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Practical Well Log Standards

Practical Well Log Standards. Paul Maton, POSC Jim Theriot , POSC. Outline. Business Drivers, Challenges Phase 1 outcomes Phase 2 approaches, results, examples Next Steps. Well Logs: Business Issues. Huge numbers of curves (information overload)

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Practical Well Log Standards

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  1. Practical Well Log Standards Paul Maton, POSCJim Theriot, POSC

  2. Outline • Business Drivers, Challenges • Phase 1 outcomes • Phase 2 approaches, results, examples • Next Steps

  3. 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

  4. 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

  5. Log Data Management: Challenges • Nomenclature • Logging companies’ Vocabularies • Oil companies’ Dictionaries • Classification • Tool types • Curve types • Value • Who uses ... • Which logs... • How often ... • For what ...

  6. PWLS Version 1 • Classified ~2500 curves for ~100 tools from 3 logging companies • Defined business value – high, medium, low • Classifications published at www.posc.org/technical/PWLS/pwls_10.htm

  7. PWLS Version 2 Objectives • Clarify Curve Class and Classification • Emphasize two primary use cases: • Classify curve instances based on logging company mnemonics • Use curve classifications to search for relevant curve instances

  8. Users and Usage Patterns - General • Geologist, Geophysicist, Engineer • Get log(s) by Field, Block, Well, Log type • Store interpreted work • Petrophysicist • Get Curve set for editing, processing, analysis • Log Data Manager • QC and load old, and/or new logs • Classify logs and compile log catalogue

  9. Users and Usage Patterns – PWLS V2 • Geoscientist, Engineer, Log Data Manager • Understand and classify log curves in industry terms starting from mnemonics on log header • Logging Company Dictionary Administrator • Submit company catalogue (initial or replacement) to POSC • Submit incremental change or addition to POSC • POSC • Maintain company and industry (classification) data • Accept new and revised data from logging companies

  10. Approach • Understand nomenclatures • Identify, share and adopt good practices • “Never change original document or its data” • Produce and maintain the standards • Logical, generic, high-level classification • Map logging and oil companies’ dictionaries to the generic classification • Make it easily understood and available • Keep it up-to-date: this needs Oil Co. support

  11. Company, Industry Data ‘Company’ nomenclature ‘Industry’ nomenclature Company-defined codes, mnemonics Industry-agreed classes ? common name common definition (definition exists) stable (managed) company-specific dynamic cryptic (?)

  12. Company Channel Class Property Class Well Log Curve Class RP66 Org codeCo. MnemonicDescription Business valueClassificationQuantity & UoM Name ObjectPropertyTechniqueModifier(s)Function NameParent Class Description Channel, Curve and Property ‘Industry’ nomenclature ‘Company’nomenclature Maps to Maps to

  13. Curve Type Queries • What is the object (or thing) whose properties we are measuring? • Formation, casing, cement, wellbore, acquisition, etc. • What (pure) property of the object are we measuring? • Density, porosity, velocity, etc. • What technique are we using to make the measurement (with the tool)? • Neutron, acoustic, etc. • Modifiers (or qualifiers) qualifying the (pure) Property • Deep / shallow; maximum / average / minimum, etc. • Function • Mathematical derivation / calculation, e.g. ratio, std. deviation

  14. Some Company Curve Classes

  15. More Company Curve Classes

  16. Channel, Curve Example 1 ‘Industry’ nomenclature ‘Company’nomenclature Company Channel Class Well Log Curve Class Maps to Name: Gamma_Ray Object: Formation Property: Gamma Ray Technique: (Spectrometry)Modifier(s): -Function: - RP66 Org code: 150Co. Mnemonic: GRDescription: Gamma RayClassification: Gamma_Ray Units Class: API_Gamma_Ray

  17. Channel, Curve Example 2 ‘Company’ nomenclature ‘Industry’ nomenclature Company Channel Class Well Log Curve Class Maps to Name: Electromagnetic_Caliper Object: Borehole Property: Caliper Technique: Electromagnetic Modifier(s): - Function: - RP66 Org code: 440Co. Mnemonic: PCALDescription: Caliper from Phase Shift Imbalance Business Value: HighClassification: Electromagnetic _Caliper Units Class: Cylinder_Diameter

  18. Links • Property Type Browser • Company Data Views • Industry Data Views • Schema for PWLS Reference Data

  19. Current Focus: Usage • Users • Oil companies • Log analysts, Consultants • Data management repositories, companies • Suppliers • Logging contractors (Acquisition, Processing …) • Software developers and vendors • Evolve • User communities use PWLS and provide feedback • Revise specifications and implementations • Maintain Property, Curve and Tool catalogues

  20. Conclusions • Version 2 published at http://www.posc.org/technical/PWLS/pwls_20.htm • Active usage encouraged • Future direction and evolution through PWLS SIG • Version 2.1 planned for release by year-end 2004 • PWLS SIG meetings: • Stavanger 15-16 June • Houston 23-24 June • Additional info from www.posc.org or contact theriot@posc.org or maton@posc.org

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