Single Trip Multifrac Operation with Sliding Sleeves on a Subsea Template in the North Sea

Abstract As global energy systems evolve, operators are increasingly compelled to extract value from complex, tight reservoirs, assets once considered uneconomical or too technically challenging to develop. The North Sea, with its mature infrastructure and evolving field redevelopment strategies, represents a frontier where such innovations can create outsized impact. This paper documents a successful collaboration to implement a single-trip multistage hydraulic fracturing system using multicycle sliding sleeves on a subsea template in the Gullfaks South field. It is the first time this technology has been applied in this specific configuration in the North Sea, and it offers a transformative approach to stimulating tight, compartmentalized formations like the Lunde reservoir. The goal is to share a proven methodology that allows operators to achieve: Enhanced recovery factors from tight formations previously deemed uneconomic Lower operational risk when compared to other hydraulic fracturing techniques where proppant under-displacement is required Operational scalability for future subsea developments with jack-up, semi-sub rigs, or floating rigs.