190820 – Harrier Development: Successful Implementation of the World’s First Offshore Multilateral Installation with Staged Acid Fracturing Performed on Both Laterals

Summary

This paper details the evolution of the Harrier field development plan (FDP) in the context of innovation within completion and stimulation treatment design which has successfully created value for this North Sea gas operator. The successful proposition of a revolutionary contraction of the FDP is discussed, with a unique design concept of a single well development terminating in a dual lateral with each leg targeting a separate reservoir in which fourteen acid stimulation stages per leg were planned to greatly enhance productivity. The paper provides an overview of the stimulation design, based on the reservoir challenges encountered and the progression of the completion design explored, into its final fit for purpose realization. Results in relation to achievement of well objectives, service delivery, change management during the execution phase and most significantly overall well performance are also provided.