Abstract:

To vertically heterogeneous reservoir in which,waterflooding efficiency is low,Interlayer contradiction is serious,and low-permeability reservoir is ifficultly produced.New long core test model is developed with three pressure nodes measured on the each experimental long core of three long cores.The result is that different water injection methods,for example,mixed water injection or water separating injection,exsert greatly impact on middle-permeability and low-permeability reservoir recovery.The pressure of the reservoirs with different peamility can be increased by enhancing injecting rate,and the lower permeability is,the higher pressure can be increased.Interlayer interference is serious,low permeability reservoir pressure changes greatly under the condition of different water injection methods.The conclusion affords experimental foundation for rightful layer series of development assemble and water injection methods.

Key words: vertical heterogenity, interlayer interference, water-flooding oil experiment, injecting rate, recovery