Isolation of North Sea Pipeline Successfully Carried Out By Resident ROV and Remote Operations from Shore

Abstract

Abstract Pipeline isolation tools have long been used in decommissioning activities where continued production in connected pipeline sections is required. To reliably execute an isolation program, robust communication systems are required to load the isolation tool, track, activate and deactivate it, and monitor the tool during the isolation process. Historically, that has meant hard wiring or acoustically linking to the offshore platform or vessel. Typical subsea pipeline isolation projects are performed and supported by an ROV or diving vessel; however, advances in communication technology have changed that paradigm. Robust LTE and VSAT connectivity enable robust, dependable communications that support remote operations. Today, it is possible to execute the same types of pipeline isolation programs from globally located, onshore remote operations centers. Combining advanced pipeline isolation technologies with remotely operated resident ROV systems can transform operations by eliminating the need for costly vessel support and reduce the number of people required offshore. A recent pipeline isolation program used for the first time on Equinor's Veslefrikk Field in the Norwegian North Sea employed leading isolation technology and a resident, battery-powered, electric work-class ROV system remotely operated from shore, demonstrating that there is now a viable option to using an ROV or diving vessel for these types of subsea operations. This approach allowed key personnel to work as an interconnected team from an onshore base where they collaborated, controlled, and watched live operations rather than mobilizing offshore, enabling cost savings, reducing HSE risk, and increasing collaboration. By using the onshore remote operations center, the project team was able to ensure a successful campaign. The project was completed as planned, demonstrating not only the feasibility but the value and repeatability of this approach to pipeline isolation.