In order to ease the contradiction between layers, layer system adjustment is applied in oilfield development and separated layer water flooding is realized better. This method is a major adjustment measure to improve development effects. DQY103 is a typical low-permeability oilfield and physical property is poor. Many problems are existed, such as apparent contradiction between layers, and poor development effects and so on. In this article, the physical property and thickness of barrier, injection profile, permeability contrast and remaining oil distribution are analyzed comprehensively. A reasonable method is also proposed. Much weakness which exists in the former methods is overcome. For example, factors are not comprehensive and accurately reflected. Poor thin layers are produced better. Invalid water injection and contradiction between layers are decreased. Development effects are improved eventually. It is a reference and guidance for other blocks which exists the same problem.

Production prediction model and waterflooding characteristic equation considering threshold pressure were deduced. Based on them, a combined solution model was established, which can predict development indexes in low permeability reservoirs. The development indexes of a typical low permeability block YS2 were forecast using the combined solution model. Forecast results and actual production data fit well, which confirms the practicability and validity of the combined solution model. It has important practical significance to guide low permeability oilfield development.