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Changing the way you succeed.
Owen Kratz, Helix ESG Chairman and CEO
Well Intervention

What is well intervention?
 Well intervention is the ability to safely enter a well with well control for the
 purpose of doing a number of tasks other than drilling.
 Well intervention historically was done with drill rigs, with an 18-3/4” BOP and
 21” marine riser as the only means of well access with well control.
 In the 80’s, technology was developed that afforded for re-entry into wells with
 alternatives to the drilling well control systems and rigs for delivery of non-
 drilling services.
 As technology is developed, water depth increases, well head design evolves
 and well construction changes, intervention also evolves and demand grows.

Intervention Today

 Xmas tree recovery/installation
 Xmas tree/wellhead maintenance
 Choke change-out
 Light construction
 Saturation diving (inspection, repair & maintenance)
 ROV support services
Future Applications of Some Intervention Assets:
 Through tubing well intervention
 Top hole drilling
 Extended top hole drilling
 Riserless Mud Return
 Subsea Rotary Controlled Device
 Well flowback and Well testing
 Subsea Construction
Related Operations with Intervention Assets

Downhole Well Intervention Solutions

 ü First Subsea Intervention Lubricator
 operations in the North Sea
 ü First build and launch of dedicated
 intervention vessel -
 ü First coil tubing deployed on a
 subsea well from a rig alternative
 ü Build and operation of prototype
 ü First rig alternative
 decommissioning of offshore
 production facility with multiple
 subsea wells
 ü First application of Huisman
 multipurpose tower
Helix Intervention Industry Firsts

 As production goes to deeper water, subsea wells market grows.
 As the number of subsea wells increase and they age, the demand and
 frequency of required servicing through intervention grows.
 The market is in its infancy with huge growth potential.
Growing Market

Well Intervention Demand Drivers
Global offshore rig count
  Declining shallow water
 resources have spurred
 technical advances that allow
 offshore exploration and
 production in deeper, harsher
  New discoveries and
 pressure to improve recovery
 rates from developed fields
 increase demand for subsea
  Subsea trees are expected to
 increase at an 18.3% CAGR
 and global offshore rig count
 is expected to increase at a
 5% CAGR from 2010 to 2015
The global subsea intervention market is expected to expand as the focus of offshore drilling
shifts to more challenging environments
Source: Spears & Associates, Quest Offshore Resources

Intervention Needs Rises with Subsea Well Count
Source: Quest Offshore Resources
Subsea wells installed base (2002 - 2012)
Installed subsea completion base over 5 yrs
Installed subsea completion base 5 yrs
or younger
Note: Total installed base includes all subsea well completions from 1990, not adjusted for wells decommissioned 2007-2012
 Need for intervention typically
 occurs after 5 years of
 production, due to:
  Reduced pressure in wells
  Increased water or sand
  Scaling in wells
  Other factors
 Oil wells generally have a
 greater need for intervention
 than gas and injection wells

Market Outlook for Well Intervention
  Subsea intervention demand driven by increasing activity and rising
 subsea well counts
  Maintenance intensity expected to rise as greater share of production
 moves into deepwater fields and as operators face increasing oil
 recovery needs from maturing fields
  Global expenditures on intervention are expected to grow 11%
 annually from 2009 to 2014, reaching nearly $3.8 billion
Subsea well intervention expenditures
Source: Douglas-Westwood

2011 Market for Well Intervention Services
North America
SS Intervention spend: $470mm
Offshore rigs: 31
Offshore wells drilled: 260
Latin America
SS Intervention spend: $427mm
Offshore rigs: 88
Offshore wells drilled: 572
United Kingdom
SS Intervention spend: $272mm
Offshore rigs: 16
Offshore wells drilled: 157
SS Intervention spend: $303mm
Offshore rigs: 19
Offshore wells drilled: 188
SS Intervention spend: $746mm
Offshore rigs: 37
Offshore wells drilled: 531
Asia Pacific
SS Intervention spend: $375mm
Offshore rigs: 80
Offshore wells drilled: 1,072
Source: Douglas-Westwood, Spears & Associates

Regulatory Limitations
Vessel Class - Many independent classing societies
  Most Prominent - DNV (Det Norske Veritas), 
 ABS (American Bureau of Shipping)
  MODU Notation - Specific requirements for a vessel used in intervention
 including zoning for handling hydrocarbons.
  Government - No international standard. All strictly enforced by each country.
  Prescription vs. Safety Case
Client - Every client and sometimes every engineer has a different  set  of
compliance standards. Now driven by SEMS.
Industry - Many depositories of guidance principles.
  Voluntary Compliance
  Generally accepted by Industry but different clients will look at different
 sets of guidance.
  APL - Most generally accepted.

