Method and device for adjusting unstable injection-production well pattern in development layer series

The invention discloses a method and a device for adjusting an unstable injection-production well pattern in a development layer series. The method comprises the following steps of: determining a half period for adjusting the unstable injection-production well pattern; an original well pattern is transformed into a new well pattern composed of four five-spot well patterns from an inverted nine-spot well pattern; in the first half period and the second half period, the water injection amount, the liquid production amount, the water injection period and the liquid production period of the high-permeability area and the low-permeability area are controlled in a differentiated mode; and finally, alternately implementing the first half cycle and the second half cycle until the water content of the oil field reaches 100%. According to the method, the mode of adjusting the well pattern mode and the mode of changing the well working system are combined, the water injection amount and the liquid production amount and