Helix WellOps UK

Subsea Expo

Helix Decommissioning Support

‘New Approach to P&A’

Ekene Ogbechie

Business Development Manager

Navigating the present, focusing on the future.

Agenda

2 Navigating the present, focusing on the future .

1. P & A Overview

• Traditional MODU approach

• Alternate Approach

2. Challenges

3. New Technology

• ROAM

4. Solutions

5. Helix Decommissioning Support

P&A Overview

Navigating the present, focusing on the future .

Traditional Approach

• Use of MODU & Jack Ups

• Use of 21” Marine Riser

• BOP Stack Use

• One size fits All from simple to complex well abandonments

P&A Overview

Navigating the present, focusing on the future .

Alternate Approach

• Use Of the ROAM

• On a Heavy Well Intervention Vessel

• 8.5/8” HP Riser rather than the 21” Marine Riser

• IRS Stack rather than BOP Use

• EDP/LRP

• TRT

• Abandonment application is tailored to well type and reservoir need (no

requirement for over loading equipment spread)

Challenges

Navigating the present, focusing on the future .

1. Environmental Containment

2. ESD

3. Deck handling

4. Regulatory approval

New Technology - ROAM

6

Layout

18-3/4” Re-entry mandrel

18-3/4” 10,000psi Annular BOP

18-3/4” 10,000psi Double BOP

–Shear & Seal rams

18-3/4” H4 connector

Flow spools with 3” stabs

2” circulation lines

Emergency Disconnect

OneSubsea Subsea Control Module

Functionality

– Normal Operations = Environmental Containment • Annular BOP and circulation lines

– Pressure Test & In-flow test

– Emergency = Well Isolation • Dual Shear-Seal Rams

• EQD functions

Lower overall cost of P&A

• De-risk P&A campaign by using Cost effective HWIV

– Enable logging behind casing by pulling Upper Completion

open water

– Full Well P&A capabilities by addressing remediation scenario

• Minimize use of Drilling Rig for P&A

New Technology - ROAM

7

ROAM

Workstring

HP riser, annulus pipe, umbilical

IRS w/ SJDF

Circulation Jumper

ROAM E/H controls

Wellhead

Phase 1 Reservoir (lower) barriers

Phase 2 Intermediate (upper) barriers

Phase 3 WH removal

Bullhead tubing Mechanical Plugs

cement plugs on CT/DP

Release & Recovery

Tubing retrieval

Permanent plugs Across/ recover

casings

Surface Plug Conductor removal Seabed Clearance

P&A operational steps with ROAM

– Full bore access

– Deployed in parallel over the side

– Unset and pull TH open water

– Enabler for Intermediate Abandonment

– Well Isolation capability

Well Preparation

HWIV + IRS

LWIV LWIV Diving Well prep (Barriers, injectivity test, drift run) Bull heading/ circulation Mechanical plugs Through tubing cement VXT recovery

As per LWI + CT mechanical access + CT cement placement

Open water Services with specialized tooling for cutting + Infrastructure Decommissioning + Seabed Clearance

MODU c/w CWOR MODU c/w BOP

Through Bore Full Bore

Q7000 + ROAM

LWIV +

Solutions

Navigating the present, focusing on the future .

1. Environmental Containment

1. Fully flushed well envelop to minimum of 30ppm (NS) or client specified

cleanness levels. Bottom (wellhead monitoring as well as at surface.

2. ESD

1. 2 X Shear Seal Ram (18.3/4” BOP Rams with capacity to cut casing).

3. Deck handling

1. Hanger & pipe handling system on vessel as well as NORM including

bonded laydown areas

4. Regulatory approval

1. Submission made to BSEE (GoM)

2. Submission to HSE as part of Q7000 safety case in Q1 2018

Q7000 – Efficiency gains

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Mobilisation, Transit , Set-up , in-field move & Demobilisation

Rig up & service change w/ Helix Tension Frame

– WL/SL/CT combined off centre, pre-stabbed & tested off-line

No dual bore riser requirement

– LRP/EDP deployment weather window is restrictive compared to IRS

ZERO man-riding & over side working

– Safe access gangway +/- 17° (+/– 4m hve) W2W system

– No requirement for Standby vessel to carry out close over

Deck skidding & auto pipe handling

Modular well test system in bunded area

ROV Deployment / Recovery

– Via cursor system to 18.5m water depth

Dedicated Multi skilled crew

11 Navigating the present, focusing on the future .

Helix Decommissioning Support

Helix Decommissioning Support

• All Inclusive Service Offering

• We own the assets

• Including vessels, SIL, IRS, ROV, Trenchers,

• Have relevant experience

• In house crew not 3rd party – many with 20yrs+ experience

• Includes marine, intervention, diving, ROV

• Single contracting

• Helix Well Ops ↔ Canyon ↔ One Subsea ↔ Schlumberger

• Contractual flexibility

• Risk/reward, lump sum, qualified TCE etc.

PM & Engineering │Pipeline Survey │Hot tap │Pipeline flushing │Pipeline

recovery │Pipeline trenching│Mattress recovery │Sat diving │Jacket diving │

Well work │ Facility removal │Structure Cutting │ Heavy lifts │ Wellhead removals │

│Seabed clean up │Overtrawl │Clearance certificate

12

Thank you

HLX Listed NYSE®

Follow Helix on Twitter - @Helix_ESG

www.linkedin.com/company/helix-energy-solutions-group

Navigating the present, focusing on the future .

30 Years as the leader in

Rigless Well Intervention

and P&A Services