Scope of Application

This technology is applicable to pressure drop and augmented injection of well of medium to low permeability sandstone reservoir. 

Principles 

This technology combines the deep plug releasing and oil driving technology, which injects several acid-base pluggings of different components in to stratum and mix to form various phase states. On the one hand, it can remove the acid and alkali soluble blockage; on the other hand, CO2 will be generated by reaction of acid and alkali in oil layers, which can dredge the permeable channels. This technology applies to pressure pressure drop and augmented injection of water injection well with low permeability. 

Construction Process

1.Pretreatment plugging 

2.Acid plugging→spacer fluid→alkali plugging: replace the rear protective plugging after 5-8 cycles.

Field Applications 

Since 2006, this technology has been applied for 135 wells/times in many major oil fields nationwide with process success ratio of 100%, efficiency of 83% and remarkable effects of pressure drop and augmented injection.