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A Total Integrated Approach

A case study describing how total plant turbomachinery control was used to maximize production at the ConocoPhillips Bayu-Undan project.

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The Bayu-Undan platform is a unique world-scale offshore gas processing platform handling over 1.1 billion cubic feet per day of gas. The platform extracts over 115,000 barrels per day of combined condensate, propane, and butane and produces over 950 MMSFCD of dry natural gas.

The project was implemented in two phases. Phase 1, achieving production in early 2004, involved processing the wet gas to separate and store condensate, propane, and butane; and reinjecting dry gas back into the reservoir. Phase 2, realizing production in early 2006, involved exporting the gas via pipeline to a liquefied natural gas (LNG) facility near Darwin, Australia.

Process Overview

Gas from the wellheads is fed to the production separator where heavier hydrocarbons drop out as liquids. The glycol contactors remove water entrained in the gas stream. The gas is further processed by the cold process trains to remove condensate. The liquid from the production separator feeds the second stage separator, where light hydrocarbons flash out and feed the second stage of the flash gas compressor and the remaining liquid is further processed by the fractionators. Light gas from the fractionators is compressed by the flash gas compressors and sent back to the production separator. Gas from the recompressors is compressed for reinjection into the reservoir and/or export to the pipeline.