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!