Carbon dioxide ultrasonic oscillation foaming device and graded fracturing strengthening method thereof

Abstract

The invention discloses a carbon dioxide ultrasonic oscillation foaming device. The carbon dioxide ultrasonic oscillation foaming device comprises a water-based fracturing system, a pressure monitoring system, a high-pressure gas injection system, an ultrasonic oscillation system and a central control system; the water inlet end of a high-pressure water pump is connected with a fracturing fluid storage tank, and the water outlet end of the high-pressure water pump is connected with the water inlet end of a high-pressure pipeline; a pressure sensor is connected with a data integrator through a waterproof cable; the gas inlet end of a high-pressure gas pump is connected with a carbon dioxide storage tank, and the gas outlet end of the high-pressure gas pump is connected with the gas inlet end of a gas injection pipe column; an ultrasonic transducer is connected with an ultrasonic generator through a transmission cable; and the high-pressure water pump, the data integrator, the high-pressure gas pump and the ultrasonic generator are connected with the central control system through signal cables. Meanwhile, the invention further discloses a carbon dioxide ultrasonic oscillation foaming graded fracturing strengthening method. According to the carbon dioxide ultrasonic oscillation foaming device and the graded fracturing strengthening method thereof, foam losses in the transmission process from the ground to a shaft can be reduced, secondary graded fracturing can be achieved through water-based fracturing and then foaming fracturing, the filter loss in the fracturing initiation stage is reduced, and the fracturing operation effect is improved.

Description

technical field [0001] The invention relates to the technical field of coal seam fracturing, in particular to a carbon dioxide ultrasonic vibration foaming device and a step-by-step strengthening fracturing method. Background technique [0002] With the rapid development of my country's economy, the demand for energy is increasing, and coalbed methane, a newly emerging energy source, has gradually become the focus of exploitation. Coalbed methane is a clean energy that exists in coal seams in an adsorbed state. Because most coal seams have low permeability characteristics, mining is difficult. Coal seam fracturing technology is a measure that can effectively increase the production of coalbed methane. The existing coal seam fracturing technologies include: water-based fracturing, foam fracturing, acid fracturing, etc. Water-based fracturing technology is the most commonly used The principle of fracturing technology is to inject pressure fluid into the wellbore to increase t...

AI Technical Summary

Problems solved by technology

However, after the foam fracturing fluid is prepared on the ground at the fracturing site, it needs to be transported from the ground to the underground. During the transmission process, the amount of foam bursting is large, which affects the fracturing effect.

At the same time, because the foam fracturing fluid contains a relatively large proportion of gas phase components, the fluid loss is relatively large, and usually requires an excessively high fracturing pressure, which leads to certain difficulties in the implementation of the carbon dioxide foam fracturing process.

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