WITSML Technical Team Update Houston May 2006

Technical Team Responsible for technical content of WITSML standard XML Schemas XML Schemas Application Programming Interface (API) Application Programming Interface (API) Interpretation of API usage issues Interpretation of API usage issues Interface with Use Case & Implementation teams Interface with Use Case & Implementation teams

Technical Team Process Yahoo Group for posting issues WITSML.org site for internal documentation maintained by POSC Monthly conference calls 2 days of meetings twice a year

WITSML Issue List

Issues Discussed MudLog object issues Create a volume per volume measure that only has % for lithPC Create a volume per volume measure that only has % for lithPC Sum of lithPCs should be 100% - add undifferentiated item Sum of lithPCs should be 100% - add undifferentiated item Abundance code – need to define a list Abundance code – need to define a list Md top and bottom for qualifiers should be within geology interval Md top and bottom for qualifiers should be within geology interval Interp. Lithology qualifiers has both qualifiers (silty) and modifiers (fossil) needs more offline discussion. Interp. Lithology qualifiers has both qualifiers (silty) and modifiers (fossil) needs more offline discussion. Units of measurement Units of measure magnetic flux density for survey corrections Units of measure magnetic flux density for survey corrections Remove gigaradians to avoid confusion with Grad Remove gigaradians to avoid confusion with Grad Review query behavior for growing objects Documentation to be updated Documentation to be updated Errors in schema files Problem with validating individual xsd file due to missing include file. Needs to be fixed in the schema Problem with validating individual xsd file due to missing include file. Needs to be fixed in the schema

Issues Discussed Well log depth registration schemas Add one new element to log and well log to define scaling adjustment Add one new element to log and well log to define scaling adjustment Also add geopolitical location Also add geopolitical location Performance of v1.2 to v1.3 transform 1.2 to 1.3 transform performance. SDC using it but it’s slow. 1.2 to 1.3 transform performance. SDC using it but it’s slow. Unique mnemonics Are mnemonics unique in realtime and log objects? Are mnemonics unique in realtime and log objects? Important issue for identifying log curves and realtime channels Important issue for identifying log curves and realtime channels

Issues Discussed Coordinate Reference System WellCRS – proposal to create a separate CRS object independent of well. Recommend use GML existing standard or a cut-down version WellCRS – proposal to create a separate CRS object independent of well. Recommend use GML existing standard or a cut-down version Run numbers How to find active run number (e.g for logs or BHAs in a wellbore)? How to find active run number (e.g for logs or BHAs in a wellbore)? Different run numbers for bit, BHA, LWD, wireline Different run numbers for bit, BHA, LWD, wireline How to find logs in a hole section? Query wbGeometry then depth range in a wellbore Query wbGeometry then depth range in a wellbore May not catch just the logs in the latest hole size section May not catch just the logs in the latest hole size section

Issues Discussed Active wells & wellbores and current objects statusWellbore should be populated and updated or not present or used while drilling if it is not going to be kept up to date. statusWellbore should be populated and updated or not present or used while drilling if it is not going to be kept up to date. How to find most recent instance of anything? How to find most recent instance of anything? How do we know when an activity stops? How do we know when an activity stops? Could use a realtime object to carry current information for various objects Could use a realtime object to carry current information for various objects Delete method for realtime. WITSML API only allows delete of whole objects so can not delete a channel from realtime WITSML API only allows delete of whole objects so can not delete a channel from realtime Discussed special behavior to avoid putting uids in realtime and channel Discussed special behavior to avoid putting uids in realtime and channel

Issues Discussed Embedded objects in WITSML XML attachments to SOAP? XML attachments to SOAP? Needs further review by Use Case team Needs further review by Use Case team How to identify when objects are created and updated Works fine for non-growing objects Works fine for non-growing objects Need to define when existing objects are modified. Need to define when existing objects are modified. Randomly growing objects are a problem – mudLog may have sub-objects out of sequence Randomly growing objects are a problem – mudLog may have sub-objects out of sequence Trajectory – can query the dTim on stations to detect new additions or edits Trajectory – can query the dTim on stations to detect new additions or edits Stations transmitted via WITS may not have time stamp. Server needs to populate time stamp Stations transmitted via WITS may not have time stamp. Server needs to populate time stamp Use standard naming technique for start end depths and times in all objects Use standard naming technique for start end depths and times in all objects

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