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PWLS Update

Aberdeen, Scotland June 21, 2006. PWLS Update. PWLS. A set of industry-standard dictionaries curve classes, tool classes, property types, ... A set of dictionaries of company-defined mnemonics services, tools, channels, ... classified by reference to industry standard dictionary entries.

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PWLS Update

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  1. Aberdeen, Scotland June 21, 2006 PWLS Update

  2. PWLS • A set of industry-standard dictionaries • curve classes, tool classes, property types, ... • A set of dictionaries of company-defined mnemonics • services, tools, channels, ... • classified by reference to industry standard dictionary entries

  3. PWLS Website • http://w3.posc.org/pwls • your log + PWLS => standard descriptions for your log's service, tools, and channels • your log database + PWLS => search for logs using non-proprietary keys

  4. PWLS Process • Industry standard dictionaries maintained by POSC community, administered by POSC • Company-defined dictionary content managed by respective companies, facilitated by POSC • Classification of company-defined mnemonics submitted by respective companies, validated by industry

  5. Current Work in Progress • Update PWLS curve classes, property types from WITSML 'realtime' (MWD) class dictionary • Incorporate PWLS curve classes into WITSML wellLog channel classifications • Recent proposal for managed dictionary of curve and parameter definitions, e. g. for use as LAS dictionaries

  6. PWLS Change Requests Joined and Interpreted MnemonicsSource: Shell

  7. Well Logs: Business Issues Huge numbers of curves (information overload) • Most oil company customers only load a small sub-set of curves into their data stores Complex naming at BOTH Curve and Tool level • Confusing even to petrophysicists • Others got lost years ago! Hard to find up to date information in public domain • Isolated lists, complex language Expert (petrophysicist) and generalist users have different requirements

  8. Information Overload - Business Value Note: Business Value does not take account of usage. It deals with the ‘average’ case Load Frequency High Business Value Most oil company customers only load a small sub-set of curves into their data stores Most Commonly Loaded Medium Business Value Loaded for specialist applications Rarely Loaded Loaded Curve Names

  9. Tool Class: Curve Class: Company: Service Class: Channel/Curve (Mnemonic): Tool Series: Service-Channel Xref:

  10. simple Query Generic Name: specific Object: Technique: Pure Property: Modifier(s): Function Curve Class: Tool Class: Company: Service Class: Channel/Curve (Mnemonic): Tool Series: Service-Channel Xref:

  11. Examples of Company Curve Classifications

  12. For Oil Company Generated Curves Recommended Curve Mnemonics

  13. Tool Class: Curve Class: Company: POSC (1000) Service Class: Joined, Interpreted Channel/Curve (Mnemonic): Tool Series:Joined, Interpreted Service-Channel Xref:

  14. PWLS Joined (1 of 3)

  15. 2004 Shell Change Requests • In summer 2004, Shell presented an alternate set of joined and interpreted curve mnemonics at PWLS meetings • Shell and POSC staff analyzed the similarities and differences, resulting in a set of Change Requests • 6 Change Requests • Were posted for comment • Were resolved based on comments received • Accepted changes constitute Version 2.1 update

  16. Creating Virtual Team (Domain Experts & Data Managers) Collating Existing Documents Endorsed by Discipline Leadership Team Presenting To POSC SIG Discussing PWLS Change Request with POSC 8/2003 9/2003 3/2004 6/2004 12/2004 Curve Naming Standards in Shell • Joined Curves • Calculated / Interpreted Curves Internal: Implementing External....

  17. Shell Curve Naming Standards vs. PWLS V2.0Joined & Calculated Curves SIMILARITIES: • Most maps comfortably DIFFERENCES: • Terminology: • DT vs. AC • Granularity: • PWLS V2 Porosity does not have classes Net or Net Effective • HC Saturation does not have any subclass • Water Saturation does not have any subclass except Flushed Zone • Resistivity Depths of Investigation does not differentiate Shallow and Micro • Scope: • PWLS does not cover RFT pressures, TVD, FLD, LITH, Cased Hole, etc. • Shell does not cover Minerals, Drilling Bit Size, etc. • Flexibility: • Shell allows local specific for Volume Fractions • Shell allows interpretation method as the suffix for all Calculated Curves

  18. Change Requests and Results • Acoustic: • Add Stoneley Slowness curve – Accepted • Replace AC with DT– Not Accepted • Resistivity: • Differentiate Shallow and Micro– Accepted • Permeability: • Replace LPERM with PERM– Accepted • Porosity: • Remove Total Porosity. Use generic Porosity instead– Not Accepted • Add Effective, Net Effective– Accepted • HC Saturation: • Add Net, Effective, Effective Net, and Flushed Zone– Accepted • Water Saturation: • Add Net, Effective, and Effective Net-Accepted

  19. PWLS V2.0 – Use in Shell • Petris is working on implementing PWLS v2.0 standard for Raw Curves in Recall by Shell’s request; • Plan to implement PWLS v2.0 for Raw Curves Names in Recall Standard Data Dictionaries • Shell Global Standard onJoined and CalculatedCurvesimplemented in Global Recall Data Dictionaries; Deviations to PWLS V2.0 need to be revisited • Shell is working on: • How and to what extend to use PWLS V2.0(Raw Curves) • Property Types • Attributes • Mapping between: • TechLog Curve Family • Recall Curve Types • PWLS Property Types • Targeting to find alignment by end of 2005

  20. PWLS Joined (1 of 3): Change Results REMOVED

  21. PWLS Joined (2 of 3)

  22. PWLS Joined (3 of 3): Change Results

  23. PWLS Interpreted (1 of 2): Changes NOT REMOVED

  24. PWLS Interpreted (2 of 2)

  25. PWLS Change Requests(new) 1. Generic Curve Classes2. New Curve ClassesSource: CDA

  26. Information Overload - Business Value Note: Business Value does not take account of usage. It deals with the ‘average’ case Load Frequency High Business Value Most oil company customers only load a small sub-set of curves into their data stores Most Commonly Loaded Medium Business Value Loaded for specialist applications Rarely Loaded Loaded Curve Names

  27. Tool Class: Curve Class: Company: Service Class: Channel/Curve (Mnemonic): Tool Series: Service-Channel Xref:

  28. simple Query Generic Name: specific Object: Technique: Pure Property: Modifier(s): Function Curve Class: Tool Class: Company: Service Class: Channel/Curve (Mnemonic): Tool Series: Service-Channel Xref:

  29. Examples of Company Curve Classifications

  30. Draft Change Requests…

  31. Draft Change Requests…

  32. Next Steps • Review and refine change requests with CDA. • Produce change request document. • Post change requests with 6 to 8 week comment period; conduct conference call within Geology / PWLS community. • Evaluate feedback • Accept uncontested change requests and cycle contested ones for reconsideration. • Publish updated Standards and promote usage.

  33. Alan DonigerPOSC Chief Technology Officer24 Greenway PlazaSuite 1000-BHouston, TX 77046-2401+1 713 267-5124 phone+1 713 784-9219 faxDoniger@POSC.orghttp://www.posc.org

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