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This paper provides an overview of the aims, objectives and the main findings of the CO 2 QUEST FP7 collaborative project, funded by the European Commission designed to address the fundamentally important and urgent issues regarding the impact of the typical impurities in CO 2 streams captured from fossil fuel power plants and other CO 2 intensive industries on its safe and economic pipeline transportation and storage. The main features and results recorded from some of the unique test facilities constructed as part of the project are presented. These include an extensively instrumented realistic-scale test pipeline for conducting pipeline rupture and dispersion tests in China, an injection test facility in France to study the mobility of trace metallic elements contained in a CO 2 stream following injection near a shallow-water qualifier and fluid/rock interactions and well integrity experiments conducted using a fully instrumented deep-well CO 2 /impurities injection test facility in Israel. The above, along with the various unique mathematical models developed, provide the fundamentally important tools needed to define impurity tolerance levels, mixing protocols and control measures for pipeline networks and storage infrastructure, thus contributing to the development of relevant standards for the safe design and economic operation of CCS.Dedication: This paper is dedicated to the memory of our friend and colleague, Dr. Robert M. Woolley, who made a significant input to the CO 2 QUEST project and whose expertise, commitment and support inspired many of those around him.

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