Abstract
By considering the long history of water injection in oil fields, we used several sandstone cores with different permeability to conduct experimental tests. The damage effect of formation permeability caused by five types of injected water based on an oilfield water quality standard (SY/T 5329-2012) was investigated. A model for water quality sensitivity to permeability was proposed, and through theoretical derivation, a mathematical expression that described the attenuation law of permeability was established. This study provides a theoretical basis for the re-selection of water quality in oilfields developed through long-term water injection and improves the effectiveness of water flood development.
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