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The limitations to performing rigless interventions in small platforms and safety concerns of performing multiple heavy lifts to the platform have motivated different locations worldwide to find solutions for accomplishing their objectives by utilizing proven techniques. In Brunei, after more than 8 years of continuous coiled tubing (CT) catenary operations, comprehensive and detailed processes have been strongly established and have created a guide that can be used for implementing similar operations in other locations that do not have such experience.A methodology was implemented to find the bottlenecks in each process involved during the entire cycle of a CT intervention as well as the actions taken by an operator and a service company to eliminate them. Statistical comparisons were used to contrast what was done in the past with what has been implemented in recent years. Additionally, new vessel positioning systems, improved disconnect systems, and proven safety considerations were analyzed, and a streamlined process to operation design, execution, and evaluation (DEE) cycles was developed.As a result of the process improvement documentation has been elaborated which include the flexibility and limitations of the system to cover concerns that are usually present in every stage of the intervention. Checklists and local guidelines will aid workers from other locations to implement catenary operations by using a reference document to cover HSE requirements and well integrity issues including volatile operating conditions and to obtain the information necessary to deliver technically challenging operations.This work supplements the current literature that addresses the "what" of past case histories by providing guidelines for the "how" to achieve an implementation of successful operations while complying with global HSE and environmental regulations. A priority of this work was sharing of knowledge obtained while giving space for continuous improvement related to this type of operation in the future. |
