Subsea Monitoring and Control Module - · PDF fileCommunications and power hub for subsea and downhole devices Subsea Monitoring and Control Module Image courtesy of Bluewater

Communications andpower hub for subseaand downhole devices

Subsea Monitoring and Control Module

Image courtesy of Bluewater

Applications■ Subsea transmission control

protocol/internet protocol(TCP/IP) network

■ Downhole and subsea data processing and storage

■ Information-deficient subseawells or fields

■ Extended-reach subsea tiebackfield development

Benefits■ Simple, seamless integration

of multiple-vendor downholeand seafloor monitoring andcontrol devices

■ Flexibility in the implementa-tion of instrumentation

■ Design that allows upgradeswithout production shut-in

■ New level of seafloor anddownhole surveillance

■ Minimized surface monitoringequipment and software

Features■ Remote monitoring, control,

and diagnostics in real time

■ Open architecture

■ One-to-one communicationstunneling

■ Distributed temperature sensor(DTS) enabled

■ Intelligent well interface stan-dardization (IWIS) compliant

■ Simultaneous support for multiple subsea communicationprotocols

■ Capacity to integrateSchlumberger and third-partyinterface cards

■ Scalable and configurable

■ Network management features,including virtual local area net-works (LANs), Class of Service(COS), IP routing, bandwidthmanagement, storm protection,and serial encapsulation com-munication lines

■ Self-diagnostics and internalmeasurements

■ Retrievable with standardwork-class remotely operatedvehicle (ROV) and tooling

OverviewThe Schlumberger Subsea Monitoringand Control (SMC) module enables thesubsea Production Assurance* services—surveillance, flow boosting, and flowassurance. It is a communications andpower hub for subsea and downholedevices that allows surface equipmentto communicate directly with subseaand downhole equipment. It also pro-vides local communications links forinternal interface cards and external I/Omodules, including production sensorsand sand detectors. The SMC moduleenables a LAN to be established to con-nect an operator to the reservoir andthe extended wellbore system.

The open (plug-and-play), flexible system is IWIS compliant, so instrumen-tation from Schlumberger and third par-ties can interact seamlessly.

The SMC platform is designed byexperts in reservoir evaluation, intelligentwell completions, seabed monitoring

and controls, and subsea system inter-faces. Integrated subsea surveillanceenables key functions that drive subseaproductivity.

Single-well system componentsThe SMC module consists of a singletopside data hub (TDH) and a combina-tion of one or more single or multiwellsubsea data hubs (SDHs).

The TDH provides the topside linkfrom the network of subsea data hubs,through the topside umbilical terminationassembly, to the master control station,historian, shore-side communicationslink, and other data access points.

The SDH contains the processor, I/O components, optical or electricalmodems, internal diagnostics, andexpandable nonproprietary capacity for third-party devices. A single powersupply supports all the electronicswithin the module.

SDH (foreground) and its receptacle (background).

SMC installationThe SMC module can be installed on asubsea production tree, manifold, or sub-sea distribution unit, and it is poweredby distributions from dedicated powerlines or a production control system.

Normally the SDH is function testedand deployed as part of the host struc-ture. It can be retrieved and reinstalledafter the structure is deployed withoutshutting in the well. The SDH can bemounted vertically or horizontally onthe structure by an ROV using a flyinglead orientation tool, and it can belocked or unlocked using a standardAmerican Petroleum Institute (API)torque bucket.

Independent surveillance systemThere are two major advantages of having a discrete SMC system for sur-veillance. First, operation of the pro-duction control system is kept separatefrom reservoir and production instru-mentation connectivity. Second, astechnology evolves, the SMC systemcan be upgraded without interruptingproduction.

Power, communication, and transmission ratesThe SMC module outputs electric orhydraulic power to operate downholeflow control valves, downhole reservoirinstrumentation, subsea pumps, andother electrical and hydraulic devices.It is not intended for tree control.

This versatile module provides sup-port for multiple subsea communica-tion protocols, including Ethernet/IP,Profibus DP, Modbus,® Modbus TCP/IP,ProfiNet, DeviceNet, Remote I/O,

InterBus,® Foundation Fieldbus, CAN,DH+, AS-I, HART,® Genius® Bus, andControlNet®.

