Visualization and control of the West Karoun Oil Fields' oil metering system in Iran

June 28, 2016 | Reliance SCADA

In 2015, Delta Gas Mobin Group implemented a system for the monitoring and control of the oil metering system at the West Karoun Oil Fields in Iran.

The metering system comprises three meter runs with turbine flow meters, including the meter runs' inlet and outlet. Each meter run has a capacity of 50 % for custody transfer metering.

Meter run = a piece of pipe that is equipped with all necessary instruments
         for custody transfer flow metering

Each meter run is equipped with the following elements:

  • Two motor-operated isolation valves
  • Turbine flow meter
  • Absolute or gauge pressure transmitter
  • Temperature transmitter
  • Local indicators for temperatures and pressures
  • Prover motor-operated isolation valve
  • Flow control valve
  • Strainer

To verify the accuracy of flow measurement (automatically/manually), a bidirectional pipe prover is used.

Control system

The elements of each meter run are wired to the flow computing, monitoring, and supervisory cabinet (control cabinet), which is installed in the control room. One server PC and two printers are located in the operator's room. The PC is equipped with Reliance's runtime software and is connected to the control cabinet through a redundant Ethernet link.

The software has different access levels, which protect the system against unwanted access. Required field and calculated signals are transferred to the distributed control system. The system is equipped with a Siemens SIMATIC S7-400H PLC to control the operation of the motor-operated isolation valves. Flow calculations are done by using four Flow-X flow computers. Up to four fiscal signals (those that have a direct effect on measurement, such as oil flow, pressure, temperature) are transferred to a flow computer, the other signals to the PLC. Subsequently, all signals are visualized by Reliance. The Reliance SCADA system communicates with the PLC and the flow computers via a redundant Modbus Ethernet link.

The Reliance SCADA system provides the following functionality:

  • Modification of operational parameters and settings, such as alarm and deviation limits, transmitter overrides
  • Graphical-oriented operator screens displaying important metering data–related information from the flow computers, flow meters, transmitters, and valves
  • Data transparency towards the operators
  • Operating feedback from the motor-operated isolation valves
  • Generating custody transfer reports and other reports (daily, monthly, and prover reports); they are stored on the hard disk and can be printed automatically
  • Archiving of reports, alarms/events, and trends
  • Secure environment by protecting the system from unauthorized access
  • Alarm management; alarms are derived from primary input signals as well as from calculated figures, they can be printed on the alarm printer, and are stored on the hard disk; in addition, alarm messages and their acknowledgements are reported
  • Real-time and historical trending for all major signals in the system
  • Monitoring of all important signals with high and low limits; generating an alarm if any of the signals is out of the normal range
  • Human–machine interface with which the operator can monitor, for example, all live values, calculated values, alarm/event messages, parameters, and settings in a number of graphical displays
  • Full proving control
  • Full sampling control

Examples of visualization windows

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Chemical plant, illustrative image

Delta Gas Mobin Group