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(1)

-

Well Design Assessment

-

Well Construction Assessment

-

Well Control Assessment

-

Emergency Response Assessment

-

General Aspect Assessment

(2)

09.12.2010 2

Preliminary information

(+/- 6 month before spud)

Prelim. Geol. Info

z

Reservoir

Pressure / Temp

z

Targets

z

Formation tops

Prelim well design

z

Equipment and

casing design

z

Well trajectory

z

Drilling Fluids

Order Long

Lead items

(3)

Well Design

„

Geological Proposal

(GEP)

z

Surface location

z

Targets

z

Formation tops

z

Pore/frac diagram

z

Lithology

z

Data acquisition

„

Drilling Program

z

Casing design

z

Equipment

design

z

Pore/frac

diagram

z

Lithology

z

Data acquisition

„

Detailed Drilling

Guidelines

z

Step-by-step

program

z

Lessons Learned

from previous

wells

Submit to SSM 4 weeks before

spud

(4)

09.12.2010 4

Location / HSE

„

Location restrictions

z

Environmental

area?

z

Military area?

z

Shipping lane?

z

Infrastructure

(wind mills)?

z

Platform

development or

exploration?

„

Well design

z

Well trajectory

z

Platform /

subsurface

z

Spud timing

z

Platform

interface

z

SIMOPS

„

SSS&H document

z

Site specific HSE

issues

z

HAZID

Submit to SSM 4

weeks before spud

„

Site survey

z

Environmental

survey required?

z

Shallow gas?

z

Rig placement

issues?

(5)

Requirements Status

Valid Data Input Process Checks External Input

- Mature Drilling Province

- Ample Acces to Data + 2000 wells - Interpretation by Experienced Staff

- Quality Checks / Reviews included in process

- Service Providers, R.A., HAZOP, SIMOP, Pre-Spud - Operate in UK – Well Examiners

Barrier Policy - Clearly defined in WE Policy. - In line with NORSOK

- In line with Regulations Pore Pressure - Accurate offset data.

- Input well design: highest anticipated pressure Well design Rules - 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)

(6)

09.12.2010 6

09.12.2010 6

Activity / Issue Method / Controls

Circulating to UB fluid - Test barriers as required - Inflow test

- Cement Integrity check Cement Design

Cement Job QA & C

- Multiple Simulations in/extern - Quality check experienced staff - Bench tests / sampling

- Best Practices (Hole, Mud, Float) - Pumping rates, returns check Cementing Operations - Best Practices Applied

- CBL in production string - Test as per well design Casing Installation - Hangers positively locked

- Test as per well design Criteria to drill ahead - Specified in programme

- Well Integrity never comprimised Management of change - All parties informed

- Amendments recorded

(7)

Activity / Issue Method / Controls

Interface with Drilling Contractor - Active Communication (daily) - R.A. , HAZOP, Pre-spud etc Critical Well Control Issues -Change Procedure -Certification

- Contingency Planning

- Staff Training – Competence - Instrumentation to monitor well BOP rating versus max CIP - In line with well design

- Function & P. Test as per specific well requirements (in programme)

Shearrams functionality - Can cut DP in use

- Good practices & planning - Hydril & Casing/Variable Rams

Remote BOP panels - 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

(8)

09.12.2010 8

09.12.2010 8

Activity / Issue Method / Controls

ESD during SIMOPS - Procedures in Place (Rig, Platform, HSE, Bridging Document, SIMOPS)

Blow out Contingency plan - 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

Relief Well Design - 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 16-10-08 - Review – Action – Upgrade

- ERC well equiped Rijswijk & Den Helder

(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)

09.12.2010 10

09.12.2010 10

Activity / Issue Method / Controls

Acceptance Criteria W.E. staff - Corporate Skill portfolio & development scheme - Opco specific detailed job description & competence

requirements

Well Contruction included in HSE M.S ? - Well Construction is one of the defined Processes under the M.S.

- Process complete > EOW close out - H/O well : RCO / MAXIMO

Safety Case delivery process for Well Ops.

- Processes include R.A. and describe R & R

- Coordination through Project Planning, daily updates etc. - Bridging Document to match M.S.

Level of Supervision - Full for all critical operations

- Short Communication Lines, Fast Responses

(11)

Activity / Issue Comments

Well Design - Sound, no changes required

Well Construction - Proven techniques used and new techniques tried and

implemented when Risk – Reward balance positive. Low Error Avoidable NPT.

Well Control - Adequate for our scope of Operations. Selection of competent & responsible Drilling Contractor crucial.

Emergency Response - Procedures in place and drills held. Improvements made when necessary.

General Aspects - 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.

(12)

09.12.2010 12

09.12.2010 12

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.

(13)

Thank you

(14)

09.12.2010 14

09.12.2010 14

Assessment of Well design A1

Well Planning Sequence Exploration/Appraisal Wells:

Process Description includes roles of individuals taking Part in the process.

Refer to Wintershall Process Management System

References

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