Data are transmitted from the SMCmodule to surface over a high-speedoptical network, an electrical network,or a local production control system.An increase in bandwidth over conven-tional systems permits real-time pro-duction monitoring and control data to pass at the optimal transmissionrates required for analysis. The data aremoved reliably, are referenced appro-

SDH mounted on subsea production tree. ROV installing an SDH horizontally.

Subsea tree image courtesy of FMC Corporation

Platformhistorian InterACT system

Proprietary production control system communications

Dedicated high-bandwidth monitoring and control system communication

Satelliteor existing

network link

Production master control station

Production subsea control module

Seabed and downholesensors

Topsidedata hub

Subseadata hub

A subsea system can be monitored and controlled from anywhere in the world through a communications link between the SMC module and the InterACT* real-timemonitoring and data delivery system.

priately, and can be validated. The SMCmodule is also fully compatible withfiber-optic monitoring sensors.

The TDH can communicate with theSDH over dedicated fiber-optic or elec-trical lines or transparently by meansof a serial link to the production controlsystem. When there is a dedicated fiber-optic link, dual optical modems in thesurface rack and subsea modules pro-vide a redundant, dedicated, high-speedcommunication link. The fiber-opticmodem is linked to Ethernet switcheson the SDH and TDH systems to createa surface-subsea network. The band-width provided by the optical modemsis self-adapting and permits transmis-sion rates of 10 MB/s, 100 MB/s, orwhatever speed the infrastructure can support.

If the production control system pro-vides a pass-through communicationlink, the SMC commands will be issuedfrom the TDH encapsulated in a TCP/IPpacket, passed through the productioncontrol system, and extracted by theSDH. This pass-through, or tunneled,communications link allows the TDHto communicate directly with the SDHs so that the systems can be tested inde-pendently and the number of systeminterfaces and integration requirementscan be reduced. An SDH can communi-cate with the production tree controlmodule over a serial link at baud ratesto 115 kB/s.

Self-diagnostics and internal measurementsThe SDH has diagnostic sensors that aidin fault finding and prediction for thesubsea electronics equipment. Alarmsare generated on the TDH if a fault orerror condition is detected. The diag-nostic points monitored with SDHaccelerometer, pressure, and tempera-ture sensors are

■ internal temperatures

■ internal pressure

■ input power voltage and current

■ vibration along x-, y-, and z-axes

■ internal-electronics-supplied powervoltage and current.

Multiple-well optionA single SDH can be mounted cen-trally (e.g., on a manifold) to commu-nicate with multiple wells. This can beaccomplished with a single-well SDH or a multiwell SDH.

■ A single-well SDH can communicateon a single serial connection to aremote I/O unit that contains theinterface for the required connectors,power management, and I/O acquisi-tion. DTS acquisitions are performeddirectly and sequentially by the SDHfor as many as six wells.

■ A single unit can contain multiplemodules within an oil-filled enclosure.This option provides a larger footprintfor the increased connector require-ments. It can also include specialtythird-party electronics, extended I/O,and multiple DTS modules for morethan six wells.

A multiwell SDH is configuredaccording to the specific well distribu-tion, instrumentation requirements, and control-system design.

This wellbore completion layout shows a multiphaseflowmeter, pressure and temperature sensors, aDTS, and flow control valves. A possible horizontalmounting of the SMC platform on a subsea tree is also shown.

Chemical injection

Permanent monitoring andsurveillance system

Sensa DTS

A remote I/O device can be used to enable multi-well data acquisition with a single SDH.

A multiwell SDH can provide greater flexibilityand allow data acquisition from more wells than a single SDH.

Lower completion

Fiber-optic wet connect

Lower-zoneelectric flowcontrol valve

Upper-zoneelectric flowcontrol valve

Surface control subsurfacesafety valve

SMC platform

Schlumberger Interface Device Specifications

Downhole and Separate Data Provided Total Baud Rate Input Average PeakSeabed Devices Surface PC Number of Voltage Power Power

