Abstract: Bai9 reservoir is low permeability and complex fault block reservoir, its structure is complex with high formation angle and difficult development. Aimed at the disadvantage factors that influence oilfield production, the new theories, the new technologies and the new methods are applied. The measures such as fracturing, acidizing, perforations adding etc. are applied successively in the reservoir. And old well worked over, old well plugged back, periodic water injection etc. are used at high water cut stage. The field practice makes it clear that the results are very good. The measures slow the rising velocity of water cut, increase exploitable reserve and improve oilfield exploitation results. The technologies may be applied in other low permeability and complex fault block reservoirs.

Key words: low permeability reservoir, complex fault block reservoir, technology for stabilizing production, old well worked over, periodic water injection