Proved advantages of continuous circulation are the improvements on hole cleaning and solids transport. Maintaining constant bottomhole pressure, stuck pipe incidents and ballooning effects are reduced and formation with narrow margin between pore and fracture pressure are drillable.

Focus of the study is the time evaluation and comparison between offshore wells drilled with standard methods and applying continuous circulation technique, to highlight the Non-Productive Time (NPT) reduction.

Starting point are data of NPT and total duration for offshore activities related to intermediate and production phases, performed between 2018 and 2022. The Integrated Drilling Data Discovery (ID3) system is the software used for retrieving the data.

The classes of NPT selected for the analysis are related to the effect of the usage of continuous circulation devices on wellbore conditions and on geological problems, such as fluid influx, sticking, circulation losses.

The additional benefits highlighted by the study are that the wide application of continuous circulation on offshore operations leads to improve safety and wellbore quality, whilst decreases the NPT and improves the results in term of Time and Cost saving.

The considered amount of data regarding several well configurations, from different geographical areas, targeting different geological environments, provides a reliable outcome that suggests investigating potential further applications.

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