KIEV, June 14 – Nine companies have submitted their bids for a tender called by gas producer Ukrgazvydobuvannia to buy services of 100 hydrofracking operations in 2016-2017.

Among them are six foreign companies, including the world's oil servicing leaders Halliburton Ukraine, Schlumberger Services and Weatherford, Ukrgazvydobuvannia's press service said.

After their bids and technical documents are checked, there will be the second stage of the tender – a Dutch auction to select the lowest bid, after which the winner will be named.