Adnoc Drilling appoints Abdulla Al Messabi as chief executive
Current chief Abdulrahman Al Seiari will remain in an advisory capacity and retire at the end of the year
Oil prices fall but face volatility from US-Iran tension
Americans plan to evacuate non-essential staff from Iraq as nuclear deal talks with Tehran stall
US energy production hit new record last year, agency says
US is the largest crude oil producer in the world
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