W.E. AUDIT

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Morris Hall
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1 W.E. AUDIT Well Design Assessment - Well Construction Assessment - Well Control Assessment - Emergency Response Assessment - General Aspect Assessment - Final Conclusions

2 Preliminary information (+/- 6 month before spud) Prelim. Geol. Info Prelim well design Reservoir Pressure / Temp Targets Equipment and casing design Order Long Lead items Formation tops Well trajectory Drilling Fluids

Targets Equipment and casing design Order Long Lead items

3 Well Design Geological Proposal (GEP) Surface location Targets Formation tops Pore/frac diagram Lithology Data acquisition Drilling Program Casing design Equipment design Pore/frac diagram Lithology Data acquisition Detailed Drilling Guidelines Step-by-step program Lessons Learned from previous wells Submit to SSM 4 weeks before spud

$design Pore/frac diagram Lithology Data acquisition Detailed Drilling Guidelines$

4 Location / HSE Location restrictions Environmental area? Military area? Shipping lane? Infrastructure (wind mills)? Platform development or exploration? Well design Well trajectory Platform / subsurface Spud timing Platform interface SIMOPS Site survey Environmental survey required? Shallow gas? Rig placement issues? SSS&H document Site specific HSE issues HAZID Submit to SSM 4 weeks before spud

Well design Well trajectory Platform / subsurface Spud timing Platform interface SIMOPS Site survey

5 A: WELL DESIGN ASSESSMENT Requirements Valid Data Input Process Checks External Input Barrier Policy Pore Pressure Well design Rules Status - Mature Drilling Province - Ample Acces to Data wells - Interpretation by Experienced Staff - Quality Checks / Reviews included in process - Service Providers, R.A., HAZOP, SIMOP, Pre-Spud - Operate in UK Well Examiners - Clearly defined in WE Policy. - In line with NORSOK - In line with Regulations - Accurate offset data. - Input well design: highest anticipated pressure - Wintershall WE Policy - Safety Factors Casing Design - Worst Case Full Evacuation - Kick Tolerances defined/calculated - Casing Shoe optimum placed - Contingies (liner) available as req. - Standardise casing / tubing - Well trajectory plan (D.L., LOT, HP)

, HAZOP, SIMOP, Pre-Spud - Operate in UK Well Examiners - Clearly defined in WE Policy. - In line with NORSOK - In line with Regulations - Accurate offset data.

6 B: WELL CONSTRUCTION ASSESSMENT Activity / Issue Circulating to UB fluid Cement Design Cement Job QA & C Cementing Operations Casing Installation Criteria to drill ahead Management of change Method / Controls - Test barriers as required -Inflow test - Cement Integrity check - Multiple Simulations in/extern - Quality check experienced staff - Bench tests / sampling - Best Practices (Hole, Mud, Float) - Pumping rates, returns check - Best Practices Applied - CBL in production string - Test as per well design - Hangers positively locked - Test as per well design - Specified in programme - Well Integrity never comprimised - All parties informed - Amendments recorded

staff - Bench tests / sampling - Best Practices (Hole, Mud, Float) - Pumping rates, returns check - Best Practices Applied - CBL in production string - Test as per well

7 C: WELL CONTROL ASSESSMENT Activity / Issue Interface with Drilling Contractor Critical Well Control Issues BOP rating versus max CIP Shearrams functionality Remote BOP panels Method / Controls - Active Communication (daily) - R.A., HAZOP, Pre-spud etc -Change Procedure -Certification - Contingency Planning - Staff Training Competence - Instrumentation to monitor well - In line with well design - Function & P. Test as per specific well requirements (in programme) - Can cut DP in use - Good practices & planning - Hydril & Casing/Variable Rams - 3 pcs on NGS (Floor, Office, below cantilever). Accumulator Capacity - Satisfies Close-Open-Close condition with max. W.H.P. Certification W.Control Equipment. - Certified as per SMS - As Build, drawings in Rig S.Case

Test as per specific well requirements (in programme) - Can cut DP in use - Good practices & planning - Hydril & Casing/Variable Rams - 3 pcs on NGS (Floor, Office, below cantilever).

8 D: EMERGENCY RESPONSE ASSESSMENT Activity / Issue ESD during SIMOPS Blow out Contingency plan Relief Well Design Method / Controls - Procedures in Place (Rig, Platform, HSE, Bridging Document, SIMOPS) - Procedures in Place - Contracts in place - Equipment at short notice - Insurance coverage - Agreement with OSRL (Spills) - OCES upgraded by NOGEPA(Rig) - Coastguard, RWS roles defined - Fast access to reliable subsurface data - Location data available - Equipment / Services available ER Training Supervisory Staff - ERT included in staff development portfolio (also Well Control Skills) - Regular Drills ER organisation Office - Exercises held last Review Action Upgrade - ERC well equiped Rijswijk & Den Helder

Coastguard, RWS roles defined - Fast access to reliable subsurface data - Location data available - Equipment / Services available ER Training Supervisory Staff - ERT included in staff

9 Assessment of Emergency Response D4 Training of Drilling Supervisory Staff: Reference: Wintershall Skills development for E & P professionals Wintershall competence training modules for drilling staff. Training is complemented by on the job training, coaching by Senior Experts, Drills, (Emergency) Exercises etc. Drilling Engineering Staff will also work as DSV

10 E: GENERAL ASPECTS ASSESSMENT Activity / Issue Acceptance Criteria W.E. staff Method / Controls - Corporate Skill portfolio & development scheme - Opco specific detailed job description & competence requirements Well Contruction included in HSE M.S? Safety Case delivery process for Well Ops. Level of Supervision - Well Construction is one of the defined Processes under the M.S. - Process complete > EOW close out - H/O well : RCO / MAXIMO - Processes include R.A. and describe R & R - Coordination through Project Planning, daily updates etc. - Bridging Document to match M.S. - Full for all critical operations - Short Communication Lines, Fast Responses

Level of Supervision - Well Construction is one of the defined Processes under the M.S. - Process complete > EOW close out - H/O well : RCO / MAXIMO - Processes include R.

11 F: FINAL CONCLUSIONS Activity / Issue Well Design Comments - Sound, no changes required Well Construction Well Control - Proven techniques used and new techniques tried and implemented when Risk Reward balance positive. Low Error Avoidable NPT. - Adequate for our scope of Operations. Selection of competent & responsible Drilling Contractor crucial. Emergency Response General Aspects - Procedures in place and drills held. Improvements made when necessary. - Audit / Reviews: Frequency increase recommended. Service Providers to be included. - Documentation: W.E. Docs structure being upgraded to avoid duplication, inconsistencies etc. - Change Management to include routine/minor changes

Emergency Response General Aspects - Procedures in place and drills held. Improvements made when necessary. - Audit / Reviews: Frequency increase recommended.

12 F: STATEMENT CEO All justifiable measures have been taken, or are in the process of being taken, to ensure that the risk and environmental impact associated with the well delivery process are adequately managed at all times

risk and environmental impact associated with the well

13 Thank you Any questions?

14 Assessment of Well design A1 Well Planning Sequence Exploration/Appraisal Wells: Refer to Wintershall Process Management System Process Description includes roles of individuals taking Part in the process

Process Management System Process Description includes

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