Subsea Control Systems - Weatherford International
Subsea Control Systems - Weatherford International
Subsea Control Systems - Weatherford International
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<strong>Subsea</strong> <strong>Control</strong> <strong>Systems</strong><br />
<strong>Weatherford</strong> <strong>International</strong> Ltd.<br />
515 Post Oak Blvd., Suite 600<br />
Houston, Texas 77027 USA<br />
Tel: 713-693-4000<br />
weatherford.com<br />
Production Optimization<br />
<strong>Weatherford</strong> is a leading provider of multiplex subsea, surface<br />
wellhead, and integrated control systems for enhancing oil and gas<br />
production. The electro-hydraulic multiplex subsea control system is<br />
a modular design concept that incorporates well-proven technology<br />
and qualified components to optimize production and minimize costs.<br />
<strong>Weatherford</strong>’s integrated system provides the requisite monitoring,<br />
control, and shutdown functions by means of multiplexed electrohydraulic<br />
control, using communications on power between a surface<br />
master control station (MCS) and subsea control module (SCM) via<br />
a composite services umbilical, and appropriate subsea distribution<br />
unit(s).<br />
Communications between surface and subsea are by means of a<br />
LonWorks ® power-line carrier. Communications can be adapted to suit on power, twisted pair, or fiber<br />
optic, depending on configuration.<br />
The system is designed for deployment and intervention by means of a remotely operated vehicle (ROV),<br />
assisted guideline, and guideline-less running tool (available for rental with ROV assistance in very deep<br />
water). The ROV features a simple sliding-plate design with locking down mechanism. A similar module is<br />
also available for diver installation.<br />
The subsea electronics module (SEM) is surface removable and replaceable without the need to disturb<br />
the module’s hydraulics chamber. Electric and hydraulic connections are made with low-force connectors<br />
mounted on the base of the unit; they connect when the unit is locked into place.<br />
The SCM housing is filled with dielectric fluid prior to installation and is pressure-compensated to<br />
safeguard against over or under pressurization. The SCM housing is fabricated from structural steel<br />
manufactured to BS EN 10 025 Grade Fe430C or Fe510 D1/D2 and finish painted to <strong>Weatherford</strong>’s<br />
standard subsea paint specifications. All hydraulic and electric couplings are manufactured from 316<br />
stainless steel (SS) or higher grade materials.<br />
The hydraulic system consists of self-latching, solenoid-operated, shear-seal, directional-control<br />
valves, mounted on a SS block manifold, with single or dual hydraulic supplies, depending on client’s<br />
specifications. Electrically held-open valves also can be mounted in the unit for emergency shutdown<br />
(ESD) system functionality, if required.<br />
Individual high-pressure (HP) and low-pressure (LP) hydraulic supply filters are mounted within the<br />
control module to maintain fluid cleanliness specifications. Both types of hydraulic supply filters have<br />
pressure transducers to indicate system pressure within the control module.<br />
The tree valve hydraulic actuator’s inferred status is sensed by individual pressure transducers, integral<br />
to the directional control valves, which relay the function line pressures to topside, where they may be<br />
displayed on the master control station (MCS) screen; they can also be made available to the distributed<br />
control system (DCS) platform control system.<br />
© 2008 <strong>Weatherford</strong>. All rights reserved. 5347.00
<strong>Subsea</strong> <strong>Control</strong> <strong>Systems</strong><br />
<strong>Subsea</strong> <strong>Control</strong> Module (SCM)<br />
<strong>Weatherford</strong> <strong>International</strong> Ltd.<br />
515 Post Oak Blvd., Suite 600<br />
Houston, Texas 77027 USA<br />
Tel: 713-693-4000<br />
weatherford.com<br />
(2)<br />
Production Optimization<br />
An accumulator can be accommodated within the control module to help prevent pressure drop during<br />
valve operations on large step outs; alternatively, separate subsea-accumulator modules can be provided<br />
to maintain local pressure levels.<br />
Electronics<br />
The subsea electronics are enclosed in a 1-atmosphere dry nitrogen-purged housing located within the<br />
main SCM housing, with proprietary penetrators to allow connection to the SCM. Within the SEM housing,<br />
ambient temperature and pressure are continually monitored; an alarm may be sent to the MCS should<br />
abnormal conditions arise.<br />
The SCM incorporates dual 230-Vac at 50 Hz power supplies and uses a super-imposed, high-frequency<br />
carrier on each power line, along with the LonWorks network communications protocol, enabling control<br />
and monitoring via either or both power/communications lines.<br />
The SEM will operate with a twisted-pair communication line and separate power supply, or with a powerline<br />
carrier. Using a power-line carrier reduces umbilical costs and also provides performance benefits.<br />
