Three-segment type block releasing technique for oil layer

The invention relates to an oil layer three-section block removing technology with excellent block removing effect. A block removing agent will be injected at three sections; then, clear water will be injected after the reaction of 4 to 24 hours at each section; the quantity of clear water will be 1 to 2 times of the sum between the volume of an oil pipe and the volume of the circular space from the bottom of the oil pipe to the top of a perforation interval. Because the composition and function of the block removing agents different from each other, the invention can be applied in a broad scope to adopt to the needs in various stratum, realize excellent block removing effect with the removing rate of over 75 percent, thus satisfying the industrial needs.