TY JOUR TI Geological and field specifics of designing lower well completion systems in Northern Caspian fields as a basis for effective application of enhanced oil recovery methods KW oil KW gas KW oil and gas field KW well completion KW enhanced oil recovery KW bottom well completion KW offshore oil and gas fields KW well completion optimization KW well JO Oil and gas technologies and environmental safety AU Kitel, A.. AU Dukhanin, E.. AU Khaliullov, I.. PY 2025 IS 2025 PB Astrakhan State Technical University