The Shell-operated Shearwater Platform has been shut-in since late March after pressure changes were detected in one of its wells. It now appears that an essential procedure to restore production to the platform could take several weeks. Earlier this month engineers removed pressure from the faulty well and are now using a drilling rig to investigate potential equipment problems. Shell is consulting with the U.K. Health & Safety Executive during the repair period. The company has not given a time when the platform will return to production. Shearwater has a maximum output of 370 million standard cubic feet of gas and 80,000 barrels of oil a day.