A carbon dioxide ultrasonic vibration foaming device and its grading enhanced fracturing method

Abstract

The invention discloses a carbon dioxide ultrasonic vibration foaming device, comprising a water-based fracturing system, a pressure monitoring system, a high-pressure gas injection system, an ultrasonic vibration system and a central control system; the water inlet end of the high-pressure water pump is connected to a fracturing fluid storage tank, The outlet end of the high-pressure pump is connected to the inlet end of the high-pressure pipeline; the pressure sensor is connected to the data integrator through a waterproof cable; the inlet end of the high-pressure air pump is connected to the carbon dioxide storage tank, and the outlet end of the high-pressure air pump is connected to the inlet end of the gas injection string; ultrasonic transducer The device is connected to the ultrasonic generator through a transmission cable; the high-pressure water pump, data integrator, high-pressure air pump, and ultrasonic generator are connected to the central control system through a signal cable. At the same time, a carbon dioxide ultrasonic vibration foaming and grading enhanced fracturing method is also disclosed. The invention can reduce the foam loss during the transmission from the ground to the wellbore, and can realize secondary grading fracturing by first water-based fracturing and then foam fracturing, reducing the amount of fluid loss in the fracturing initiation stage, and improving the fracturing operation. Effect.

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 method for grading enhanced fracturing thereof. 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 mining. Coalbed methane is a clean energy that exists in coal seams in an adsorbed state. Because most coal seams have low permeability characteristics, it is difficult to mine. Coal seam fracturing technology is a measure that can effectively improve coalbed methane production. 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 the press...

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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