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Evolution of Oil Production in the Bakken Formation

Evolution of Oil Production in the Bakken Formation. Julie A. LeFever North Dakota Geological Survey. Plays of the Bakken Formation. Conventional Bakken (pre-1987) Cycle 1 – Antelope Structure (1950s – 60s) Cycle 2 – Depositional Edge (1970s – 80s)

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Evolution of Oil Production in the Bakken Formation

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  1. Evolution of Oil Production in the Bakken Formation Julie A. LeFever North Dakota Geological Survey

  2. Plays of theBakken Formation • Conventional Bakken (pre-1987) • Cycle 1 – Antelope Structure (1950s – 60s) • Cycle 2 – Depositional Edge (1970s – 80s) • Horizontal Drilling of the Bakken Shale (post-1987) • Horizontal Drilling of the Bakken Middle Member (2001 to present)

  3. Conventional Bakken Cycle 1 – Antelope Field • Discovery Well • Stanolind - #1 Woodrow Starr • Initial Potential (536 BO; 0.1 BW) • Antelope Field • 52 wells; 12.5 million BO; 10 BCF Gas • “Sanish Sand” • Completion Method

  4. Conventional BakkenExploration between Cycles • Elkhorn Ranch • Shell Oil Co. - #41X-5-1 Government • Nesson Anticline • #1 B.E. Hove • IP - 756 BOPD, 3 BWPD • Completion Method

  5. Conventional Bakken Cycle 2 – Depositional Limit • Stratigraphy & Structure • Thin Bakken • Multiple Pays • Folds, Faults or Both • Completion Methods

  6. Horizontal Drilling of the Upper Bakken Shale • Meridian - #33-11 MOI • Drilled vertical • Cored, Logged, Drill Stem Tested • Drilled Horizontally - 2603 ft • 8 ft - upper Bakken Shale • IP: 258 BOPD & 299 MCF gas • Cost: $2 million

  7. Learning Curve • Meridian -#33-11 MOI • 57 days to drill • 27 days to drill vertical borehole • 12 days to drill horizontal section • $2 million • 3 set of 10 wells • 35 days to drill at a cost $1.08 million • End of Play • $900,000 (same as a vertical well)

  8. Horizontal Drilling of the Upper Bakken Shale • Drilling Methods • General Problems • Successful well = high volumes of oil

  9. Horizontal Drilling of the Bakken Middle Member • Richland County, Montana • North Dakota

  10. Williston Basin AB SK MB MT ND SD WY Richland Co. McKenzie Co. ND Study Area MT

  11. Richland County, MTStratigraphy South North Mississippian Lodgepole Formation Upper Shale Member Transitional Facies – L7 Upper (Productive) Mississippian Bakken Formation Lithofacies 2 DevonianThree Forks Lower Transitional Facies - L1 Lower Shale Member

  12. Balcron Oil - #44-24 VairaSESE Sec. 24, T.24N., R.54E. GR DensityPorosity Lodgepole Fm. 10000 upper Bakken Fm. middle Three Forks Fm. Neutron Porosity

  13. SESW Sec. 13, T.23N.,R.56E.AHEL #1 H8 NevinsRichland County, MT 10604.5 ft. Bakken/Three ForksContact

  14. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins Richland County, MT Middle MemberLithofacies 2

  15. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins Richland County, MT Middle MemberLithofacies 2(producing facies)

  16. SESW Sec. 13, T.23N.,R.56E. AHEL #1 H8 Nevins Richland County, MT 10582 ft Upper Shale/Middle MbrContact

  17. BLCS Structure Map ft Contour Interval Montana North Dakota

  18. Formation Limits Bakken Formation Upper Middle Lower Prairie Salt Edge Montana North Dakota

  19. Isopach of the Bakken Formation ft 140 130 120 110 100 90 Contour Interval 80 70 60 50 40 30 20 10 0 Montana North Dakota

  20. Isopach of the Upper MemberBakken Formation ft Contour Interval Montana North Dakota

  21. Isopach of the Middle MemberBakken Formation ft Contour Interval Montana North Dakota

  22. Middle MemberPorosity Zone % Contour Interval McKenzie Co. Richland Co. Contour Interval: 2 ft.

  23. Bakken Middle MemberPrairie Salt Prairie Salt Edge ft Contour Interval Montana North Dakota

  24. Bakken Middle MemberPrairie Salt Prairie Salt ft Contour Interval Montana NorthDakota

  25. Richland County 80 Producing Fields1. Red River Fm2. Madison Fm 3. Bakken Fm4. Duperow Fm5. Interlake Fm 20 Fields produce(d) from the Bakken Formation 08/2004

  26. Bakken FormationRichland County, MT • Historically – • 42 Bakken wells + 8 commingled wells • Currently – • 127 Bakken Producers • Horizontals – 92 producers, 1 PNA, 1 Dry • Total production • 2000 – 2,618,982 BO • 2003 – 5,284,378 BO • 2004 – 3,275,061 BO (thru August, 2004) • 86 Producing Fields, 23 - Bakken Production 08/2004

  27. Drilling & CompletionBakken Horizontals • Two laterals to a 1280 spacing unit • Well is stimulated with large fracture treatment (~920,000#, gelled water/sand frac) • Cost $2.2 million • 500-700 BOPD initially • Virtually no water

  28. Horizontal Drilling of the Bakken Middle Member • Richland County, Montana • North Dakota

  29. Lithofacies of the Middle Member Upper Shale Lithofacies 5 - Siltstone Lithofacies 4 – Interbedded Dark Grey Shale and Buff Silty Sandstone Lithofacies 3 - Sandstone Productive Lithofacies 2 – Interbedded Dark Grey Shale and Buff Silty Sandstone Productive in MT Lithofacies 1 - Siltstone Lower Shale (From LeFever and others, 1991)

  30. Lithofacies 3

  31. SENW Sec. 11, T160N, R95W Conoco, Inc. - #17 Watterud “A” GR Res Producing Zone Upper L2 Facies

  32. Joilette Oil (USA), LLC.#1-17R Robert Heuer • Sadler Field • Re-entry of a Madison Test (02/13/1981) • Bakken Completion • 03/05/2004 • IP – 87 BOPD, 150 MCF, 142 BWPD • Fracture Stimulated • Producing Zone – Lithofacies 3

  33. What Do We Know? • Rocks Types (Montana=North Dakota) • Additional Productive Section • Lithofacies 3, “Sanish”, lower Lodgepole Limestone • Salt Collapse • Completion Methods • High Production Rates

  34. Conclusions • Horizontal Drilling Middle Member = Success

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