sentences:  He established a bitumen mine "de la Presta" there in 1719 that operated until 1986.In 1745 under the Empress Elizabeth of Russia the first oil well and refinery were built in Ukhta by Fiodor Priadunov.Through the process of distillation of the "rock oil" (petroleum) he received a kerosene-like substance, which was used in oil lamps by Russian churches and monasteries (though households still relied on candles).