Ukrnafta plans to review the well stock in detail in order to recover it, the company said in a press release on Monday. "As of today, 4,300 wells oeprated under Ukrnafta's licenses have been liquidated. Some – for geological reasons, but most – for technical reasons: accidents, breaks in tools, pipes, the collapse of columns, etc. Accordingly, at these wells, the reserves remained undrained," Director of Ukrnafta Serhiy Koretsky said on the sidelines of the III Lviv Anti-Crisis Oil and Gas Conference Newfolk NCC.