Pf. Viktorov et al., CURRENT STATUS AND PROBLEMS AT LATE AND F INAL STAGES OF FIELD DEVELOPMENT IN BASHKORTOSTAN, Neftanoe hozajstvo, (2), 1996, pp. 20-23
Major reasons for oil production declines have been identified. Among
primary problems involved in additional development of Bashkirian oil
fields are: depletion of hard-to-recover residual reserves; placing of
<<come-back>> strata on production; associated water flow limitation;
well abandonment financing, etc. It has been proved necessary to intr
oduce differentiated tax privileges to foster investments in oil explo
ration and production efforts.