Wireline Deployment via SIL
 7-3/8” bore, 10ksi WP - single trip
 600 m water depth rated
 Various wireline & coiled tubing modes
 with sub-modes (long and short tools,
 Live well decommissioning & stimulation
  Balanced stabs with valves
 Modular design
  LRA / URA - VXT, HXT & CT riser
  URA only - VXT wireline
  Dual BOP position
 18.5 m or 22 m toolstrings
 Norwegian compliant
  Except DNV-E-101 re: QOD
 Minor lessons learned in next version

SIL Overview - MUX Controls
  MUX EH control system
  Mode Screens
  Auto Set Interlocks
  Configuration, Set Up & Test, Lifting Ops
  Slickline, Braided Line & Riser
  ROV electronics technology
  Grease system same as Seawell & Enhancer
  Not electric pump - seawater powered from surface
  No wireline shear upon subsea comms failure
  6hrs POOH - batteries & surface grease pump
  Auxiliary umbilical option to LRA / URA & extend
  ROV controls
  Full LRA WCE
  Primary URA safety functions
  Client Mimic Screen

Intervention Riser System for CT Deployment
 As water depth increases, the cost of intervention increases. If a problem
 is encountered, wireline alone is limited in being an effective
 remediation tool.
 To run coiled tubing into a well requires either an absurdly complicated
 well head mounted system or requires a riser back to the surface. This
 creates an extremely complicated interface occurring between the
 stationing riser and a tugging mooring vessel. These relative motions and
 the fact that the interface between the well’s high pressured hydrocarbons
 and the low ambient pressures on the vessel creates technical

Flow Tee and Swivel
Riser Centraliser
Moonpool Joint
Fatigue Enhanced Riser
Mid Joint Connector
Stress Joint
SIL including EDP
Multi Purpose Tower
Helix Coiled Tubing Setup

Vessels - Category A Intervention
 Category A - Wireline only deployed via a SIL. Typically a monohull due to
 build cost and spend of transit.
  Smaller the better to keep costs down commensurate with limited
  Limited deck area required for necessary equipment. $110 million and
 larger typically.
  Operability limited if size is so small that motions become too great for
 safe operating. Has even greater effect in harsh environments
  Water depth limited by seal technology and cost associated with
 complexity of system required to accommodate depth.

Vessels - Category A+ Wireline
 Category A + - wireline and coiled tubing deployed via SIL and sub 7” riser,
 i.e. drill pipe. Also typically a monohull.
 Greater capability with CT but unable to work full bore 7” which restricts
 what can be done.
 Advantage of being smaller and lower cost.
 Motions are high thus complexity is difficult.
 High motions result in narrow operating envelope resulting in more down
 time and higher risk if emergency disconnect is required. Smaller vessel
 makes it difficult to be able to operate on station in high seas.
 High motions adds to safety risk, i.e. man riding.

Vessels - Category A++ Intervention
 Category A ++ - Wireline and CT deployed via a 7” riser.
  Has full bore capability with coiled tubing through full 7” bore of the
  May have limited capability of pulling tubing.
  Size of the vessel increases deck space required for equipment and
 riser handling.
  Larger size vessels handle sea motion better.
  System required to compensate for motions is still relatively complex.
  Overall cost is now getting high.

Vessels - Category B Intervention
Category B - Semi Submersible
  Ample deck area
  Motions are the best and allows for less complexity and risk in systems
  Greatest number of applications possible.

