GE Oil & Gas
Subsea Systems
Subsea Intervention
Completion Workover Riser System
Safe & Reliable
Well Access
The need for
subsea intervention
A long history of
subsea excellence
Various industry drivers are creating an increasing need for subsea
well access solutions:
GE Oil & Gas has been at the forefront of subsea technology for
many decades. Our technologies enabled some of the earliest
subsea developments and continue to advance with evolving
customer needs.
• Operators are under pressure to maximize recovery from
existing reserves. Although intervention is a proven technique
for increasing recovery, it has been uncommon for subsea fields,
contributing to their recovery rates being ~20% lower than wells
with direct vertical access. With the average subsea well now
over 10 years old, more operators are turning to intervention to
boost oil recovery
• Subsea fields are expected to grow to over 15% of global
production by 2020, through new fields and extensions of
existing fields
Noting these industry trends, GE has invested significantly to
develop improved well access solutions – beginning where we
have the most experience, in Completion Workover Riser (CWOR)
systems. Whether sold or rented, each system is backed by
comprehensive life-of-field support.
All GE equipment is supported by a global network of life-of-field
service centers and expertise. We continually invest in our regional
capabilities to ensure that our customers have the kind of support
their operations need. We maintain Global Centers of Excellence in
all key technology areas and, as part of the global GE organization,
we regularly take advantage of leading technologies developed
for other industries – always seeking to redefine possibilities. All
our activities are anchored in an unrelenting commitment to the
environment, health and safety, quality and reliability.
Our state-of-the-art wellheads, trees, manifolds and control
systems set the standard for equipment reliability and availability.
Our combination of highly flexible subsea well access systems and
best-in-class service expertise can help operators increase the
lifespan, safety and productivity of subsea wells.
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Unauthorized Reproduction Prohibited
Completion Workover
Riser System
GE’s Completion Workover Riser (CWOR) system is designed with
maximum configuration flexibility to facilitate the various challenging
activities required throughout the life of a field.
Plug & abandonment
Tree deployment
Life-of-Field
CWOR Operations
Well suspension
Well completion
Intervention for
maintenance, recovery
& enhancement
We are committed to developing and improving our CWOR technologies
through close collaboration with our customers and significant R&D
investment year over year. Our designs incorporate the latest ISO and API
standards and are continually proven reliable in a growing installed base
around the world.
Full System Integration
GE systems expertise ensures complete and flexible integration of our
CWOR system with existing vessel interfaces, subsea trees and other
supporting intervention equipment.
Our modular approach ensures that system configurations meet industry
standards and recommended practices, while allowing the customization
needed to meet each field’s unique requirements.
Operating Conditions
GE CWOR systems are available in bore sizes up to 7" and are designed
to operate in the industry’s most extreme operating conditions.
• Seawater depths down to 2,000 m – with technology development
under way that will increase this to 3,000 m
• Reservoir pressures up to 10,000 psi (690 bar)
• Temperatures up to 155°C
Safety & Certification
Safety is at the forefront of everything we do. GE’s CWOR system is
qualified in accordance with the most rigorous international standards,
including ISO13628-7 and API 17G.
To reduce operational risk, our CWOR Control System is independently
certified to IEC 61508/61511 Safety Integrity Level 2 (SIL 2).
