Investing.com - Crude oil prices rose in volatile trade on Friday as OPEC ministers prepared to start a Vienna meeting which Iran's oil minister said would stick with a policy of maintaining output unchecked, in line with market expectations. Brent crude oil futures were last up 29 cents at $44.13 a barrel at 0921 GMT, having fallen earlier this week to a low of $42.43, within cents of August's 6-1/2 year trough. Saudi Arabian oil minister Ali al-Naimi said ahead of the meeting growing global demand could absorb an expected jump in Iranian production next year.