-
Well Design Assessment
-
Well Construction Assessment
-
Well Control Assessment
-
Emergency Response Assessment
-
General Aspect Assessment
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
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
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?
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)
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
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
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
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.
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
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.
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.
Thank you
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.