* Russian oil output at record high of 11.11 mln bpd in Sept

* Russia, OPEC talk cooperation

* Rosneft Sechin says Moscow may add another 4 mln bpd in future

(Adds details, quotes, background)

By Oksana Kobzeva

VERONA, Italy, Oct 20 (Reuters) - Russia, already the world's top oil producer, has the potential to further increase oil output in the future by up to 200 million tonnes a year, or 4 million barrels per day, Rosneft's ROSN.MM chief executive Igor Sechin said on Thursday.

Russia and OPEC are seeking a way to cooperate to prop up oil prices, hit by global oversupply. But consensus must first be found inside OPEC for Moscow to join, officials have said.

OPEC agreed in Algiers on Sept. 28 to reduce production to a range of 32.5 million to 33 million barrels per day, which would be its first output cut since 2008. Another meeting on Nov. 30 is set to firm up details of the accord.

"In the next year and a half we should see the end of surplus (on global oil markets) and the start of the process of the situation normalising," Sechin told a forum in Italy, adding that he saw oil prices rising to above $55 per barrel by then.

Russian oil output jumped by almost 4 percent in September from the previous month to 11.11 million barrels per day (bpd), a new post-Soviet record-high, as companies ramped up drilling amid improved oil prices.

Russian officials have said that Moscow would rather freeze oil output than cut, but the level is yet to be agreed. Russia's biggest oil companies such as Rosneft, Gazprom Neft SIBN.MM and Lukoil LKOH.MM are launching new fields in 2016.

"If the market needs it and there are technological and economic grounds, Russia may significantly increase oil production in the future by up to 200 million tonnes," Sechin told the forum. He did not give a time frame for the increase.

Last year Sechin said Russia could raise oil production to over 14 million bpd in the next two decades. urn:newsml:reuters.com:*:nL5N11A1AI

Russian Energy Minister Alexander Novak plans to meet his Saudi counterpart Khalid al-Falih this weekend to discuss coordination of possible actions on the global oil market.

Gazprom Neft, the oil arm of Russian state gas firm Gazprom GAZP.MM , could slow its oil output growth compared with the current plan if needed, its Chief Executive Alexander Dyukov told Rossiya 24 TV in an interview broadcast on Tuesday. urn:newsml:reuters.com:*:nL8N1CO5WR

(Reporting by Oksana Kobzeva; Additional reporting by Giancarlo Navach; writing by Katya Golubkova; Editing by Maria Kiselyova and Adrian Croft) ((ekaterina.golubkova@thomsonreuters.com; +7 495 775 1242;))