TY JOUR TI DEVELOPMENT AND EXAMINATION OF PARAMETERS OF PNEUMATIC SUCKER-ROD UNIT FOR OIL EXTRACTION KW hydraulic sucker-rod pump unit KW superficial equipment KW working liquid KW gas factor KW pneumatic sucker-rod pump unit KW column of rods KW pneumatic cylinder KW centrifugal compressor KW receiver KW oil and gas separator JO Vestnik of Astrakhan State Technical University AU Marysheva, M.. AU Shishkin, N.. PY 2014 IS 2014 PB Astrakhan State Technical University