• FILE- In this Wednesday, Sept. 9, 2009 file photo, smoke rises from an oil pipe at sunset in the desert oil field of Sakhir, Bahrain. OPEC nations have agreed in theory that they need to reduce their production to help boost global oil prices during a meeting in Algeria, but a major disagreement between regional rivals Saudi Arabia and Iran still may derail any cut. (AP Photo/Hasan Jamali, File)

    AP Explains: What does OPEC’s tentative deal mean for oil?

    DUBAI, United Arab Emirates (AP) — OPEC nations have agreed in theory that they need to reduce their production to help boost global oil prices during a meeting in Algeria, but a major disagreement between regional rivals Saudi Arabia and Iran still may derail any cut. What happened to oil prices and why can’t OPEC agree to anything more binding?