British oil company BP has completed maintenance and resumed production at its West Azeri platform in the Caspian Sea, a spokeswoman for BP Azerbaijan Tamam Bayatly said.

Operations were suspended on May 21 for a planned 22-day maintenance but the work was completed earlier.

"Maintenance at West Azeri is over six days earlier than planned and production has been resumed," Bayatly said.

She added production had restarted last Saturday.

BP said last week it would shut another platform for planned maintenance in two months.

Oil output from the main Azeri, Chirag and Guneshli (ACG) oilfields operated by BP, which account for most of Azerbaijan's output, rose to eight million tonnes in the first quarter of 2015 from 7.9m in the same period last year, BP said in May.

Total crude oil and condensate production in Azerbaijan fell to 17.6m tonnes in the first five months of 2015 from 17.7m a year earlier, a source at the state statistics committee said yesterday.

Declining oil output at the ACG oilfields operated by BP led to the overall decline, according to sources.

Crude oil and condensate production in Azerbaijan fell to 41.9m tonnes last year from 43.1m in 2013.

Natural gas output was 29.2 billion cubic metres (bcm) in 2014. Falling output at the ACG oilfields has been a cause of concern in Baku.

Oil and gas account for 95 per cent of the country's exports and 75 per cent of government revenues.

Azerbaijan plans to produce 40.7m tonnes of oil and 30.2 bcm of gas in 2015.-Reuters