Oil production was not affected by the virus which struck on 15 August, Saudi Aramco added.
Exxon is one-twentieth the size of Saudi Aramco, which is a Saudi oil company.
No corporate attacks so far appear to have been as big as the one on Saudi Aramco.
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Mexico's Pemex and, the biggest of them all, Saudi Arabia's Saudi Aramco, which has 10 times Exxon's reserves.
A. at Stanford University two summers ago when she got an urgent call from Saudi Aramco headquarters in Dhahran.
About 30, 000 workstation computers are back online at Saudi Aramco after a virus hit the world's largest oil producer.
Mr. Saleri, president and CEO of Quantum Reservoir Impact in Houston, was formerly head of reservoir management for Saudi Aramco.
But doing so would be a long-term challenge and delivering that much might even necessitate Saudi Aramco dipping into storage.
Policy is to maintain 2 million bpd of production capacity that Saudi Aramco can turn on at nearly a moment's notice.
In April Saudi Aramco cut its output by 350, 000 bpd to 9.1 million bpd because there wasn't enough demand for the oil.
The work is part of a joint venture led by Shell (40% stake), Saudi Aramco and Total, which will explore 81, 000 square miles of desert.
Saudi Aramco has not said whether this was the malware involved.
That deal follows a major equity investment in the Fujian province where Saudi Aramco invested in petrochemical manufacturing facilities along with U.S. energy giant ExxonMobil.
Since 2004 Saudi Aramco has been fighting declining oil output from megafields like 70-billion-barrel Ghawar by doubling the number of drilling rigs to 120 this year.
"This was not the first nor will it be the last illegal attempt to intrude into our systems, " said Khalid al-Falih, president and chief executive of Saudi Aramco.
Big onshore fields in the world's most prolific hydrocarbon provinces are increasingly the preserve of national oil companies, state-owned behemoths like Saudi Aramco and Russia's OAO Rosneft and OAO Gazprom.
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The work is part of a joint venture led by Shell (40% stake), Saudi Aramco and Total, which will explore 81, 000 square miles of desert, half the size of California.
Saudi Aramco, the world's largest oil company, owns a refinery in Qingdao province and has another, in Fujian, as a joint venture with Sinopec, a Chinese petroleum giant, and ExxonMobil, an American one.
Rising oil prices have helped oil firms such as Exxon Mobil, BP and Saudi Aramco fund increased development of new oil finds which translates into higher revenues for upstream services firms such as Baker Hughes.
After acquiring British pipeline products company Wellstream Monday, and announcing a deal to supply generators for oil and gas fields to Saudi Aramco Tuesday, the conglomerate's nuclear energy joint venture is looking to secure atomic power contracts with Saudi Arabia's government.
Although the Saudi authorities do not release much evidence to support their claims of vast oil reserves, engineers from Saudi Aramco, the state-owned oil firm, do give talks at conferences and publish papers about their experience of reservoir modelling and management.
As Nansen Saleri, the CEO of Quantum Reserve Impact in Houston and former head of reservoir management for Saudi Aramco, reported in his article in The Wall Street Journal, existing oil capacity exceeds current demand by between 3 million and 5 million barrels of oil a day.
But after its privatization last year, the company, now 40% owned by Saudi Arabia's Aramco and 20% by the public, left such baggage behind.
The report comes only days after Saudi Arabia's Aramco revealed it had completed a clean-up operation after a virus knocked out 30, 000 of its computers.
Yet, in recent years, acquisitions of American energy-related assets by state-owned oil firms such as Saudi Arabia's Aramco and Venezuela's PDVSA failed to elicit so much as a murmur.
Aramco, the Saudi state oil company, sucks up nearly 10% of the country's energy output.
If you visit an organization like Aramco today, in Saudi Arabia, you will find remarkably bright, hardworking, enthusiastic Saudis fulfilling roles previously held by American expatriates.
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