Freezing method sinking well carbon dioxide phase change cracking auxiliary tunneling method and device thereof

Abstract

The invention relates to a directional CO2 cracking device. Compared with a traditional CO2 cracking device, two rows of energy discharge openings are distributed on both sides of an energy dischargehead of the directional CO2 cracking device in the axial direction, and the phase angle of the two rows of the energy discharge openings is less than 180 degrees. In the freezing method sinking well process, the multiple directional CO2 cracking devices are arranged on the outer periphery of a working face, and a plurality of common CO2 cracking devices are arranged on the inner periphery of a wellbore. The directional energy discharge openings on both sides of the energy discharge heads of the directional CO2 cracking devices face the adjacent directional CO2 cracking devices. The directionalCO2 cracking devices in an outer ring borehole are detonated first, and then the common CO2 cracking devices in an inner ring borehole are detonated. The directional CO2 cracking devices in the outerring borehole direct energy to be released along the directional energy discharge openings. Blasting can not disturb a cylinder wall structure outside the wellbore. After the outer ring borehole is blasted, a communicating weak surface is formed among the outer ring boreholes, and the entire outer ring boreholes form a protective ring. When the inner ring borehole is blasted, the protective ringformed by the outer ring boreholes cuts off the propagation of blasting energy to the cylinder wall of the wellbore, and the disturbance to the wellbore wall structure is reduced.

Description

technical field [0001] The invention relates to the field of well-sinking construction by freezing method in coal mining, in particular to a drilling method and a device thereof for assisting tunneling by freezing-sinking carbon dioxide phase change fracturing. Background technique [0002] The shaft of the vertical shaft generally passes through the surface soil and the bedrock. The construction technology has its own characteristics due to the different surrounding rock conditions. The choice of the surface soil construction plan mainly considers the safety of the project, while the bedrock construction mainly considers the construction progress. When the shaft shaft passes through the surface soil, because the surface soil is soft, poor in stability, often contains water, and directly bears the load of the wellhead structure, the construction of the surface soil is relatively complicated and often becomes the key project of the shaft construction. It is of great significa...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned pneumatic pick or drilling blasting method in the freezing method of drilling and the traditional CO 2 The problem of the inconvenience of phase change generators in shaft excavation construction, the present invention provides a directional CO 2 cracker, with conventional CO 2 Compared with the cracker, two rows of directional energy discharge ports are distributed along the axis direction on both sides of the energy discharge head, and the phase angle of the two rows of directional energy discharge ports is

Images