Industry Considerations

 Determining which solution makes sense is a balance between
 small, low cost vessel with a complex high risk system. (Technology
 is not fully developed)
 Larger, high cost vessel with simpler low risk system.
 Primary Focus: Semi Platform Deploying IRS

Colin Johnston, Helix Well Ops Senior Engineer
Well Intervention
Fleet Overview

MODU DP3 Q4000
MSV DP3 Well Enhancer
Vessel of opportunity
MSV DP2 Seawell
Well Intervention Assets

Helix is the leader in subsea through-tubing
Global Reach
  24 years experience in the North Sea on more
 than 600 wells
  14 years experience in the Gulf of Mexico on
 more than 100 wells
  5 years experience in Australia & Sea East Asia
 on more than 20 wells
Successful application of prototype equipment
  Q4000 - IRS, HFRS, MPT, VDS
  Well Enhancer
Track record of cooperative contracting and
  Gulf of Mexico
  North Sea Collaboration - Multi client
  Helix Well Containment Group
Proven capability to manage:
  Marine vessels,
  Subsea systems
Subsea controls, downhole services, diving,
construction, and WROV operations
  Well Enhancer CT system
  WOUS IRS MUX upgrade
Providing World Class Intervention Services

History and Evolution - Seawell

History and Evolution - Well Enhancer

History and Evolution - Vessels of Opportunity

History and Evolution - Q4000

Where the value is found
 Efficiency - Main Driver
  Time efficient
  Cost efficient
  Campaign Based
  Shared across BU, Assets,
  Broad Functionality
  Minimal Built-ins
  Variable deck lay out
  Construction Support
  Construction and well intervention
  Seabed access and recovery
  Emergency Response
 Knowledgeable, integrated crews
 Integrated Onshore Management
 Assessment and investment in new
 Integration of Technology

Accommodation (122)
& project offices
18 man saturation
1 x WROV
1 x Obs ROV
Active heave-comp Derrick
Twin Crane & Well
Services spread:
Well test
  Main deck
  (Client supplied)
  Below deck
  2 x drill water tanks 258m3
  4 x bulk fluid tanks 240 m3 (1509 bbl)
  Derrick Lifting Capacity 80Te
  Crane 130Te (twin lift)
  2 x 15k psi OPI triplex pumps
Seawell Light Well Intervention Vessel

 Main deck
  1 x bulk fluid tank 150m3 (943bbls)
 Below deck
  2 x drill water tanks 90m3 each
  1 x bulk fluid tank 190m3
 Tower Lifting Capacity 100Te
 Crane 150Te
 2 x 10k psi SPM600 pumps
Well Services
Well test
Coiled Tubing
Active heave-comp Tower, Crane, Riser Handling & Skidding system
18 man saturation
1 x WROV
1 x Obs ROV
Accommodation (120)
& project offices
Well Enhancer Light Well Intervention Vessel

7 3/8” SIL in the Well Enhancer Tower
  5 1/8” SIL in the Seawell Derrick
7 1/16” SIL in the Seawell Derrick
Subsea Intervention Lubricators (SILs)

Well Enhancer - Overview
Tower, Riser Handling
& Skidding systems
Crane & Well Services
Well test
Coiled Tubing
  Tower Lifting Capacity = 150Te
  Tower Active Heave Comp = 130Te
  Crane = 100Te
  Guide Line Tensioner = 4 off (10te)
  Active Pod Line Tensioner = 2 off (15te)
  2 x SPM600 673kw 10k pumps
  1 x s/steel frac tanks = 200 m3 (1260 bbl)
  2 x drill water tanks = 190m3
  Deck tanks = >266m3

Flow Tee and Swivel
Riser Centraliser
Moonpool Joint
Fatigue Enhanced Riser
Mid Joint Connector
Stress Joint
SIL including EDP
Multi Purpose Tower
Well Enhancer Coiled Tubing Setup

Q4000 DP3 MODU Semi-submersible
 4,000 mT variable main deck load
 MPT Tower Lifting
 Capacity 600 mT
 Active and Passive Heave
 360 mT Huisman crane
 10,000 ft capacity traction
Well Services spread:
Well test
Coiled Tubing
Active heave-comp Tower, Crane,
Riser Handling & Skidding system
Accommodation (133)
& project offices

