Oil prices rise as supply concerns linger amid Houthi attacks on Saudi Arabia

Oct 23 (Reuters) - Oil prices rose on Friday after Houthi attacks in Saudi Arabia stoked concerns of further disruption to energy supplies from the Middle East.

Brent crude futures climbed 58 cents, or 0.5%, to $113.75 a barrel as of 0439 GMT, while US West Texas Intermediate crude futures rose 66 cents, or 0.7%, to $100.13.

On a weekly basis, Brent, which settled at its highest since May 4 on Thursday, is set to close higher for a third successive week, while WTI is on track to finish lower, following two weeks of gains.

Saudi Aramco 2222.SE on Thursday ordered the evacuation of its headquarters in Dhahran on the Gulf near Bahrain, Reuters reported, as fighting intensified between the world's largest crude exporter and Yemen-based Houthis.

"Markets are increasingly worried about renewed escalation in the Persian Gulf, a scenario that could threaten oil flows that have so far remained remarkably resilient," ING analysts said in a note on Friday.

"Re-escalation seems the most likely path. Even if tensions don't re-escalate, the mere possibility is likely to keep a sizeable geopolitical risk premium embedded in prices."

Clashes between the Houthis and a Saudi-led coalition that backs Yemen's internationally recognised government have raged since the Iran-aligned Houthis pushed towards Bab el-Mandeb, a shipping ​chokepoint at the mouth of the Red Sea.

"The key factors to monitor now are the extent of actual disruption and the time needed to restore operations, as these will ultimately determine how much of a supply risk premium the market is willing to pay," said Linh Tran, an analyst at XS.com.

"If attacks persist and delay deliveries, elevated prices will have a firmer foundation."

In Libya, an oil pipeline valve from the Hamada and Tahara oilfields to Zawiya port has been shut, leading to a reduction in production at both fields, the head of the National Oil Corporation told Reuters on Thursday.