Chevron and Shell halt production at nine Gulf platforms as Isaias approaches

Precautionary closures are adding a domestic supply constraint to a market already factoring in heavy Middle East risk, which provides support for US crude benchmarks while the storm's trajectory remains unclear. The length of the outage is the critical factor: short closures are typically reversed quickly, but harm to rigs or pipelines could prolong losses and tighten the supply of sour crude from the Gulf. Market participants will monitor whether other producers follow suit and whether the storm endangers onshore refining and loading terminals, which would broaden the effect on fuel prices and product margins. Natural gas markets may also respond if associated gas production is reduced.

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Yesterday:

• Add a new risk to keep oil near $100: Gulf hurricane joins Houthi strikes and Iran tensions

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With the Gulf of Mexico now emerging as a supply concern alongside the Middle East, oil traders now have both a storm and a conflict to monitor.

Summary:

• Chevron has started shutting down production at four of its operated US Gulf sites ahead of Tropical Storm Isaias
• Output at Chevron's other five Gulf facilities is running normally, and some extra workers are being moved ashore
• Shell is removing all personnel and halting production at its Mars, Olympus, Ursa, Vito and Appomattox assets
• Shell has already relocated non-essential staff from its Stones asset
• Both companies stated they are closely watching the storm's forecasted route; Chevron is applying storm procedures at onshore locations

Chevron and Shell have initiated the process of shutting down oil and gas production at offshore sites in the US Gulf of Mexico as Tropical Storm Isaias nears, the companies confirmed, taking nine facilities offline as a precautionary measure.

Chevron announced it had begun shut-in procedures at four of its operated sites in the region, which the US government calls the Gulf of America, and was relocating some extra personnel to land. Output at its other five Gulf facilities was continuing at standard levels. At onshore sites, the company said it was following established storm protocols and closely tracking the storm's projected course.

Shell took more extensive measures at several of its major deepwater sites. The company said it was evacuating all workers and ceasing production at its Mars, Olympus, Ursa, Vito and Appomattox assets. It had already moved non-essential personnel from its Stones asset and said it would keep monitoring the storm for possible effects on its assets and operations.

Neither company provided figures on how much production had been affected. Such shut-ins are standard procedure when tropical storms threaten offshore platforms, enabling operators to secure wells and evacuate crews before conditions worsen. Output usually resumes after a storm passes and facilities are inspected, although the timing depends on the storm's path and whether any damage occurs.

The disruption arrives at a delicate moment for oil markets. Crude prices are already high due to supply risks in the Middle East, where attacks on tankers have increased, and any prolonged reduction in US offshore output would add to supply pressures.

The next developments hinge on Isaias itself. The storm's intensity and route will determine whether more operators follow Chevron and Shell in cutting output, how long the closures last, and whether onshore energy infrastructure along the Gulf Coast is also threatened.