This paper describes the objectives, equipment and functions of the Supervisory Control and Data Acquisition (SCADA) system installed by Mobil Oil Indonesia (MOI) during the first half of 1983.
The SCADA system provides operations, management, and engineering personnel with various applications of automatic production control such as production reports, field and cluster status, and flow calculations. production reports, field and cluster status, and flow calculations. This paper concludes with a discussion of the particular benefits gained by MOI in the Arun Field as well as the features of the SCADA system which make it a potential model for similar systems throughout the petroleum industry.
The Arun Gas Field has grown from one cluster of nine wells producing approximately 600 MMSCFD of wet gas in 1977 to four clusters of 29 wells producing 1900 MMSCFD of wet gas in 1983. The ever increasing complexity producing 1900 MMSCFD of wet gas in 1983. The ever increasing complexity of reporting, safety, and maintenance requirements justified the installation of a Supervisory Control and Data Acquisition (SCADA) system.
The SCADA system configuration shown in Figure 1 consists of a central or host computer at the Point 'A' field operations office which communicates with remote micro computers or Remote Terminal Units (RTU) at each cluster control room, as well as Video Display Units (VDU) in Medan and Jakarta. The SCADA system is distributed to accommodate the Arun Field geographical layout as shown in Figure 2.
The host computer collects data from the cluster remote computers, processes the data and alarms, performs calculations, prepares reports, processes the data and alarms, performs calculations, prepares reports, updates the operator VDUs, and retains the information in storage.
The RTUs perform site-specific data gathering, alarming, calculations, and display updates.
Each strategic location has its own color semi-graphic VDU and printer which are updated from the host computer.
The SCADA configuration at the Arun Field was designed to be reliable, flexible and expandable to meet present and future needs.
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