As in the world, the increase in the number of platform decommissioning projects in Brazil is directly influenced by the advanced age of some of the facilities, especially in the Campos Basin. Although the decommissioning phase is part of the life cycle of an oil development project and several similar projects have already been carried out in the Gulf of Mexico and the North Sea, the challenges in this sector are still enormous, especially in reducing operational risks, environmental impacts and financial costs. Over the last few years, the company has sought to reduce divers' exposure to risk, as well as reduce this dependence on human diving in its underwater activities and reducing critical resources that impact underwater connections. This article investigates the diverless trend in the global oil industry, demonstrating relevant aspects of this transition that involves replacing human diving in subsea operations with specific tools and ROV. In this sense, the operational and security aspects related to the theme will be explored. Using the descriptive methodology and considering the Marlim Gas Mesh Readjustment Project. The objective of this work is to present the diverless solution that is being implemented for readjustment of the Marlim Gas Mesh in Campos Basin in a PLEM called MIS-MRL-1. As brief history is that the Manifold that was installed in a Water Depth of about 200m and was initially designed to be operated by saturated divers.

Over the last few years, Petrobras has sought to reduce divers’ exposure to risk, as well as reduce this dependence on human diving in its underwater activities and reducing critical resources that impact underwater interconnections. A subsequent de-risking phase of the principal technological gaps and critical engineering activities were structured to support a robust solution to be installed and validated in a full-scale prototype tool. All feasibility studies indicated the need development of tools that can be less impacted by the relative movements between floating platforms and ROVs (Remotely Operated Vehicle) in shallow water operations, allowing bellmouth preparation operations, for example. This paper presents the challenges that Petrobras has been facing to perform the pull in and pull out of flexible pipes with ROV in scenarios made to operate with divers.