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Abstract
The presentation relates to the computer based telemetry and telecontrol system being engineered by RCPO for application in oil and gas extraction in Bombay offshore oil fields of ONGC. The system consists of a number of complexes, each comprising a central gathering platform having a PDP-11 computer based telemetry master with remote terminal units (RTUs) in outlying unmanned platforms around the central platform. The RTUs are solar powered and are linked to the master via FDM/FM/UHF radio links. Some RTUs are linked directly by a 4 wire communication cable. The central locations comprising the computer are called nodes.
Primary function of each node is to have a totally independent telesupervisory and control system gathering data from RTUs from remote well platforms and effecting control over some important functions.
Type of parameters monitored/controlled through RTU are (a) Analogue (Pressure, Temperature, Flow, Level), (b) Status (High/low Pressure, Temperature, Level), (c) Integrator.
Dynamic colour graphic pictures of processes are displayed on a VDU monitor for easy operator interaction. Each node is capable of monitoring/controlling approximately 8000 points and displaying 350 pictures.
For the purpose of data archieving and management information service at ONGC Headquarters at Bandra, all nodes are being interlinked via 2 GHz/satellite digital communication circuits providing a computer network with resource sharing facilities.