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Subsea pipeline transportation is a subject of hydrates/ice associated problem, risk of exposure of hydrates-related issues is significantly increased in extremely cold arctic condition. In case of emergency situation or technology process failures could result to partial chock or complete hydrates blockage of long part of subsea transportation system. In such case scenario costly and time-consuming replacement of affected pipeline section could not be carry out in safe manner because of presents of high pressure gas pockets distributed in hydrate plug. To reduce the overall risks, new technology and improved operational efficiency are required to meet the ambitions for hydrates plug removal. Coiled Tubing conveyed method is proposed as a light weight and efficient in both mobilization and operations point of view that enables operations to be performed more quickly and put pipeline on stream faster. Coiled Tubing equipment could be installed on wide range of types of marine vessels that helps to perform the job in a more cost and time effective way. This paper review the engineering and operational challenges related to utilizing Coiled Tubing in offshore pipeline intervention and the solutions required overcoming these issues.

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