It is shown, that D5 formation development utilizing formation mixture elastic energy till formation pressure reaches saturation pressure has enabled to recover about 6% of reserves. It is noted, that some disagreement between injected and produced volumes during certain development periods (1990, 1993 and 1995) has led formation pressure to become lower, than saturation pressure. It is recommended to maintain formation pressure slightly above saturation pressure together with strict observation of the balance between formation fluids production and injected water volumes.