The deepest well ever drilled in Romania is well No. 7000 MP Tintea Baicoi Floresti Calinesti spud at 7025 meters in Baicoi-Tufeni, Prahova county. To drill so deep an F-400 drilling rig was used. F-400 was designed at the Petroleum Equipment Design and Research Institute - IPCUP Bucharest/Ploieşti and manufactured by "1Mai" Ploieşti . The drilling started in 1980 and was finished in 1984. It showed traces of crude oil at a depth of 6,191 m, and from the interval 7,021-7,023 m a sample of mechanical core was taken. The core was analyzed in the laboratories of ICPT (Technological Research and Design Institute - Câmpina). The production tests were carried out with a 1400 bar X-mas tree produced at the Câmpina Mechanical Plant (now privatized and taken over by the Americans, as PCC Sterom – Cameron Romania, then taken over by "Tenaris") on the wellhead. The drilling of this well was started by I.F.L.G.S. Bucharest with a team that was preparing for the first marine drilling well in the Black Sea (rig manager Eng. Dan Marchidan) then the well was taken over by the Liliești Drilling Rig (rig manager Eng. Sârbu Ion, former director of the Ploiești Petrol Trust). Nowadays the well is abandoned.