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Key components – CWOR system
Heave Arrestor
• Isolates relative movement between the surface
tree and the vessel
• Increases efficiency of intervention operations and
increases the operational envelope
• Improves safety on the drill floor
• Stroke (length up to 10 m) increases the safe working
envelope of the vessel
Riser String
• Dual bore, mono bore and premium connection systems
• Available with GE RL or premium connections
• Riser monitoring system
• Surface trees
• Wireline adaptor
• Swivel joint, tension joint and slick joint
Safety Joint
• Protects the CWOR and well system against damage due to
accidental load effects caused by excessive top tension
• The safety function operates passively, without the need for a
control signal
• Protection load is tunable, and is set as required by the field
specific Global Riser Analysis
• Pressure-balanced design means that the protection load can
be set independent of internal bore pressure
• Remote hydraulic lock/unlock function enables activation of the
safety function only when the CWOR is tree-connected
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Unauthorized Reproduction Prohibited
Emergency Disconnect Package (EDP)
• Provides riser containment during Emergency Quick Disconnect
(EQD) or controlled disconnect
• Incorporates the upper half of the High Angle Release connector
• Houses the subsea Workover Control Module (WOCM)
High Angle Release (HAR) Connector
• Enables Emergency Quick Disconnect (EQD) and controlled
disconnect of the EDP and LRP
• No restriction on disconnect angle
• Increases vessel operational window
• Guideline or guidelineless operation
• Configurable control coupler interface
• True 2" ID control coupler (optional)
Lower Riser Package (LRP)/Well Control
Package (WCP)
• Provides well barrier control during intervention
• Provides well barriers to allow for subsea disconnection
• Includes valves and rams which provide the capability to cut
coiled tubing/wireline and shut the well in case of an Emergency
Shutdown (ESD) or Emergency Quick Disconnect (EQD)
• Incorporates the lower half of the High Angle Release connector
• Tree connector
Tree Adaptor
• Optional adaptor to interface with non-GE tree mandrels
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Key components – Workover Control System
Surface Control Unit (SCU)
• Standard 20-foot offshore manned controls container to DnV 2.7-1 & 2.7-2
• Dual compartment with air conditioned and positive pressurized sections
• Manned section with two operator work stations
• Dedicated instrument Uninterruptible Power Supply (UPS) and Master Control
System (MCS)
• Interface to drilling rig/workover vessel utilities, information and safety systems
Master Control Station (MCS)
• Integral redundant PLC-based control systems meeting ISO 13628-6 & -7
and API 17G, for all operational modes
• Safety Integrity Level 2 (SIL-2) certification to OLF Guidelines 070, Annex 14,
Figure A23
• HMI and control interface to CWOR, LRP and subsea tree
• Remote control panel and manual shutdown/quick disconnect control stations
remote facilities
• Control execution and monitoring displays through operator workstations
Umbilical & Reel
• Open-water landing string and lubricator valve umbilicals as required
• Surface-to-subsea controls equipment link for control and injected chemicals
• Optimized thermoplastic cores and layup to ISO 13628-5, reducing cross
sectional area for easier handling and storage
• Features include manual lock-out and fail-safe braking devices
• Local and remote control facilities
Hydraulic Power Unit (HPU)
• Standard 20-foot offshore manned controls container to DnV2.7-1
• Dual pressure-level supply manifolds, electric or pneumatic driven hydraulic pumps
• Manual adjustable supplies for seal test
• Remote controlled with manual override hydraulic outputs
• Biodegradable hydraulic control fluid to SAE AS 4059 Class 6 level
• Manual and autonomous control through integral PLC and MCS
Workover Control Module (WOCM)
• Mounted on the emergency disconnect package (EDP) to control all normal and
safety critical functions
• Available as a high-function count variant, enabling increased CWOR functionality
• Modular, flexible and adaptable structured design
• Compatible with Production Control System equipment
• Integral award winning SemStar5 subsea electronics module
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GE © 2013 – All Rights Reserved
Unauthorized Reproduction Prohibited
The Workover Control System (WOCS) provides
electro-hydraulic multiplexed control of the
CWOR system during deployment and subsea
operation.
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GE Oil & Gas
geoilandgas.com
Subsea Services
Center of Excellence
2630 The Quadrant
Aztec West
Bristol BS32 4GQ, UK
T +44 1179 463 618
The information contained herein is general in nature
and is not intended for specific construction, installation
or application purposes. GE reserves the right to make
changes in specifications or add improvements at any
time without notice or obligation.
Subsea Systems Headquarters
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Aberdeen AB23 8GD, UK
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©2013 General Electric Company
All Rights Reserved
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