Well Barrier Schematics - Practical Use.pdf 275s13

How to make best use of Well Barrier Schematics (WBS)

Can happen again!

However, the next disaster will not duplicate this one

The well integrity tool that helps you to … … select the optimal well barrier solution – Choose and compare from 250 available illustrations

… clearly identify well barrier elements and envelopes – Validation and acceptance criteria, monitoring of parameters

… communicate well barriers to stakeholders – Offshore team, service providers, authorities, partners, your boss

… prepare well shut in sequence – How to regain control in the event of failure / leak

… risk assess robustness of well barrier elements – Weak link? Degradation? What happens if it leaks?

The value of illustrations • Would you consider the safeguarding of a process plant without a P&ID?

• Would you consider the safety of a well and its well barriers without a Well Barrier Schematic (WBS)?

... probably not!

Prepare a draft well illustration Make a basic hand sketch of your well – Show casing program – Show reservoirs relative to casing depth – Show BOP/x-mas tree or intervention equipment arrangement

Identify the barrier envelopes Identify • Primary well barrier – The elements that are directly exposed to the formation pressure

• Secondary well barrier – The elements that provide a back-up to the primary – Define this envelope as the ultimate defence, often with shear seal rams closed

Find the appropriate WBS drawing • Enter the www.wellbarrier.com webside and find the appropriate drawing – 250 configurations available – Available as thumbnail pictures on front page

• New drawings are made as part of the subscription

Prepare the WBS form • Chose type of form – – – – – –

1. Chose form type

2. Add well specific information

3. Annotate illustration with information like casing depth

Qualification planning Monitoring during well activity As built Monitoring during well life Well control action diagrams Risk assessment (coming)

• Input well specific information – – – – – –

Field and well number Verified by Drawing annotation Test pressure, etc Notes Annotate

• Save • Export to your PC

Insert WBS in ... Drilling and well program

Plans for Development and Operation

Final report

Well handover document

Communication documents

Presentations

Incident investigation report

Well data base

Planning purposes • Prepare a diagram with details for planning purposes, including all associated WBEAC’s • Use the “Barrier qualification planning” form when you prepare the procedures

Procedure attachment • This will make available clear illustrations to all stakeholders • Include in the procedure the form that is most useful – Qualification – Monitoring – Well control action

Document as built • The form should be part of the handover documentation to operations specifying how each installed barrier element has been qualified • May also be used for P&A wells • To be stored in well file

Define life time monitoring • The form should be part of the handover documentation to operations specifying how to monitor each installed barrier element • The form should also contain the frequent test acceptance criteria

Define Well Control Actions (WCA) • In the event that the primary barrier fail – what do you do? • Discuss this plan with the crews before the event • Particularily to be used for new, unfamiliar og high risk operations • Include the plan in the procedure

Plan field developments • Use the illustrations in discussion when you consider different solutions – Set casing above or in reservoir? – Where to set top of cement? – Screens or cemented liner?

Plan well interventions • Use the illustrations to show complex and unfamiliar rig-up and running scenarios • Define components that are required • Think about the shut-in sequence • Make these available in the procedures

Plan P&A • Think ahead when you plan the well, one day it will have to be abandoned – Is the cement in place where it should be? – Shallow and deep set plugs? – Is the formation strong enough to contain the maximum pressure? – What happens if the elements in the primary barrier fails?

Make risk assessment • Scrutinize each well barrier element • Define failure mechanisms and detection methods • Establlish probability and consequences of failures • Define compensating measures (if any) • Define monitoring

Do you have a robust solution?

Basis for discussion Use it to …

… show consequence of casing setting depth in drilling phase

…show P&A arrangements

… show complex intervention arrangements

We give you the tool to do all this Allowing you to make professional illustrations with a minimum effort … … so you can spend better time on evaluating the actual solution!

… to stay calm

Photo by Heidi Runnekås, Statoil