1. DDR Drilling and Well model Status – core group meeting

2. © Det Norske Veritas AS. All rights reserved. 14 January 2011 2 Re-use of existing drilling and well model WELL COMPLETION WELL COMPLETION STRING HANDLING COA COFO Activities related to making up/testing/running/ landing/pulling of the completion string /tailpipe and/or production tubing, including setting and testing of production packer(s) run in conjunction with the string. An assembly of downhole tubulars and equipment required to enable safe and efficient production from an oil or gas well. WELL CASING http://www.osh.dol.govt.nz/publications/booklets/geothermalwells2005/pg2.shtml COFO COIPO WELL COMPLETION STRING CLASS WELL TUBING WELL CASING ASSEMBLY WELL COMPLETION ASSEMBLY WELL TUBING ASSEMBLY COFO WELL LINER WELL LINER ASSEMBLY COIPO COFO WELL CONDUCTOR CASING WELL SURFACE CASING WELL INTERMEDIATE CASING WELL PRODUCTION CASING WELL CONDUCTOR CASING ASSEMBLY WELL SURFACE CASING ASSEMBLY WELL ASSEMBLY WELL PRODUCTION CASING ASSEMBLY WELL INTERMEDIATE CASING ASSEMBLY

3. © Det Norske Veritas AS. All rights reserved. 14 January 2011 3 Extending the drilling and well model with activities, runs and periods WELLBORE DRILLING ACTIVITY #N-1 DRILLING ACTIVITY #N DRILLING ACTIVITY #N+2 BIT RUN IN REPORTING PERIOD HOURS DRILLED IN REPORTING PERIOD DEPTH AT START DRILLING ACTIVITY #N DRILLING ACTIVITY #N-2 BIT NNN RUN #j+1 BIT MMM RUN #i+1 BIT MMM RUN #i BIT NNN RUN #j BIT MMM RUN #i-1 DRILLING ACTIVITY #N-3 DRILLING ACTIVITY #N+3 DRILLING ACTIVITY #N-4 REPORTING PERIOD #m HOURS DRILLED DURING RUN HOLE MADE DURING DRILLING ACTIVITY #N DEPTH AT END DRILLING ACTIVITY #N BIT NNN RUN #j+2 DEPTH AT END DRILLING REPORT PERIOD #m DEPTH AT START DRILLING REPORT PERIOD #m HOLE MADE DURING DRILLING REPORT PERIOD REPORTING PERIOD #n REPORTING PERIOD #p A REPORTING PERIOD in this context is by definition fixed to be 24 hours. Starting times may however differ, e.g. 00:00, or 06:00. REPORTING PERIOD #o REPORTING PERIOD #n

4. © Det Norske Veritas AS. All rights reserved. 14 January 2011 4 Main classes and individuals WELLBORE DRILLING ROCK DRILL BIT THE ACTUAL WELLBORE WELL CASING STRING THE ACTUAL WELL CASING STRING LINING THE ACTUAL LINING WELL TUBING THE ACTUAL WELL TUBING DRILLING RIG THE ACTUAL RIG #NN CEMENT GROUT THE ACTUAL CEMENT GROUT WELLBORE CEMENTING WELLBORE (New entity type) THE ACTUAL REPORT REPORT THE ACTUAL WELLBORE CEMENTING THE ACTUAL ROCK DRILL BIT THE ACTUAL WELLBORE DRILL BIT RUN CEMENTING DRILLING CEMENTING EQUIPMENT CLASS ARTEFACT CLASS BOREHOLE (New entity type) HOLE DRILL BIT CASING ACTIVITY WELL CASING ACTIVITY THE ACTUAL WELL CASING ACTIVITY WELL CASING WELL CASING ASSEMBLY THE ACTUAL WELL CASING THE ACTUAL WELL CASING ASSEMBLY WELLBORE CEMENT GROUT REPORTING PERIOD WELLBORE DRILL BIT RUN

5. © Det Norske Veritas AS. All rights reserved. 14 January 2011 5 Design Basis – not all concepts belonging to a section belongs logically to the physical item the section groups information about  Bit Data Section - The following entries are concerned with the “drill bit” - Size (in) - Model - Dull grade - The following entries are concerned with the “activity” - Hours drilled (hrs) - Hours drilled (Run) (hrs) - Bit/Run number - The following entries are concerned with the “hole” - ROP (m/hr) - Total ROP (m/hr) - Total Hole Made (Run) (m) - Total Hours drilled (Run) (hrs) - Hole Made (Run) (m) - MD ln (mKB) - MD Out (mKB)

6. © Det Norske Veritas AS. All rights reserved. 14 January 2011 6 DDR “Drill bit” = ROCK DRILL BIT ROCK DRILL BIT DRILL BIT CORE DRILL BIT DIAMOND DRILL BIT FIXED CUTTER DRILL BIT ROCK DRILL BIT 14 3/4 NS ROCK DRILL BIT 36 NS ROLLER CONE DRILL BIT SCREWTYPE DRILL BIT DULL ROCK DRILL BIT THE WELLBORE DRILL BIT ACME INC. WIDGET ALPHA NS 14 3/4 NS ROCK DRILL BIT 14 3/4 NS 13 3/4 COID ACME INC. WIDGET ALPHA COID

7. © Det Norske Veritas AS. All rights reserved. 14 January 2011 7 “OBJECT IN FOCUS” Modelling and mapping example - DDR Rock Drill Bit Size (in) Size (in) COCOId DAILY DRILLING REPORT ROCK DRILL BIT SIZE CODE ASSIGNMENT CLASS represented pattern COId ROCK DRILL BIT 14 3/4 NS 14 3/4 DAILY DRILLING REPORT ROCK DRILL BIT SIZE CODE STRING CLASS DAILY DRILLING REPORT ROCK DRILL BIT CLASS ROCK DRILL BIT ????? BIT ARTEFACT DRILL BIT DDR ROCK DRILL BIT SIZE TEMPLATE SIGNATURE A ‘template input list’ that is the input required to state the nominal size of an actual ‘wellbore drill bit’. Role 1: The identifier for the actual ‘wellbore drill bit’, Role 2: The size code of the actual ‘wellbore drill bit’. The SW shall create the anonymous object and make it a subclass of the COIPO corresponding to the size code, and make the actual ‘wellbore drill bit’ a member of the anonymous class. The wellbore drill bit

8. © Det Norske Veritas AS. All rights reserved. 14 January 2011 8 Status  Overall: The reference data modelling effort is well on its way  Issues - The model puts on some restrictions - Relationships and classes of relationships have to have their ends defined - Most “properties” and “attributes” are relationships - We therefore need to put a taxonomy of “objects” in place before we can start to deal with “attributes” and “properties” - Alignment of data from previous projects - In principle all “properties” and “attributes” have been dealt with as “objects” - There were not sufficient resources and experience available at the time when much of the data was migrated from Snapshot E (which did not make this (necessary distinction) - Template methodology was not in place. Data that should have been templates were therefore put other places - Most of the data is well defined, it just needs a different home - Some inconsistent naming and scope across projects made it hard to get a grip on what was there from before so that all the data from the IIP, DDR, and DPR projects can be used together - But a substantial set of data is there and is well defined - Migration to other entity types is required in some areas. This has been done to the extent necessary. - A substantial effort has gone into making this consistent, and we now have a good staring point - Developing and extending the current well/wellbore model has been required in order to put a model for both objects and activities in place

9. © Det Norske Veritas AS. All rights reserved. 14 January 2011 9 Safeguarding life, property and the environment www.dnv.com