Well Ops 7-3/8” Intervention Riser System

Future Vessels
 Through tubing well intervention
 Top hole drilling
 Extended top hole drilling
 Riserless Mud Return
 Subsea Rotary Controlled Device
 Well flow back, well testing
 Subsea construction
 Subsea processing support
 Open Water Completions

Kurt Hurzeler, Helix Well Ops Commercial Manager
Well Intervention

Critical Skill Sets
 Specialized vessels and vessel
 Down hole & Service Options
 ROV expertise
 In-house Subsea expertise
 Construction expertise
 Saturation Diving expertise
 Multi Functional Crew Management
Vessel Functions
Adequate usable Deck space
Adequate Accommodation
Certified and classed for
hydrocarbons on deck
Lifting Capacity and Stability
Heavy weather dynamic positioning
Fluid storage and handling
IRS tubular handling and tensioning
Consistent Success Requires…

 Facilitate Wellbore Access
  Flexibility of system to interface with all subsea well types with minimal
  Provide systems on a day rate basis to reduce end user’s cost
  Minimize complication, deployment and testing time
  Reduce rig requirements and costs
 Reduce Decommissioning Liability
  Lower cost well abandonment
  Reliable and successful completion
 Improve Intervention Response
  Provide a rig alternative with 4 season capability.
  Minimize mobilization, demobilization and transit time
  Pre-engineer capability to allow rapid response for clients needs
  Stay in the field
 Provide Surveillance & Flow Assurance
  Reduce access costs for subsea production evaluation
  Reduce Inspection, Repair & Maintenance (IRM) Costs
Where the Value is Found

 Campaign Based
  Shared costs across BU’s, fields and operators
  Reduced transit time
  Minimal port and duty costs
 Construction Support
  Ability to carry out construction and well intervention
  Lift and/or transport heavy equipment from port to location, install via
 crane or drill pipe, assist platform operation
 Emergency Response
  Offshore fire fighting, diving and ROV support
  Ready availability, construction, accommodation, intervention and
 general operations support
Where the Value is Found

Operational overview - Seawell North Sea
The Client objective was to maximise
the operational functionality of the
MSV Seawell in order to complete the
following well workscopes:
Mechanical repair/well
Production logging
Mechanical repair/well maintenance;
tree change-out; well integrity
Well suspension operations
(temporary abandonment)
3 x well P&A and wellhead removal
Pumping - scale-squeeze operations

Operational overview - Seawell North Sea
 In field 16 days   Highlander Field
 In field 16 days   Tartan Field
 In field 14 days   Enoch / South Wood
 In field 17 days  Claymore
 In field 9 days   Tweedsmuir
5 1/8” SIL in the MSV Seawell Derrick

Seawell Operation summary
 Number of well locations = 7
 Water depth range = 90 - 141m
 Full demobilisation of 5 1/8” SIL in order to mobilise 7 1/16” SIL for TNT
 Total days = 68
  Vessel off-hire  0 days
  Wait on Weather  9.5 days 
  Uptime   58.1 days
 Well-work completed:
  4 Interventions (Well Maintenance & Production Enhancement)
  3 wells P&A’d (Decommissioning)
  All the above workscopes were supported with Saturation Diving operations
 All procedures developed and work supported by in-house WOUK project engineers

Q4000 Gulf of Mexico Snapshot

Q4000 Gulf of Mexico Snapshot

Q4000 Deck Layout for Well Stimulation
Deck Space- More is Better

Drilling module roofs with complete coiled tubing system, E
-Line, Slick Line, fluids and second WROV system
Intervention Deck Space and Positioning

 Coil-tubing Lift Frame
 Intervention Riser Package
 H4 Connector
 3rd Party Service Equipment
Critical Components Remain Onboard

280 MT Manifold being deployed
Construction - Dock to Seabed

 Seabed debris recovery
 Debris cap recovery and
 Flowline plug and burial
 Flowline clean out
  Jumper disconnect and
Construction - Concurrent Operations

Static Kill
Oil & Gas Burn
Dynamic Kill
Q4000 Versatility and Capabilities

 A unique combination of specialized skills and equipment
 A clear understanding of Client value
 Recognition of operational technical limits
 The means, ability and experience to manage and control diverse assets and
 personnel effectively and reliably
Helix Well Ops Provides