Subsea Monitoring and Control Module. Communications and power hub for subsea and downhole devices. Image courtesy of Bluewater

Transcription

1 Subsea Monitoring and Control Module Communications and power hub for subsea and downhole devices Image courtesy of Bluewater

2 Applications Subsea transmission control protocol/internet protocol (TCP/IP) network Downhole and subsea data processing and storage Information-deficient subsea wells or fields Extended-reach subsea tieback field development Benefits Simple, seamless integration of multiple-vendor downhole and seafloor monitoring and control devices Flexibility in the implementation of instrumentation Design that allows upgrades without production shut-in New level of seafloor and downhole surveillance Minimized surface monitoring equipment and software Features Remote monitoring, control, and diagnostics in real time Open architecture One-to-one communications tunneling Distributed temperature sensor (DTS) enabled Intelligent well interface standardization (IWIS) compliant Simultaneous support for multiple subsea communication protocols Capacity to integrate Schlumberger and third-party interface cards Scalable and configurable Network management features, including virtual local area networks (LANs), Class of Service (COS), IP routing, bandwidth management, storm protection, and serial encapsulation communication lines Self-diagnostics and internal measurements Retrievable with standard work-class remotely operated vehicle (ROV) and tooling Overview The Schlumberger Subsea Monitoring and Control (SMC) module enables the subsea Production Assurance* services surveillance, flow boosting, and flow assurance. It is a communications and power hub for subsea and downhole devices that allows surface equipment to communicate directly with subsea and downhole equipment. It also provides local communications links for internal interface cards and external I/O modules, including production sensors and sand detectors. The SMC module enables a LAN to be established to connect an operator to the reservoir and the extended wellbore system. The open (plug-and-play), flexible system is IWIS compliant, so instrumentation from Schlumberger and third parties can interact seamlessly. The SMC platform is designed by experts in reservoir evaluation, intelligent well completions, seabed monitoring SDH (foreground) and its receptacle (background). and controls, and subsea system interfaces. Integrated subsea surveillance enables key functions that drive subsea productivity. Single-well system components The SMC module consists of a single topside data hub (TDH) and a combination of one or more single or multiwell subsea data hubs (SDHs). The TDH provides the topside link from the network of subsea data hubs, through the topside umbilical termination assembly, to the master control station, historian, shore-side communications link, and other data access points. The SDH contains the processor, I/O components, optical or electrical modems, internal diagnostics, and expandable nonproprietary capacity for third-party devices. A single power supply supports all the electronics within the module.

3 SMC installation The SMC module can be installed on a subsea production tree, manifold, or subsea distribution unit, and it is powered by distributions from dedicated power lines or a production control system. Normally the SDH is function tested and deployed as part of the host structure. It can be retrieved and reinstalled after the structure is deployed without shutting in the well. The SDH can be mounted vertically or horizontally on the structure by an ROV using a flying lead orientation tool, and it can be locked or unlocked using a standard American Petroleum Institute (API) torque bucket. Independent surveillance system There are two major advantages of having a discrete SMC system for surveillance. First, operation of the production control system is kept separate from reservoir and production instrumentation connectivity. Second, as technology evolves, the SMC system can be upgraded without interrupting production. SDH mounted on subsea production tree. Subsea tree image courtesy of FMC Corporation Power, communication, and transmission rates The SMC module outputs electric or hydraulic power to operate downhole flow control valves, downhole reservoir instrumentation, subsea pumps, and other electrical and hydraulic devices. It is not intended for tree control. This versatile module provides support for multiple subsea communication protocols, including Ethernet/IP, Profibus DP, Modbus, Modbus TCP/IP, ProfiNet, DeviceNet, Remote I/O, ROV installing an SDH horizontally. InterBus, Foundation Fieldbus, CAN, DH+, AS-I, HART, Genius Bus, and ControlNet. Data are transmitted from the SMC module to surface over a high-speed optical network, an electrical network, or a local production control system. An increase in bandwidth over conventional systems permits real-time production monitoring and control data to pass at the optimal transmission rates required for analysis. The data are moved reliably, are referenced appro- 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-time monitoring and data delivery system. Platform historian InterACT system Satellite or existing network link Production master control station Topside data hub Proprietary production control system communications Dedicated high-bandwidth monitoring and control system communication Production subsea control module Subsea data hub Seabed and downhole sensors