The subsea electronic control and communication system is based around the neuron 3150 processor<br />
chip, with the surface being PC/PLC based. Responses from the surface or subsea units are propagated<br />
back to the PCS via a ModBus ® -compliant serial channel from the MCS. The SEM also runs diagnostics<br />
showing the state of all power supplies and communications. Bad communications are detected and<br />
rejected to prevent incorrect data from causing unpredictable actions.<br />
Diagnostic tools and displays are available to the operators via the topside MCS.<br />
Unit Characteristics<br />
• Four HP hydraulic outputs<br />
• LP hydraulic outputs (22)<br />
• Dual HP hydraulic inputs via shuttle valve<br />
• Dual LP hydraulic inputs via shuttle valve<br />
• HP-ESD valve<br />
• LP-ESD valve<br />
• Directly mounted digital control valves to single manifold block<br />
•<br />
HP and LP vents to sea or closed loop returns<br />
© 2008 <strong>Weatherford</strong>. All rights reserved. 5347.00
<strong>Subsea</strong> <strong>Control</strong> <strong>Systems</strong><br />
<strong>Subsea</strong> <strong>Control</strong> Module (SCM) (continued)<br />
<strong>Weatherford</strong> <strong>International</strong> Ltd.<br />
515 Post Oak Blvd., Suite 600<br />
Houston, Texas 77027 USA<br />
Tel: 713-693-4000<br />
weatherford.com<br />
(3)<br />
Production Optimization<br />
External Standards<br />
• Carbon steel-fabricated housing, painted to standard subsea paint specification<br />
• Installation and intervention by ROV-assisted running tool or diver onto mounting base<br />
• Dielectric fluid filled pressure compensated housing and atmospheric SEM housing<br />
• Designed for use up to 10,000 ft (3,000 m) of water<br />
• 1.5-atmosphere nitrogen-filled electronics housing with temperature monitoring<br />
• Dual HP and LP supplies, incorporating individual hydraulic supply line filters with B3 = 200 rated<br />
elements<br />
• <strong>Control</strong> of hydraulic valve actuators by stainless steel body, sheer seal-type solenoid valves<br />
• Earth strap for bonding and low resistance connection to the module mounting base on the manifold<br />
cathodic protection system<br />
• Connection points legibly identified by proprietary laminated nameplates<br />
• Stand-alone sacrificial anodes for cathodic protection are provided, based on isolation for six months on<br />
the seabed<br />
•<br />
Two outgoing electro-hydraulic ROV/diver stabplates, both mounted on SCM mounting base<br />
© 2008 <strong>Weatherford</strong>. All rights reserved. 5347.00
<strong>Subsea</strong> <strong>Control</strong> <strong>Systems</strong><br />
Specifications<br />
Environmental data<br />
Water depth - LAT (ft/m)<br />
Operating temperature Range<br />
9,843<br />
3,000<br />
Surface unit (°F/°C)<br />
32° to 104°<br />
0° to 40°<br />
<strong>Subsea</strong> unit (°F/°C)<br />
32° to 104°<br />
0° to 40°<br />
Shock<br />
NES 1004 ISS 2 DS 20 + Defense - Standard<br />
07-55-test. A3 up to drop test<br />
Vibration<br />
<strong>Subsea</strong> equipment design<br />
NES 1004 ISS 2 DS 25<br />
5 to 150 Hz at 2-g for 6 hours<br />
Design life 25 years<br />
Intervention ROV deployment and intervention<br />
SCM size (in./mm)<br />
33 × 33 × 30 high<br />
(excluding mounting base)<br />
850 × 850 × 750 high<br />
SCM weight<br />
In air (lb/kg)<br />
1,764<br />
800<br />
In water (approximate) (lb/kg)<br />
1,323<br />
600<br />
SCM housing Pressure-compensated, dielectric-fluid filled<br />
Mounting<br />
System pressures and fluid<br />
<strong>Subsea</strong> tree or manifold structure<br />
(ROV to AP1 17H or diver)<br />
High pressure (psi/bar)<br />
14,997 MWP<br />
1,034 MWP<br />
Low pressure (psi/bar)<br />
3,002 MWP<br />
207 MWP<br />
<strong>Control</strong> fluid (standard)<br />
Water-based biodegradable, open-loop<br />
or petroleum-based, synthetic-mineral oil<br />
<strong>Control</strong> fluid cleanliness NAS 1638 Class 6<br />
Supply filtration<br />
Electrical<br />
Integral single B3 - 200 rating elements (3-micron)<br />
Power supply 230 or 480 Volts, 60 Hz single-phase supply<br />
Communications Fiber or twisted pair<br />
LonWorks and ModBus are trademarks of their respective owners.<br />
<strong>Weatherford</strong> <strong>International</strong> Ltd.<br />
515 Post Oak Blvd., Suite 600<br />
Houston, Texas 77027 USA<br />
Tel: 713-693-4000<br />
weatherford.com<br />
(4)<br />
Production Optimization<br />
<strong>Weatherford</strong> products and services are subject to the Company’s standard terms and conditions, available<br />
on request or at weatherford.com. For more information contact an authorized <strong>Weatherford</strong> representative.<br />
Unless noted otherwise, trademarks and service marks herein are the property of <strong>Weatherford</strong>. Specifications<br />
are subject to change without notice. <strong>Weatherford</strong> sells its products and services in accordance with the<br />
terms and conditions set forth in the applicable contract between <strong>Weatherford</strong> and the client.<br />
© 2008 <strong>Weatherford</strong>. All rights reserved. 5347.00
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