A Downhole Reverse Hydraulic Plugging Removal Method

Abstract

The invention provides an underground reverse hydraulic plugging removal method, which includes acidizing construction, reverse hydraulic plugging removal construction preparation, outputting positive and negative pressure waves according to the pressure output parameters of the plugging removal operation, and setting the work frequency according to the formation feedback parameters of the target well , Control the plugging operation pressure and other steps. The downhole reverse hydraulic plugging removal method of the present invention can implement positive and negative pressure alternating operations, and cooperate with acidification measures to promote the flowback of acid liquid on the one hand, and promote the erosion and dissolution of acid liquid on blockages on the other hand, so as to realize the anti-acid The complete flowback of the liquid, the effect of the measures is greatly enhanced, the effect of blockage removal is better, and the flowback of the blockage is more thorough, which has huge economic value and wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of oil-water well plugging removal, and in particular relates to an underground reverse hydraulic plugging removal method. Background technique [0002] During the development of low-permeability reservoirs, near-well formation pollution and clogging often occur, especially in water injection development oilfields, where the incompatibility of injected water and formation fluid forms sediment or the migration of foreign solid particles causes formation and wellbore clogging, making the formation The permeability is reduced, causing problems such as under-production and under-injection. [0003] Development wells have the following forms of plugging: [0004] Various high molecular polymers (such as CMC, polyacrylamide, guar gum, etc.) remaining in the near-wellbore zone during construction operations such as drilling, well killing, hydraulic fracturing, acidification, and water plugging block the oil layer;...

AI Technical Summary

Problems solved by technology

Restricted by the limitations of the process technology itself, pollutant flowback can only be achieved through conventional large-volume backwashing wells and other technologies

Due to the poor permeability of the reservoir in the block, conventional flowback measures cannot completely return the released pollutants out of the reservoir. When the well is resumed production, the pollutants trapped in the seepage channel will form a blockage again at the throat position

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