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J.L. Buchwalter Gemini Solutions, Inc.

Explore how a PC-based reservoir analysis system aids in quick decision-making for E&P well plans in the Black Widow prospect. Learn about the Central GOM EW 966 project, its history, location, and key findings. Discover the impact of reservoir simulation on maximizing value and the benefits of real-time modeling using simulation software. The study includes details on the Basal Nebraskan Sand structure, well data, drilling results, production statistics, and conclusions drawn from the project. Find out how simulation tools can optimize drilling and development decisions, enhance economics, and streamline workflows in the petroleum industry.

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J.L. Buchwalter Gemini Solutions, Inc.

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  1. Black Widow Deepwater Project PC Based Reservoir Analysis System Allows Quick Decision on E&P Well Plans for Black Widow Prospect J.L. Buchwalter Gemini Solutions, Inc. T.M. Campbell Mariner Energy, Inc.

  2. AKNOWLEDGEMENT PGS/Diamond Geophysical Service Corporation

  3. OUTLINE • INTRODUCTION • CASE STUDY • Exploration Well Sidetrack • DRILLING RESULTS • PRODUCTION • CONCLUSIONS

  4. When Can Reservoir Simulation Be Applied to Maximize Value ? • Prevailing Idea in Petroleum Industry • Once you understand the reservoir in detail • GIGO • Calculate accurate reserves and production profiles • Problem: • Often too late to optimize drilling and development decisions • The Hidden Truth • Study before you understand the reservoir in detail • Impact exploration drilling and development • maximize the economics

  5. Central GOM EW 966 Water Depth of 1853 ft Participants Mariner Energy 69% (Operator) Devon Energy 31% Ultimate Reserves 11 MMBOE History Discovered Apr 1998 Sanctioned Jan 2000 Production Oct 2000 Peak Rate Oct 2001 11,000 Bpd 9 MMcfpd Key Facts

  6. FIELD SUMMARY • Small oil discovery in 1998 • Ewing Bank area of the OCS Central Gulf region. • Located approximately 3 miles east of Morpeth. • Developed via a single well subsea tie-back to the Morpeth TLP in EW 921. • First oil occurred in October 2000.

  7. LOCATION MAPS

  8. Index Map

  9. Field Map

  10. OUTLINE • INTRODUCTION • CASE STUDY • Exploration Well Sidetrack • DRILLING RESULTS • PRODUCTION • CONCLUSIONS

  11. High Cost Of Simulation (in the past) • Unix workstations and the Unix-based software • Unix system support personnel required • Need for experts in geological and flow modeling

  12. Offshore Exploration Well • Net Pay Lower Than Expected • Other Uncertain Variables • Sidetrack or Abandon ?

  13. WELL DATA

  14. Time Constraints • Floating Rig - US $125,000 / day • Time 4:00 p.m. • Answer Needed by 12:00 noon the Next Day

  15. Work Flow • Received Data at 6:30 p.m. • Engineer 1 - Reviewed data • Engineer 2 - Built single well model • - Determined sensitivity to rock • and fluid properties • Engineer 3 - Digitized and grided maps • -Calculated volumetrics • - Exported grids to simulator

  16. RESERVOIR DESCRIPTION OF BASAL NEBRASKAN SAND • Early Pleistocene age • Lower Slope environment • Ponded submarine fan complex sands • Oil hydrocarbons • Defined by direct hydrocarbon indicators (amplitude anomaly) using 1996 Diamond Geophysical 3-D seismic volume. • Accumulation trapped by fault, structural closure and minor stratigraphy. • Excellent porosity, perm and low clay content.

  17. Black Widow Amplitude Map

  18. BASAL NEBRASKAN SAND STRUCTURE

  19. Digitized Structure Map

  20. Gridded Top-of-Structure Map

  21. Water Saturation Contour Map at Initial Conditions

  22. Water Saturation Cross-section at Initial Conditions

  23. Model Building A full-field flow model, including wells, faults and an aquifer was developed in four (4) hours.

  24. Flow Rate and Cumulative Production

  25. Water Saturation Contour Map After 4 Years

  26. Water Saturation Cross-section After 4 Years

  27. Study Results • 4 case ran between 6 and 10 PM • 7 additional what ifs ran next morning, varied: • geology • rock properties • All sidetrack drilling cases were economic

  28. OUTLINE • INTRODUCTION • CASE STUDY • Exploration Well Sidetrack • DRILLING RESULTS • PRODUCTION • CONCLUSIONS

  29. WELL DATA

  30. ORIGINAL HOLE AND SIDETRACK

  31. EW 966 #1 ST1 Log Section Basal Nebraskan Sand Penetration

  32. EW 966 #1 ST1 Processed Log Basal Nebraskan Sand

  33. Black Widow N-S Seismic Line N S ST1 OH

  34. DISCOVERY WELL SUMMARYBASAL NEBRASKAN SAND • MEI EW 966 #1 ST1 drilled May ‘98 • Encountered 56 NFP • 32 percent porosity • 13 percent water saturation • LKO - 11,495 ft TVDSS • Assumed OWC – 12,000 ft (HCI)

  35. OUTLINE • INTRODUCTION • CASE STUDY • Exploration Well Sidetrack • DRILLING RESULTS • PRODUCTION • CONCLUSIONS

  36. PRODUCTION STATISTICS • First Production Oct 28, 2000. • Initial BHP 8774 psi – SITP 5591 psi • Peak Rate 10,500 Bpd, 8.8 MMcfpd • Oct 27, 2001 • Through Jun 16, 2002 • Producing 5440 Bopd, 4.6 MMcfpd • Cum 4398 MBo, 3.64 Bcf. • SIBHP 6420 psi - SITP 3067 psi

  37. OUTLINE • INTRODUCTION • CASE STUDY • Exploration Well Sidetrack • DRILLING RESULTS • PRODUCTION • CONCLUSIONS

  38. CONCLUSIONS A PC-based characterization and simulation system exists that allows for modeling of exploration wells while the rig is on-site.

  39. CONCLUSIONS PC-based characterization and simulation in conjunction with the appropriate user interface allows geoscientists and engineers to model reservoirs on a routine real-time basis.

  40. CONCLUSIONS Simulation should be an everyday tool that is used in applications as diverse as exploration well evaluations and full field studies.

  41. CONCLUSIONS The cost of PC-based simulation is low due to the lower costs of hardware, software and support. Manpower costs are significantly lowered due to a powerful interface that reduces both the time to complete a study and the need for expensive simulation experts.

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