Russia has the second largest oil reservation in the world, and the countries adjacent Russia also have rich oil reservations. But considering their natural environment, the drilling work is not easy to do, cause for nearly half a year, the those countries are covered by snow, in some places like Uzbekistan and Siberia in Russia, the temperature could as low as minus 50 degrees centigrade.
It is really a tough task for the mechanical equipment, for the lubrication and stable operating, cause ...