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A Cost Effective Means to Transmit Real-Time and Archived Well Data. By: Abdullah Alkhalifah, P&CSD/PCD/PASU. 24-25 November 2008. Outline. Overview of SCADA Technology SCADA Evolution in Oil & Gas Operations Operational Requirement and system Architecture - PowerPoint PPT Presentation
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A Cost Effective Means to Transmit Real-Time A Cost Effective Means to Transmit Real-Time
and Archived Well Dataand Archived Well Data
By: Abdullah Alkhalifah, P&CSD/PCD/PASUBy: Abdullah Alkhalifah, P&CSD/PCD/PASU
24-25 November 2008 24-25 November 2008
OutlineOutline
Overview of SCADA TechnologyOverview of SCADA TechnologySCADA Evolution in Oil & Gas Operations SCADA Evolution in Oil & Gas Operations Operational Requirement and system Architecture Operational Requirement and system Architecture Data Acquisition over Low Speed NetworksData Acquisition over Low Speed NetworksProposed MethodProposed MethodChallenges and Opportunities Challenges and Opportunities ConclusionConclusion
Overview of SCADA TechnologyOverview of SCADA Technology
ADI20 AI ADI20 AI
SCADA Communication Network
RTU
RTDBMS
Comm Proc
HMI
data-gathering oriented.
Uses Shared Data Network/open protocols
Hardened Environmental Spec.
Number of IO’s 50K/Server
Server Redundancy
SCADA Vs DCS … a common questionSCADA Vs DCS … a common question
Alarm Handling and Acknowledgment in Server
Overview of SCADA TechnologyOverview of SCADA Technology
DCS Controller
DCS is process oriented
DCS use proprietary network/Protocol.
DCS Controller Environmental Spec.
Controller Redundancy
Number of IO’s Less than 5K /ctrl
SCADA Vs DCS … a common questionSCADA Vs DCS … a common questionAlarm Handling and Acknowledgment in Controller
SCADA Evolution in Oil & Gas Operations SCADA Evolution in Oil & Gas Operations
60’s 60’s and earlierand earlier Simple Press & Temp Simple Press & Temp
Gauges on the wellhead.Gauges on the wellhead. In Plant Well Testing In Plant Well Testing
FacilitiesFacilities Local Logging on well Local Logging on well
data.data. 80’s 80’s
Remote Testing Facilities.Remote Testing Facilities. Automated Logging of Automated Logging of
well data. well data. 2000+ 2000+
Specialized Inelegant Specialized Inelegant Subsystem P/T/Q Subsystem P/T/Q readings and Data readings and Data logging. logging.
Data Scan on High speed LinksData Scan on High speed Links
SCADA Communication Network F.O
IP Camera
PDHM MPFM ESP ADI20 AI
High Speed, High BandwidthHigh Speed, High Bandwidth Segregation and SecuritySegregation and Security Data Storage and retrieval on comm failure. Data Storage and retrieval on comm failure. Device capabilityDevice capability File FormatFile Format
Log File
Number of MODBUS slave can be accessedNumber of MODBUS slave can be accessed
File Format
File SizeMB
ScanFreq.(sec)
Percentage of channel utilization dedicated to real-time communications
20% 35% 50% 65% 80%
XML 6.18
1 3 2 2 1 0
5 17 14 11 7 4
10 35 28 22 15 8
CVS 3.5
1 6 5 3 2 1
5 31 25 19 13 7
10 62 51 39 27 15
Binary 0.99
1 22 18 13 9 5
5 110 90 69 48 27
10 221 180 138 97 55
Short Binary 0.33
1 66 54 41 29 16
5 332 270 208 145 83
10 665 540 416 291 166
Data Scan on low speed LinksData Scan on low speed Links
ADI20 AI
PDHM
MPFM
ESP
SCADA Communication NetworkSerial, UHF Radio
6.18
3.5
0.99
0.338
0 2 4 6 8
XML
CSV
Binary
Short Binary
File
For
mat
File Size MB
Time to upload PDHM Archived data saved using different file format on 9600 serial line
216
122
35
12
0 50 100 150 200 250
XML
CSV
Binary
Short Binary
File
For
mat
Time(min)
No of Slaves that can be scanned based on scan freq. at different line speed
fixed time delay-125 Reg/slave unit
1
2
4
7
7
10
18
33
78
95
106
110
0 20 40 60 80 100 120
9600
19200
38400
57600
Buad
Rat
e
No Slaves
60
5
1
Data Scan on low speed LinksData Scan on low speed Links
ADI20 AI
PDHM
MPFM
ESP
SCADA Communication NetworkSerial, UHF Radio
HOSTMODBUS
SlaveHost “write” to specificregisters) telling the PDHM which data “channel” the host wants to read and thetimestamp where the host wants data to begin
channel
timestamp where data to begin
READY
The Host begin polling the “data ready” register – looking for avalue of “ready”
1
2
3
1000 register buffer
4
When Host see a “ready register”, it will begin reading the 1000 register buffer.
6
Repeat for next 1000 values87 times to ready 24hrs@1sec scan data
PDHM Moves the requested data to the buffer
PDHM Sets to READY when Data transfer is completed
When finished, Write ZERO to the ready Register5
Challenges and OpportunitiesChallenges and Opportunities
Current RealityCurrent Reality Functional Specification Document for each project.Functional Specification Document for each project. Different approach for the same requirement.Different approach for the same requirement. Communication Protocol features.Communication Protocol features. Tele-Control Communication Network by IT.Tele-Control Communication Network by IT.
Multiple services on the same network.Multiple services on the same network. Impact on real time data.Impact on real time data. Segregation of Process Data/IT servicesSegregation of Process Data/IT services
I-Field requirements.I-Field requirements. 1 sec Data Update Time, No data lost, Data storage at field device.1 sec Data Update Time, No data lost, Data storage at field device. Several Specialized Devices Several Specialized Devices Scan rate for each application.Scan rate for each application.
Saudi Aramco InitiativesSaudi Aramco Initiatives
StandardizationStandardization Standard Functional Specifications Standard Functional Specifications
Document.Document. Identify specific requirement for Identify specific requirement for
each application.each application. Provide Standard Implementation Provide Standard Implementation
methodology.methodology. New Engineering StandardNew Engineering Standard Standard Communication Protocol.Standard Communication Protocol. SCADA Communication Architecture SCADA Communication Architecture
Best practices.Best practices. International Initiatives such as International Initiatives such as
Intelligent Intelligent Well Instrumentation Well Instrumentation Standardization (IWIS).Standardization (IWIS).
SummarySummary
SCADASCADA Applications are Evolving. Applications are Evolving.
Demand for more Reliable at High scan rate DATA is increasing.Demand for more Reliable at High scan rate DATA is increasing.
Communication Infrastructure Plays Major role on the over all SCADA Communication Infrastructure Plays Major role on the over all SCADA
Performance. Performance.
User looks for Fully Integrated solution (SCADA+RTU).User looks for Fully Integrated solution (SCADA+RTU).
User Support Open Industry Standard communication Protocols.User Support Open Industry Standard communication Protocols.
Standardize Functions Implementation methodology.Standardize Functions Implementation methodology.
Thank You!Thank You!