16th September 2026
The global oil market has entered a potentially dangerous phase.
The immediate problem is the shutdown of Saudi Arabia's East-West pipeline, a strategically important route designed to allow Saudi crude to reach the Red Sea without passing through the Strait of Hormuz.
But the bigger issue may be what happens to the world's remaining oil inventories if the disruption continues.
Oil markets can absorb a temporary supply shock when there are sufficient barrels sitting in storage. They become considerably more vulnerable when those inventories are being used to compensate for an ongoing loss of production or transportation capacity.
That is why the coming days could be more important for the oil market than the initial pipeline outage itself.
The Saudi pipeline is more than just another oil route
Saudi Arabia's East-West pipeline runs roughly 1,200 kilometres across the kingdom, connecting its oil-producing region in the east with the Red Sea port of Yanbu.
Its design capacity is around 7 million barrels per day, although actual flows have varied considerably. Recent reporting suggests that around 4 million barrels per day of potential export capacity is now at risk because of the shutdown.
Under normal circumstances, Saudi Arabia can use the pipeline to bypass the Strait of Hormuz.
That option has become particularly valuable because oil flows through Hormuz have already been severely disrupted.
The pipeline therefore represents something more important than its headline capacity: it is an alternative route when the conventional Gulf export route is unavailable.
Its closure removes that safety valve at precisely the moment when the market needs one.
The five-to-seven-day problem
Perhaps the most important number for the oil market now is not 7 million barrels per day.
It is five to seven days.
Reports indicate that Saudi Arabia has approximately five to seven days of export-ready oil at Yanbu, with additional stocks held at Egyptian facilities that could provide some further flexibility.
Those stocks are effectively acting as a bridge.
Saudi Arabia can continue supplying some customers despite the pipeline being offline because oil is already in storage.
But storage is not production.
Every barrel taken from inventory reduces the cushion available for tomorrow.
This creates a race between inventory depletion and pipeline repair.
If the pipeline is repaired quickly, the inventory drawdown may remain manageable.
If repairs take several weeks, however, the market faces a very different situation.
Why inventories could become the real story
The oil market has already been using inventories to absorb supply disruptions.
CNBC reports that global oil inventories have fallen by approximately 1 billion barrels, according to Paul Gooden of Ninety One, although Gooden estimated that there may still be another roughly 1 billion barrels before inventories reach extremely low levels.
That distinction is crucial.
The world is not necessarily running out of oil.
It is running out of surplus inventory that can be used to smooth disruptions.
Think of global oil stocks as a financial emergency fund.
If the market normally consumes 100 barrels a day but only 98 are being produced, inventories can supply the missing two barrels.
That can continue for a while.
But if the deficit persists, the emergency fund gets smaller.
Eventually the market has to encourage consumers to use less oil, persuade producers to produce more, or compete more aggressively for the barrels that remain.
Price is the mechanism that does much of that work.
The dangerous feedback loop
The most concerning scenario is therefore not necessarily a sudden disappearance of Saudi oil.
It is a feedback loop.
The pipeline shutdown reduces Saudi Arabia's ability to export through the Red Sea.
More Saudi crude may need to move through the Strait of Hormuz.
But Hormuz is already operating under severe disruption.
That means Saudi Arabia may have less ability to compensate for the pipeline outage.
Inventories are then used to maintain exports.
Those inventories fall.
Traders begin to worry about what happens when the stocks are exhausted.
Oil prices rise.
Higher prices encourage producers and consumers to respond, but those responses take time.
Meanwhile, the market becomes increasingly sensitive to every new attack, tanker movement, production announcement or repair update.
This is how a temporary infrastructure problem can become a much larger price event.
What could happen to the oil price?
Brent crude was around $107-$109 a barrel in the latest reporting, although prices have been highly volatile. Reuters reported Brent at $107.82 on September 16 after an unexpected rise in US crude inventories temporarily eased some of the pressure.
The inventory increase in the United States is important because it demonstrates that the oil market is not moving in only one direction.
There are still bearish forces.
But the Saudi pipeline outage creates a powerful upside risk.
Scenario one: the pipeline is repaired quickly
If Saudi Arabia restores the pipeline within days, the market could see a significant reduction in the immediate risk premium.
In that situation, some of the oil currently being drawn from inventories could be replaced.
Brent could therefore retreat from its current elevated levels, particularly if flows through Hormuz and the Red Sea also begin to normalise.
This is the scenario in which the present price spike proves largely temporary.
Scenario two: the outage lasts several weeks
This is considerably more problematic.
If the pipeline remains unavailable for several weeks, Saudi Arabia would have to rely increasingly on alternative export routes and stored crude.
The five-to-seven-day Yanbu buffer would no longer be sufficient on its own.
