DDR Drilling and Well model

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

2. Re-use of existing drilling and well model An assembly of downhole tubulars and equipment required to enable safe and efficient production from an oil or gas well. 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. WELL COMPLETION COFO WELL CASING WELL LINER WELL TUBING WELL COMPLETION ASSEMBLY WELL ASSEMBLY WELL COMPLETION STRING HANDLING COFO COFO COFO COIPO COA WELL CONDUCTOR CASING WELL PRODUCTION CASING WELL CASING ASSEMBLY WELL LINER ASSEMBLY WELL TUBING ASSEMBLY WELL SURFACE CASING WELL INTERMEDIATE CASING COIPO COIPO COIPO WELL CONDUCTOR CASING ASSEMBLY WELL SURFACE CASING ASSEMBLY WELL PRODUCTION CASING ASSEMBLY WELL INTERMEDIATE CASING ASSEMBLY WELL COMPLETION STRING CLASS http://www.osh.dol.govt.nz/publications/booklets/geothermalwells2005/pg2.shtml

3. Extending the drilling and well model WELLBORE 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. DRILLING ACTIVITY #N-4 REPORTING PERIOD #n DEPTH AT START DRILLING REPORT PERIOD #m HOLE MADE DURING DRILLING REPORT PERIOD BIT MMM RUN #i-1 DRILLING ACTIVITY #N-3 DRILLING ACTIVITY #N-2 BIT MMM RUN #i DRILLING ACTIVITY #N-1 BIT NNN RUN #j DEPTH AT START DRILLING ACTIVITY #N HOLE MADE DURING DRILLING ACTIVITY #N DRILLING ACTIVITY #N BIT MMM RUN #i+1 HOURS DRILLED DURING RUN REPORTING PERIOD #m DEPTH AT END DRILLING ACTIVITY #N BIT RUN IN REPORTING PERIOD HOURS DRILLED IN REPORTING PERIOD DEPTH AT END DRILLING REPORT PERIOD #m DRILLING ACTIVITY #N+2 BIT NNN RUN #j+1 REPORTING PERIOD #n BIT NNN RUN #j+2 DRILLING ACTIVITY #N+3 REPORTING PERIOD #o REPORTING PERIOD #p

4. Main classes and individuals HOLE CEMENTING CEMENT GROUT DRILL BIT BOREHOLE (New entity type) WELLBORE DRILLING CASING ACTIVITY WELLBORE DRILL BIT RUN WELLBORE CEMENTING WELLBORE CEMENT GROUT ROCK DRILL BIT WELLBORE (New entity type) WELL CASING ACTIVITY DRILLING RIG REPORT THE ACTUAL WELLBORE DRILL BIT RUN THE ACTUAL WELLBORE CEMENTING THE ACTUAL CEMENT GROUT THE ACTUAL ROCK DRILL BIT THE ACTUAL WELL CASING ACTIVITY THE ACTUAL WELLBORE THE ACTUAL RIG #NN THE ACTUAL REPORT WELL CASING ASSEMBLY WELL CASING WELL CASING STRING LINING WELL TUBING REPORTING PERIOD THE ACTUAL WELL CASING ASSEMBLY THE ACTUAL WELL CASING THE ACTUAL WELL CASING STRING THE ACTUAL LINING THE ACTUAL WELL TUBING DRILLING CEMENTING EQUIPMENT CLASS ARTEFACT CLASS “LINING” is too general. Introduce “WELLBORE” where required?

5. Design Basis • 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. DDR “Drill bit” = ROCK DRILL BIT DRILL BIT ROCK DRILL BIT DIAMOND DRILL BIT SCREWTYPE DRILL BIT DULL ROCK DRILL BIT CORE DRILL BIT FIXED CUTTER DRILL BIT ROLLER CONE DRILL BIT ROCK DRILL BIT 14 3/4 NS ROCK DRILL BIT 36 NS ROCK DRILL BIT 14 3/4 NS 13 3/4 COID ACME INC. WIDGET ALPHA NS 14 3/4 NS ACME INC. WIDGET ALPHA COID THE WELLBORE DRILL BIT

7. Modelling and mapping example - DDR Rock Drill Bit Size (in) DAILY DRILLING REPORT ROCK DRILL BIT SIZE CODE ASSIGNMENT CLASS DAILY DRILLING REPORT ROCK DRILL BIT SIZE CODE STRING CLASS DAILY DRILLING REPORT ROCK DRILL BIT CLASS COCOId ARTEFACT DRILL BIT ROCK DRILL BIT ????? BIT represented pattern ROCK DRILL BIT 14 3/4 NS Size (in) 14 3/4 COId DDR ROCK DRILL BIT SIZE TEMPLATE SIGNATURE “OBJECT IN FOCUS” 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. Status • 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. Safeguarding life, property and the environment www.dnv.com