Acid liquid atomization device for deep acidification of fractured-vuggy reservoir and atomization method thereof

Abstract

The invention discloses an acid liquid atomization device for deep acidification of a fractured-vuggy reservoir. The acid liquid atomization device for deep acidification of the fractured-vuggy reservoir comprises a gas path system, a liquid path system and an atomization nozzle; the gas path system comprises a gas inlet and an air compressor; the liquid path system comprises acid liquid inlets, ahigh-pressure acid-proof pump and a double-flow type Venturi tube; air is pressurized by the air compressor and then enters the gas inlet; and acid liquid is pressurized by the high-pressure acid-proof pump and then enters an annular cavity, the annular cavity is used for accumulating the acid liquid, the acid liquid in the annular cavity enters a cylindrical cavity through the acid liquid inletsformed in the wall, acid mist is formed in the cylindrical cavity as the hydrodynamic cavitation effect, the acid mist is constrained by the cylindrical cavity to form acid mist columnar fluid, the acid mist columnar fluid moves at high speed in an atomization generator and is finally sprayed out from the atomization nozzle of the atomization generator, and the atomization nozzle is directly connected with a shaft. The acid liquid atomization device for deep acidification of the fractured-vuggy reservoir has the good high temperature resistance, high pressure resistance and acid resistance, the injection displacement can be controlled through the gas path system and the liquid path system, the high acid liquid atomization rate is kept, and the acidification effect of the fractured-vuggy reservoir is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an acid liquid atomization device for deep acidification of fracture-cavity oil reservoirs and a method for using the device for atomization. Background technique [0002] Acidizing is the main technical measure for developing carbonate reservoirs with low porosity and low permeability. The main factor affecting the dissolution morphology of carbonate rocks during the acidification process is H + Mass transfer velocity and surface reaction velocity. When H + When the mass transfer rate is lower than the surface reaction rate, the dissolution form is surface dissolution, otherwise it is uniform dissolution, only when H + When the mass transfer rate is similar to the surface reaction rate, the dissolution form is wormhole dissolution. The shape of acid-etched wormholes can directly affect the effect of acidification through spatial distribution...

AI Technical Summary

Problems solved by technology

The core driving force of the ultrasonic atomization generator is the cavitation effect of ultrasonic waves in the liquid. Although the higher the temperature of the liquid, the more favorable the generation of cavitation is, but when the temperature is too high, the vapor pressure in the bubbles increases, so when the bubbles close The buffering effect is enhanced, and the cavitation effect is weakened, which is not conducive to the acidizing application of deep wells in oil fields

As far as the present stage is concerned, although some domestic scientific research institutes have done preliminary research on the characteristics and mechanism of ultrasonic atomization and achieved certain results, due to the complexity of the mechanism of ultrasonic atomization, the resonance characteristics and influencing factors are more complicated, most of them research is limited to the analysis of experimental phenomena

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