1. CDA Limited 21 st June 2006 POSC Special Interest Group European Regional Meetings Aberdeen, 21 st June 2006 CS-3 Curve Catalogue Standard Richard Salway CDA Limited

2. 21 st June 2006 Slide 2 POSC SIG European Meetings CS-3 Curve Catalogue Standard Background  The CDA Well DataStore is a National Data Repository of UKCS well data containing Digital Well Logs for 30 E&P Member Companies  Data is stored as complete Tape Image Files and also as individual curves.  Over 7 million curves

3. 21 st June 2006 Slide 3 POSC SIG European Meetings CS-3 Curve Catalogue Standard Background  Catloging these curves was previously achieved by loading scripts applied to Recall.  A Curve Filter was developed based on 4500 known curve mnemonics. Determined Online or Archive storage Out of date (circa 2000) Unknown mnemonics were ‘skipped’

4. 21 st June 2006 Slide 4 POSC SIG European Meetings CS-3 Curve Catalogue Standard Requirements  CDA recognised that improvements could be made to the filter.  Requirement to categorise curves into simple generic types.  Requirement to have consistent attribution determined by the filter but still allow certain attributes to be variable (such as values).

5. 21 st June 2006 Slide 5 POSC SIG European Meetings CS-3 Curve Catalogue Standard Process 1.Source the curve lists 1.PWLS 2.Schlumberger (Houston) 3.CDA DataStore 2.Combine lists into one and derive common attributes Mnemonic Logging Contractor Description Property (Classification) Unit Quantity (Unit Class)

6. 21 st June 2006 Slide 6 POSC SIG European Meetings CS-3 Curve Catalogue Standard Process 3.Determine CS-3 Code (Generic type)

7. 21 st June 2006 Slide 7 POSC SIG European Meetings CS-3 Curve Catalogue Standard Process 4.Determine Business Value (High, Low or Quarantine) 1.HBV sends curve ‘Online’ 2.LBV sends curve to ‘Archive’ 3.Quarantine sends curve to ‘Archive’ but flags for future mitigation

8. 21 st June 2006 Slide 8 POSC SIG European Meetings CS-3 Curve Catalogue Standard Application  Schlumberger awarded Well DataStore Contract in Jan 2006  Tape Image Files migrated from Landmark PetroBank (Recall)  Tape Image Files passed through CS-3 curve filter on loading  Logging Contractors identified from TIF  New Logging Contractor codes allocated to Quarantined mnemonics in catalogue  Back population of Logging Contractor to CS-3 filter  System went live on June 20th

9. 21 st June 2006 Slide 9 POSC SIG European Meetings CS-3 Curve Catalogue Standard On going maintenance  Back populate missing attributes for Quarantined curves from loaded data  Re-classify Quarantined curves when attribution is complete  Treat new Quarantined curves periodically  Capture new mnemonics where possible

10. 21 st June 2006 Slide 10 POSC SIG European Meetings CS-3 Curve Catalogue Standard Access to CS-3  The new version of CS-3 has now been published on the CDA website www.cdal.com