Abstract:

The low-permeability reservoir is remarkably characterized by threshold pressure gradient,which makes high filtration resistance,declines sweep scope of injected water,owing to the threshold pressure gradient in the process of the fluid flow through porous media,how to confirm the injected water effective scope is one of the key techniques to develop the low-permeability reservoir effectively.According to the theory flowing through porous media for the iso-production one source-one convergence point,the maximum compression gradient isarithmic line equation of flooding unit is obtained.On the basis of certain reasonable injector and producer distance,in this article analytic theory and method of determining the injected water effective incidence with the consideration of the influencing of the threshold pressure gradient is established and plate of injected water effective incidence under different obtained.

Key words: low-permeability reservoir, injection-production well spacing, one source-one convergence point, effective scope, threshold pressure gradient