A new method for division water injection layers based on difference of interlayer percolation resistance

Dynamic split model for injection fluid of water drive oil production was established based on theoretical calculation. It can be used to analyse the mutual interference between the layers in the arbitrary water cut stage and predict the occurrence and aggravation of the interference node. The results show that: Liquids preferentially pass through areas with low percolation resistance, so the difference of interlayer percolation resistance is the essence of interlayer contradiction; Percolation resistance is mainly determined by the difference of layers (Permeability and Thickness of layer) and dynamic water status. The greater the percolation resistance difference is, the worse the average degree of injection fluid is, and the lower the oil production efficiency is; A new method of water injection layer division was established to weaken the interlayer interference from the source. This method considered influence factors of permeability, thickness and water cut. And the new method is better than the old method of assigning water injection interval only by the limit of permeability differential. It can guide the high efficiency production of oil field.