The 97-kilometre pipeline is designed to pump Bonny Light crude oil exports but is frequently attacked by crude oil thieves.
Previous closures of the line, which was halted on Saturday for repairs, have led to 150,000 barrels per day of production being shut in.
Reuters cited shipping lists showing Bonny Light exports for April have tumbled to around 95,000 barrels per day from 155,000 bpd for March.
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