer Initial OWC Lease boundaries (Area2, Area 1)

  14. CURRENT OWC & GOC w11 w13 w19 w16 w31 JF17 F1 +8 ft F2 +14 ft F3 +17 ft Saturation of Oil Original GOC 0.2 0.4 0.6 0.8 0.0 Current GOC Original OWC Current OWC

  15. RECOMMENDATIONS

  16. DRILLING PLAN ON CURRENT FOIL MAP • Current FOIP map is most convenient tool for planning of actions F3 F2 F1 NW4 NW4 NW4 NW2 NW2 NW2 NW1 NW1 NW1 NW3 NW3 NW3 Current OWC Outer Initial OWC Inner Initial OWC Outer Initial GOC Inner Initial GOC Lease boundary (Area 2, Area 1)

  17. NEW WELLS JUSTIFICATION NW4 NW3 NW1 NW2 • Local maximum of mobile oil • High altitude • Away from possible aquifer front • Away from possible injection front F1 F2 F3

  18. RESULTS

  19. PRODUCTION FORECAST NW3 – FEBRUARY 2015 NW4 – AUGUST 2014 1800 NW2 – FEBRUARY 2014 NW1 – AUGUST 2013 1500 Watercut, % 1200 Production oil, bpd Cum. Oil, mln stb 900 600 300 0

  20. WELL PW1 DRILLING RESULTS Comparison of sections PW1. Producing formation cross point Dept ft Dept ft Rocks of well PW1 Rocks expected F1 F2 PW1 13 ft Kper=945 mD Kpor=28% F2 Kper=800 mD Kpor=28% F3 F3 F2 Well completion results Water Oil In fact well was drilled bit to south-west from the project borehole • Slight formation cross point deviation from planned well (NW4) • Lower position of formation F2 • A bit smaller permeability affected lower production rate

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