= SAWSDL Prototype for Semantic Days 2008 =
The SAWSDL prototype is developed in cooperation with Odd Frode Torbjørnsen - !UiS/Cap Gemini, Kari Anne Thorsen - UiS and Henning Jansen, NOV. The purpose of the prototype is to demonstrate the potential usefulness of SAWSDL as infrastructure of common Oil & Gas upstream data integration. The prototype is demonstrating a small subset of Daily Drilling Report - DDR, (a WITSML compliant XSD standard) and a simplified proprietary dataset in OPC-UA. The purpose of the prototype is to be able to receive a [http://www.glossary.oilfield.slb.com/Display.cfm?Term=survey Survey Station] in OPC-UA format and express it as DDR.

=== Survey Station ===
A [http://www.glossary.oilfield.slb.com/Display.cfm?Term=survey Survey Station] is a point in the drilling process where a measurement of the inclination and azimuth of the borehole is performed. The Survey Station (the measured point) is used to calculate the trajectory of the well.

==== Daily Drilling Report - Survey Station ====
The Daily Drilling Reporting schema has a Survey Station complex element (on line 1333). The survey station consists of the following five fields:

 - [http://projects.dnv.com/reference_data/RD4Browser/default.aspx?RDLDesignation=DATE%20OF%20SURVEY%20OPERATION dTim - Date/Time for Survey Operation]
 - [http://projects.dnv.com/reference_data/RD4Browser/default.aspx?RDLDesignation=MEASURED%20DEPTH%20TO%20DIRECTIONAL%20SURVEY%20POINT%20RELATIVE%20TO%20RKB%20-%20METRE md - Measured Depth ]
 - [http://projects.dnv.com/reference_data/RD4Browser/default.aspx?RDLDesignation=TRUE%20VERTICAL%20DEPTH%20FROM%20RKB%20TO%20SURVEY%20POINT%20-%20METRE tvd - True Vertical Depth]
 - [http://projects.dnv.com/reference_data/RD4Browser/default.aspx?RDLDesignation=MEASURED%20INCLINATION%20OF%20WELLBORE%20AT%20SURVEY%20POINT%20-%20DEGREES incl - Hole inclination]
 - [http://projects.dnv.com/reference_data/RD4Browser/default.aspx?RDLDesignation=MEASURED%20AZIMUTH%20OF%20WELLBORE%20AT%20SURVEY%20POINT%20RELATIVE%20TO%20TRUE%20NORTH%20-%20DEGREES azi - Hole azimuth]


==== OPC-UA datastructure ====
Consists of 4 fields, the datetime is omitted.

 - MDEPTH - Measured Depth
 - TVDEPTH - True Vertical Depth
 - INCL_V_DEG - inclination in degrees measured from vertical plane
 - AZMH_TN_DEG - azimuth in degrees measured from true north