The Gorgon Project, located in Western Australia, is one of the world’s largest natural gas projects. The project is a joint venture of Chevron, ExxonMobil, Shell, Osaka Gas, Tokyo Gas and Chubu Electric Power.
The Gorgon field gas contains 14-16% of naturally occurring Carbon Dioxide (CO2) which must be separated out and safely disposed of before the purified methane can be liquefied. As an alternative to disposal via atmospheric venting, the Gorgon Joint Venture is investing approximately $2 billion in the design and construction of the world’s largest commercial-scale CO2 injection facility. This will reduce the project’s overall greenhouse gas emissions by approximately 40% or 3.6 million tonnes per year.
Reservoir CO2 will be extracted and compressed during gas processing and injected at a depth of about 2.5km, where it will remain permanently stored in an underground saline aquifer. Approximately 120 million tonnes of CO2 will be injected underground over the forty-year life of the Gorgon Project (almost six times more than any other project in the world).
Early detection of CO2 leakage is a vital component of the project and therefore the Gorgon Joint Venture decided to deploy Senscient ELDS sensors. These sensors can detect CO2 over distances of up to 120 metres enabling rapid detection over a wide area. It is the only field sensor technology that is CO2 specific, ensuring no false alarms or interference from other gases. With no consumable parts and a patented, automatic, self-testing facility called SimugasTM, the detectors also provide significant cost savings over conventional fixed point toxic gas detectors.
CO2 compressor module under construction at Gorgon LNG.