An acid atomization device and atomization method for deep acidification of fractured-vuggy reservoirs

Abstract

An acid atomization device for deep acidification of fracture-cavity reservoirs, comprising a gas path system, a liquid path system, and an atomizing nozzle; the gas path system includes a gas inlet, an air compressor; the liquid path system includes an acid liquid inlet, a high-pressure acid-resistant Pump, double-flow venturi tube; air enters the gas inlet after being pressurized by the air compressor; acid liquid enters the annular cavity after being pressurized by the high-pressure acid-resistant pump, and the annular cavity is used to accumulate acid liquid, and the acid liquid in the annular cavity The acid liquid enters the cylindrical cavity through the acid liquid inlet on the wall, and acid mist is formed in the cylindrical cavity due to hydraulic cavitation, and the acid mist is constrained by the cylindrical cavity to become an acid mist columnar fluid, which occurs during atomization The high-speed movement inside the atomizer and finally sprayed out from the atomization nozzle of the atomization generator, which is directly connected with the wellbore. The device has good performance in high temperature resistance, high pressure resistance and acid resistance. It can control the injection displacement through the gas and liquid system, maintain a high atomization rate of acid liquid, and improve the acidizing effect of fracture-cavity reservoirs.

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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