planning to avoid a catastrophe

Tullow Oil: Planning to avoid a catastrophe

Tullow Oil

Planning to avoid a catastropheSeptember 2019


WELL ENGINEERING AS PART OF CONTROLS AND BARRIERS

Slide 2

• The critical role Drilling Engineering has in the “prevention side” of the “Loss of Containment” bow-tie.

• The key inputs and outputs for safe and effective well design• OGP 463 – Key recommendations for incident reduction


OGP Deepwater Wells: Global Industry Response Group Report 463 May 2011

In July 2010, the International Association of Oil and Gas Producers (OGP) formed a group in the aftermath of the tragic accidents on the Macondo prospect, Montara and other similar accidents.

Previously the industry had drilled 14,000 deep water wells without a major incident but, these accidents were a stark reminder of the risk inherent in such operations.

The OGP report 463 identified three areas to focus improvements:-

• Prevention: developing better capabilities and practice in well engineering design and well operations management in order to reduce the likelihood of future incidents;

• Intervention: improving well capping response readiness (in the event of an incident) and to study further the need for, and feasibility of, global containment solutions;

• Response: delivering effective and fit-for-purpose oil spill response preparedness and capability.

LEARNING FROM INCIDENTS

Slide 3


• A 3 Tier Review Process : - Regular Self Audit - Independent Oversight- Regulator

• Human Competency Management: - Formal Competency Management System- Deeper understanding and awareness of Well control

• Recognition of existing National and International Standards.

• Improved Technical and Operational Practice for the overall governance of Well Construction

- Well Management System with Management of Change process, full well life –cycle- Operator “Technical Authority”- Well Control Bridging documents established between Operator and Drilling Contractor

• Two Barrier Policy- BOP as 1 barrier. Configuration / Certification. Redundancy. Function and pressure testing

• Creation of a permanent Wells Expert Committee (WEC)

KEY OGP 463 “PREVENTION” RECOMMENDATIONS

Slide 4


• Most Operating Companies now have a Management System that defines Policies, Standards and Guidelines for planning and execution of well work.

• Many Operating Companies define a Process that defines tasks that must be executed when planning a well.

• Most operating Companies now have a Competency Management System

• Tasks must be performed by competent professional engineers with adherence to Policies, Standards, and Guidelines.

• Human Factors Training and Scenario Based Well control training are being implemented to improve depth and breadth of well control training.

• Often peer reviews are used as means of ensuring process is followed and ideas and issues are not overlooked.

• Some Operators use “Well Examination” as part of the 3 Tier Review

• The objectives of the systematic approach is to assure best practice is applied.

• Most Operators now have a “Barrier Policy”

• BOP certification and functionality is addressed rigorously – including verification and pressure testing.

ROLE OF WELL ENGINEERING AS A BARRIER AND CONTROL

Slide 5


WELL DELIVERY PROCESS - ENGINEERING

Slide 6

Concept Design Planning Ops Close-Out

• Initial Peer Review (Conceptual Well Cost Estimate (+/- 25%)

• Conceptual Well Design

• Kick-Off Meetings • Offset Well Review • Lessons Learned

Review • Environmental

Permitting• Contracting Strategy &

Register• Rig Identification

• Detailed Well Design & Peer Review

• Contracting & Procurement

• Consents & Permitting Register

• Relief Well Planning• P&A Design• Final Equipment & Rig

Identification• Shore Base

Inspections• Supplier Quality

Management

• Operations Readiness Review / Approval Gate

• Well Examination• Final Well Cost

Estimate (+/- 10%)• Drill Well On Paper• Capping Stack

Selection & Notification

• Subsea Well Containment Logistics Plan

• Contingency Planning• Well Operations

Management Plan• Well-Specific

Operational Plan• Well Clean-up HAZOP

Study

• Daily Reporting & Communications

• Final Preparations• Drilling Operations• Well Integrity

Checklist• Contractor

Management• Weekly Cost Reporting• Advanced Planning

Meetings & After-Action Reviews

• Failure Investigation Reporting

• Non-Conformance Reporting

• Well Examination

• End-of-Well Report• Well Performance

Memorandum• Final Well Cost

Reconciliation• Definitive Well Survey• Lessons Learnt

Register• Well Integrity

Checklist• Well Suspension/

Abandonment Schematics

• Materials & Equipment Reconciliation

• Supplier Performance Management


Key Inputs

KEY INPUTS INTO WELL CONCEPT DESIGN

Slide 7

Well Engineering

Geological Well Proposal

Shallow hazards Analysis

Pore Pressure / fracture gradient

Modelling

Offset Well Data

Conceptual Well Design

Casing Design

Kick Tolerance

Casing Point selection

Key Outputs

Well Engineering Management

System

Pier Review


Key Inputs

KEY INPUTS INTO DETAILED WELL DESIGN

Slide 8

Well Engineering

Geological Well Plan

Soil Strength Data

Equipment Specifications


Key Outputs


System

Basis of Design

Met-Ocean Data

Pier Review


Key Inputs

KEY INPUTS INTO OPERATIONAL PLANNING

Slide 9

Well Engineering

Rig Selection & Specification

Service Company Information

Equipment Specifications

Well Eng. Basis of Design

Key Outputs


System

Well Specific Drilling

Programme

Riser and Conductor Fatigue

analysis

Pier Review

Local Regulations and Permit inputs


KEY CONTINGENCY PLANNING AND PREPARATIONS

Slide 10

Well Engineering

Blow out modelling

Oil Spill Modelling

Dynamic Well Kill Modelling

Blow out Response Planning


Geological / Reservoir

Engineering Input

Met-Ocean Data

Soil Strength Dta

Capping and Containment logistics plan

Emergency Response Plans

Specialist Resources

Rig Specific Data


BLOW OUT PREVENTER TESTING AND ACCEPTANCE

Slide 11

Rig Acceptance

3rd Party BOP Verification and

Acceptance

Ongoing Operational

testing

Drilling Rig Contracted

Pre-Contract Inspection

Any safety Critical deficiencies will be

identified and closed out in advance of

contract commencement

Rig Commences /Continues to

work

Deficiencies Identified and repaired

• Key reference : API S-53


• In 2011 OGP 463 identified a number of important industry wide improvements focused on design and operations management that would drive a reduction in the likelihood of future incidents.

• Most Operators now fully implement these recommendations.

• Significant effort is systematically devoted to rigorous well design to ensure that the risk of a loss of containment is very small.

• Significant effort is also systematically devoted to contingency planning to ensure that in the unlikely event of a loss of containment recovery measures can be swiftly implemented .

• Acceptance testing of BOP equipment is recognised as being safety critical. Independent 3rd party verification of BOP equipment considered good practice. Regular pressure testing and function testing mandatory for most operators.

SUMMARY AND CONCLUSIONS

Slide 12


Tullow Oil plc9 Chiswick Park

566 Chiswick High RoadLondon, W4 5XTUnited Kingdom

Tel: +44 (0)20 3249 9000Fax: +44 (0)20 3249 8801Email: [email protected]

Web: www.tullowoil.com

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