Required External Wires

Downhole pressure No Diagnostics for pressure 1 TEC† 12,000–38,400 24 V DC 2.5 W 3 Wgauge and temperature gauges

and interface cardsDownhole Sensa* DTS No Temperature traces and 1 or 2 fibers Based on 24 V DC <55 W 55 W

diagnostics acquisition andaverage rate ±12 V DC

Downhole TRFC-E No Position, pressure, and 1 TEC 12,000–38,400 24 V DC 6 W 150–300 W electric flow control temperature (monitoring) (operating)valveDownhole TRFC-HN No Supply pressures and na§ na§ na§ na§ na§

hydraulic flow control flow rate, return flow rate,valve‡ solenoid position, and

diagnosticsDownhole FloWatcher* No Pressure and temperature, 1 TEC 12,000–38,400 24 V DC 2.5 W 3 Wmonitor flow rate, water holdup,

and densityPhaseWatcher* No Volume flow rates; line 4 12,000–38,400 24 V DC 30 W 40 Wmultiphase flowmeter and standard-phase

fractions and mass flow rates for gas, oil, and water;pressure and temperature; and gas/oil ratio

Flowline Sensa DTS No Temperature traces and 1 or 2 fibers Based on 24 V DC <55 W 55 W(configuration dependent) diagnostics acquisition and

average rate ±12 V DCFiber-optic modem No Fiber-optic 2 single-mode Self-optimizing 5 V with 24-V 7 W 9 W

communications fibers per modem 100 base T, automatic10 base T, backup1-megabit/sserial backup

† Twisted encapsulated conductor‡ Controlled using SMC hydraulic module§ Not applicable

Third-Party Interface Device Specifications†

Downhole and Separate Data Provided Total Baud Rate Input Average PeakSeabed Devices Surface PC Number of Voltage‡ Power‡ Power‡

Required External Wires

Downhole pressure No Downhole pressure and 1 TEC 9,600 24 V DC 24 W 24 Wgauge temperaturePoint pressure and Yes Downhole pressure and 1 fiber Variable, 30 bytes/ 24 V DC 15 W 15 Wtemperature optical temperature and diagnostics acquisition, raw,sensor unaveragedSeabed flowmeter No Volume flow rates, 4 1,200–9,600 24 V DC or 25 W 35 W

pressure and temperature, 100–660 V ACand gas/oil ratio

Chemical injection No Pressure, proximity switch 4 1,200 24 V DC 4 W 20 Wthrottle valveNonintrusive sand No Sand rate (g/s) 4 1,200 24 V DC 0.5 W 0.5 WdetectorErosion meter Yes Erosion 4 Variable 24 V DC 1 W 1 W

† Partial list only‡ Cards and sensor power

04-IC-024 ©Schlumberger

October 2004 *Mark of Schlumberger

ControlNet® is a registered trademark of ControlNet, Incorporated.Framo® is a registered trademark of Frank Mohn AS.Genius® is a registered trademark of GE Fanuc Automation North America, Inc.HART® is a registered trademark of HART Communication Foundation.InterBus® is a registered trademark of Phoenix Contact GmbH & Co.Modbus® is a registered trademark of Gould Inc. Corp.

Produced by Marketing Communications, Houston

www.slb.com/oilfield

Subsea Monitoring and Control Module Specifications

Specifications Single Well Multiple Well

Input power† 110–264 V AC, 47–63 Hz 110–264 V AC, 47–63 HzMin. power usage (W) 25 Case dependentDiameter (in. [mm]) 10.5 [266.70] 26.5 [673.10] (approx)Length (ft [m]) 2 [0.61] 2.46 [0.75] (approx)Weight (lbm [kg]) 75 [34.0]‡ 700 [317.5]§ (approx)Operating temperature range (°F [°C]) 23–122 [-5–50] 23–122 [-5–50]Storage temperature range (°F [°C]) -4–158 [-20–70] -4–158 [-20–70] Pressure rating (psi [kPa]) 5,000 [34,475] 5,000 [34,475]Water depth (ft [m]) 10,000 [3,000] 10,000 [3,000]Shock rating 10-gn, 11-ms half sine 10-gn, 11-ms half sineVibration rating 25–150 Hz, 5-gn acceleration 25–150 Hz, 5-gn acceleration

† Other options available on request.‡ In seawater with flotation§ In seawater

External Seabed Equipment Requiring Dedicated Power Lines

Devices Additional Surface Data Provided Total Number of Wires Min. RecommendedEquipment Required Baud Rate

Q-Seabed† seismic system Yes 40-component seismic data 4 fiber-independent power 1.9 MB/s per kmFramo® seabed multiphase Yes Pump intake and discharge, 4 9,600 kB/s per kmbooster pump pressure and temperature,

choke position, and hydraulicfunctions

† Mark of WesternGeco