Download A Cost Effective Mean to Transmit Real

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
Data Acquisition over Low Speed Networks
Proposed Method
Challenges and Opportunities
Conclusion
Overview of SCADA Technology
Alarm Handling and
Acknowledgment in
Server
SCADA Vs DCS … a common question
data-gathering oriented.
Comm Proc
RTDBMS
HMI
Uses Shared Data
Network/open protocols
SCADA Communication Network
Hardened Environmental
Spec.
RTU
Server
Redundancy
20 AI
Number of IO’s
50K/Server
ADI
O/I ITLUM
O/I ITLUM
O/I ITLUM
O/I ITLUM
O/I ITLUM
Overview of SCADA Technology
SCADA Vs DCS … a common question
DCS is process oriented
Alarm Handling and
Acknowledgment in
Controller
DCS use proprietary
network/Protocol.
DCS Controller Environmental
Spec.
Controller Redundancy
Number of IO’s Less than 5K /ctrl
DCS Controller
SCADA Evolution in Oil & Gas Operations
 60’s and earlier



Simple Press & Temp
Gauges on the wellhead.
In Plant Well Testing
Facilities
Local Logging on well
data.
 80’s


Remote Testing Facilities.
Automated Logging of
well data.
 2000+

Specialized Inelegant
Subsystem P/T/Q
readings and Data
logging.
Data Scan on High speed Links





High Speed, High Bandwidth
Segregation and Security
Data Storage and retrieval on comm failure.
Device capability
File Format
SCADA Communication
Network F.O
PDHM
20 AI
Log File
ADI
O/I ITLUM
IP Camera
MPFM
ESP
Number of MODBUS slave can be accessed
File
Format
XML
CVS
Binary
Short Binary
File Size
MB
6.18
3.5
0.99
0.33
Scan
Freq.
(sec)
Percentage of channel utilization dedicated to real-time
communications
20%
35%
50%
65%
80%
1
3
2
2
1
0
5
17
14
11
7
4
10
35
28
22
15
8
1
6
5
3
2
1
5
31
25
19
13
7
10
62
51
39
27
15
1
22
18
13
9
5
5
110
90
69
48
27
10
221
180
138
97
55
1
66
54
41
29
16
5
332
270
208
145
83
10
665
540
416
291
166
Data Scan on low speed Links
No of
Slaves
that can
be scanned
based
on scan
usingfreq.
saved
Archived data
PDHM
to upload
Time
at different line speed
different file format on 9600 serial line
Short Binary
0.338
fixed time delay-125 Reg/slave unit
Short Binary
57600
File Format
38400
0.99
2
110
35
106
18
CSV
19200
33
Binary
4
File Format
Buad Rate
Binary7
12
3.5
CSV
122
10
XML
9600 XML7
1
0
78
0
0 20
2 40
100
50
60
4
150
80 6
Time(min)
File Size MB
20 AI
ADI
60
5
95
1
SCADA Communication Network
Serial, UHF Radio
216
6.18
200
250
100 8
120
No Slaves
PDHM
MPFM
ESP
O/I ITLUM
Data Scan on low speed Links
MODBUS
Slave
HOST
1
Host “write” to specific
registers) telling the PDHM
which data “channel” the host
wants to read and the
timestamp where the host wants
data to begin
channel
timestamp where data to begin
2
Repeat for next 1000 values
87 times to ready 24hrs@1sec scan data
3
6
The Host begin polling the “data
ready” register – looking for a
value of “ready”
When Host see a “ready
register”, it will begin reading the
1000 register buffer.
PDHM Moves the requested
data to the buffer
20 AI
ADI
1000 register buffer
4
PDHM Sets to READY
when Data transfer is
completed
SCADA Communication Network
Serial, UHF Radio
READY
PDHM
5
When finished, Write ZERO
to the ready Register
MPFM
ESP
O/I ITLUM
Challenges and Opportunities

Current Reality





Functional Specification Document for each project.
Different approach for the same requirement.
Communication Protocol features.
Tele-Control Communication Network by IT.
 Multiple services on the same network.
 Impact on real time data.
 Segregation of Process Data/IT services
I-Field requirements.
 1 sec Data Update Time, No data lost, Data storage at field device.
 Several Specialized Devices
 Scan rate for each application.
Saudi Aramco Initiatives

Standardization
 Standard Functional Specifications
Document.
 Identify specific requirement for
each application.
 Provide Standard Implementation
methodology.
 New Engineering Standard
 Standard Communication Protocol.
 SCADA Communication Architecture
Best practices.
 International Initiatives such as
Intelligent Well Instrumentation
Standardization (IWIS).
Summary
 SCADA Applications are Evolving.
 Demand for more Reliable at High scan rate DATA is increasing.
 Communication Infrastructure Plays Major role on the over all SCADA
Performance.
 User looks for Fully Integrated solution (SCADA+RTU).
 User Support Open Industry Standard communication Protocols.
 Standardize Functions Implementation methodology.
Thank You!