4 This wellbore completion layout shows a multiphase flowmeter, pressure and temperature sensors, a DTS, and flow control valves. A possible horizontal mounting of the SMC platform on a subsea tree is also shown. Surface control subsurface safety valve Upper-zone electric flow control valve Lower-zone electric flow control valve Fiber-optic wet connect SMC platform Chemical injection Permanent monitoring and surveillance system Sensa DTS Lower completion priately, and can be validated. The SMC module is also fully compatible with fiber-optic monitoring sensors. The TDH can communicate with the SDH over dedicated fiber-optic or electrical lines or transparently by means of a serial link to the production control system. When there is a dedicated fiberoptic link, dual optical modems in the surface rack and subsea modules provide a redundant, dedicated, high-speed communication link. The fiber-optic modem is linked to Ethernet switches on the SDH and TDH systems to create a surface-subsea network. The bandwidth provided by the optical modems is self-adapting and permits transmission rates of 10 MB/s, 100 MB/s, or whatever speed the infrastructure can support. If the production control system provides a pass-through communication link, the SMC commands will be issued from the TDH encapsulated in a TCP/IP packet, passed through the production control system, and extracted by the SDH. This pass-through, or tunneled, communications link allows the TDH to communicate directly with the SDHs so that the systems can be tested independently and the number of system interfaces and integration requirements can be reduced. An SDH can communicate with the production tree control module over a serial link at baud rates to 115 kb/s. Self-diagnostics and internal measurements The SDH has diagnostic sensors that aid in fault finding and prediction for the subsea electronics equipment. Alarms are generated on the TDH if a fault or error condition is detected. The diagnostic points monitored with SDH accelerometer, pressure, and temperature sensors are internal temperatures internal pressure input power voltage and current vibration along x-, y-, and z-axes internal-electronics-supplied power voltage and current. Multiple-well option A single SDH can be mounted centrally (e.g., on a manifold) to communicate with multiple wells. This can be accomplished with a single-well SDH or a multiwell SDH. A single-well SDH can communicate on a single serial connection to a remote I/O unit that contains the interface for the required connectors, power management, and I/O acquisition. DTS acquisitions are performed directly and sequentially by the SDH for as many as six wells. A single unit can contain multiple modules within an oil-filled enclosure. This option provides a larger footprint for the increased connector requirements. It can also include specialty third-party electronics, extended I/O, and multiple DTS modules for more than six wells. A multiwell SDH is configured according to the specific well distribution, instrumentation requirements, and control-system design. A remote I/O device can be used to enable multiwell data acquisition with a single SDH. A multiwell SDH can provide greater flexibility and allow data acquisition from more wells than a single SDH.

5 Schlumberger Interface Device Specifications Downhole and Separate Data Provided Total Baud Rate Input Average Peak Seabed Devices Surface PC Number of Voltage Power Power Required External Wires Downhole pressure No Diagnostics for pressure 1 TEC 12,000 38, V DC 2.5 W 3 W gauge and temperature gauges and interface cards Downhole Sensa* DTS No Temperature traces and 1 or 2 fibers Based on 24 V DC <55 W 55 W diagnostics acquisition and average rate ±12 V DC Downhole TRFC-E No Position, pressure, and 1 TEC 12,000 38, V DC 6 W W electric flow control temperature (monitoring) (operating) valve Downhole TRFC-HN No Supply pressures and na na na na na hydraulic flow control flow rate, return flow rate, valve solenoid position, and diagnostics Downhole FloWatcher* No Pressure and temperature, 1 TEC 12,000 38, V DC 2.5 W 3 W monitor flow rate, water holdup, and density PhaseWatcher* No Volume flow rates; line 4 12,000 38, V DC 30 W 40 W multiphase 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 DC Fiber-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, automatic 10 base T, backup 1-megabit/s serial 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 Peak Seabed Devices Surface PC Number of Voltage Power Power Required External Wires Downhole pressure No Downhole pressure and 1 TEC 9, V DC 24 W 24 W gauge temperature Point pressure and Yes Downhole pressure and 1 fiber Variable, 30 bytes/ 24 V DC 15 W 15 W temperature optical temperature and diagnostics acquisition, raw, sensor unaveraged Seabed flowmeter No Volume flow rates, 4 1,200 9, V DC or 25 W 35 W pressure and temperature, V AC and gas/oil ratio Chemical injection No Pressure, proximity switch 4 1, V DC 4 W 20 W throttle valve Nonintrusive sand No Sand rate (g/s) 4 1, V DC 0.5 W 0.5 W detector Erosion meter Yes Erosion 4 Variable 24 V DC 1 W 1 W Partial list only Cards and sensor power

6 Subsea Monitoring and Control Module Specifications Specifications Single Well Multiple Well Input power V AC, Hz V AC, Hz Min. power usage (W) 25 Case dependent Diameter (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]) [-5 50] [-5 50] Storage temperature range ( F [ C]) [-20 70] [-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-g n, 11-ms half sine 10-g n, 11-ms half sine Vibration rating Hz, 5-g n acceleration Hz, 5-g n 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. Recommended Equipment Required Baud Rate Q-Seabed seismic system Yes 40-component seismic data 4 fiber-independent power 1.9 MB/s per km Framo seabed multiphase Yes Pump intake and discharge, 4 9,600 kb/s per km booster pump pressure and temperature, choke position, and hydraulic functions Mark of WesternGeco 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