Additional storage, alternative shipping arrangements and other Saudi export mechanisms would become increasingly important.
At that point, the market would probably place a much greater premium on every available barrel.
The key question would shift from:
"When will the pipeline restart?"
to:
"How much oil is actually available to replace the missing Saudi flows?"
That is a much more bullish question for crude prices.
Scenario three: infrastructure and shipping disruptions spread
The most extreme scenario would involve the pipeline outage being followed by further disruption to Saudi terminals, Red Sea shipping, Hormuz traffic or other major producing infrastructure.
That could transform the situation from a transportation problem into a genuine global supply crisis.
At that point, strategic reserves and commercial inventories would become increasingly important.
The longer those reserves were used, the greater the possibility of an increasingly sharp price response.
This is also the scenario in which predictions become particularly unreliable. A single diplomatic agreement, ceasefire, pipeline repair or reopening of a shipping route could dramatically alter the market.
Why $100 oil may no longer be the ceiling traders are watching
There has already been a major psychological shift in the oil market.
Brent has moved above $100 a barrel, and recent reporting puts it around $108.
The important question is therefore no longer whether oil can trade above $100.
It already has.
The question is whether the market can remain above that level if the Saudi pipeline remains offline.
Some analysts have suggested that oil could move substantially higher if inventories continue to fall and the supply disruptions persist. The range of potential outcomes is exceptionally wide because it depends on the duration of the pipeline outage and the wider Middle East supply situation.
Rather than focusing on one precise price target, investors should probably be watching the direction of inventories and physical oil availability.
Those may provide a better indication of where the market is heading.
The hidden danger: diesel
There is another reason this matters.
The consequences of a prolonged oil shortage would not necessarily appear first in petrol prices.
Diesel and other refined products could become particularly important.
Diesel is essential for road transport, agriculture, construction, shipping and industry.
If refiners struggle to obtain crude or if refined-product inventories become tight, diesel prices can rise rapidly.
That can then feed into the cost of transporting goods.
The result can be a second-round inflationary effect across the wider economy.
This matters particularly at a time when UK inflation has already risen to 3.1%, according to the latest ONS figures.
A prolonged oil shock could therefore complicate the inflation picture further.
The buffer-stock question
The most important issue for the oil market may ultimately be the world's remaining buffer stocks.
There are several different forms of buffer:
Commercial crude inventories
Refined-product inventories
Oil held on tankers
Saudi and other producer-country storage
Government strategic petroleum reserves
Spare production capacity
These buffers are not interchangeable.
A barrel sitting in a strategic reserve is not necessarily equivalent to a barrel already positioned at a refinery.
Likewise, oil that technically exists but cannot safely be transported may not provide much practical relief to the market.
That is why the physical location of inventories matters almost as much as their headline size.
The next two weeks could be crucial
The oil market is now effectively watching two clocks.
The first is the Saudi repair clock.
How quickly can the East-West pipeline be returned to service?
The second is the inventory clock.
How quickly are available stocks being consumed to compensate for disrupted flows?
If the repair clock beats the inventory clock, the crisis could begin to unwind.
If the inventory clock runs faster, the market could become progressively tighter.
And if the pipeline remains shut while other Middle Eastern export routes remain constrained, the two clocks could move in the wrong direction simultaneously.
Central expectation
The most reasonable expectation is not necessarily that oil prices will rise indefinitely.
Rather, the Saudi pipeline shutdown creates a strongly asymmetric short-term risk: there appears to be considerably more scope for prices to rise if the outage persists than there is for a rapid return to much lower prices while the physical supply situation remains uncertain.
The market has already demonstrated that it is willing to trade above $100 a barrel.
The next stage depends on whether Saudi Arabia can restore its alternative export route before its readily accessible inventories are significantly depleted.
If it cannot, the oil market could move from worrying about a temporary disruption to pricing a genuine shortage.
That distinction could be enormous.
The oil market's new equation
For years, one of the assumptions underpinning the oil market was that Saudi Arabia could provide additional barrels and redirect exports when necessary.
The East-West pipeline was an important part of that flexibility.
Now that route is unavailable.
At the same time, global inventories have already been drawn down, according to recent industry estimates, while oil flows through Hormuz and the Red Sea remain heavily disrupted.
That leaves the market with less room for error.
The immediate question is therefore not simply "How much oil has Saudi Arabia lost?"
It is:
"How many barrels of inventory will the world have to use before the missing Saudi barrels can be replaced?"
If the answer is only a few million barrels, the shock may prove manageable.
If the answer becomes tens or hundreds of millions of barrels over several weeks, the consequences could be much more serious.
And if inventories continue falling while new supply disruptions occur, the market could discover that its supposedly comfortable oil buffer was much smaller than it appeared.
For oil consumers, that is the risk worth watching.