UPGRADE OF A CONVENTIONAL PUMPING UNIT WITH A COMPRESSOR FOR PRESSURE REDUCTION IN THE CASING, AIMED AT INCREASING OIL AND GAS PRODUCTION AND REDUCING CO2 EMISSIONS. ume [Internet]. 2026 July 1 [cited 2026 Nov. 14];1(48):19-38. Available from: https://ume.rgf.bg.ac.rs/index.php/ume/article/view/232