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Gas-liquid combination directional cracking device and method

A cracking, gas-liquid technology, applied in the field of gas-liquid combined directional cracking device, can solve problems such as poor cracking effect of liquid carbon dioxide phase transition

Inactive Publication Date: 2019-06-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a gas-liquid combination directional fracturing device and method to solve the problem of poor effect of phase change fracturing of existing liquid carbon dioxide

Method used

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  • Gas-liquid combination directional cracking device and method
  • Gas-liquid combination directional cracking device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] figure 1 Schematic diagram of the structure of the gas-liquid combined directional fracturing device provided in Example 1, as shown in figure 1 As shown, this embodiment provides a gas-liquid combined directional fracturing device, including: CO 2 Phase change generator 1 and hole sealer 2. The gas-liquid combination directional fracturing device is arranged in the pre-constructed borehole, in which:

[0049] Such as figure 2 as shown, figure 2 CO provided for Example 1 2 Schematic diagram of the structure of the phase change generator, CO 2 The phase change generator 1 is a cylindrical structure with liquid CO stored inside 2 , CO 2 The first end of the phase change generator 1 is provided with a plurality of nozzles 130 , and the second end thereof is connected to the hole sealing device 2 . CO 2 Phase change generator 1 is used to convert liquid CO 2 to gaseous CO 2, and is filled into the borehole by the spout 130, and the borehole is pre-cracked. The...

Embodiment 2

[0063] Figure 5 The schematic diagram of the gas-liquid combined directional fracturing device provided for Example 2, as Figure 5 As shown, on the basis of the above-mentioned first embodiment, this second embodiment provides another gas-liquid combined directional fracturing device.

[0064] In coal mines, for hard roof or top coal, in order to improve the effect of fluid pressure fracturing, multiple linearly arranged drill holes can be densely constructed in the same plane. A set of gas-liquid combination directional fracturing device is arranged in each borehole, and the heating module 110 of each gas-liquid combination directional fracturing device is led out of the hole through the lead wire 111 to be connected in series; The high-pressure water pipe 3 connected to the hole sealer 2 in the directional fracturing device is connected in parallel through the multi-way 5, and a general water injection valve 31 is set on the multi-way to open or close the water injection ...

Embodiment 3

[0070] Image 6 A schematic flow chart of the gas-liquid combined directional fracturing method provided in Example 3; Figure 7 In the gas-liquid combined directional fracturing method provided in Example 3, the liquid CO 2 Schematic flow chart of phase change fracturing and hydraulic fracturing. Such as Image 6 with Figure 7 As shown, the present invention provides a gas-liquid combination directional fracturing method. The gas-liquid combination directional fracturing method provided in this embodiment uses the gas-liquid combination directional fracturing device provided in the above-mentioned embodiment 1 or embodiment 2 to realize coal Rock internal fluid pressure fracture. Specifically, such as Image 6 As shown, the gas-liquid combined directional fracturing method provided in this embodiment includes:

[0071] S101: Drilling at least one borehole in the coal body;

[0072] Specifically, the depth and extension direction of the construction borehole can be com...

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Abstract

The invention provides a gas-liquid combination directional cracking device and a method thereof. The gas-liquid combination directional cracking device is arranged in a borehole, comprising a CO2 phase change generator and a hole packer, wherein the CO2 phase change generator is of a cylinder structure, and with liquid CO2 stored inside, a first end of the generator is provided with a plurality of nozzles, and a second end is connected with the hole packer; the hole packer is of an elastic capsule structure, arranged in the back end of the CO2 phase change generator and connected with a high-pressure water pipe; the hole packer expands with water injection and is used to pack the borehole. At first, the gas-liquid combination directional cracking device arranged in the borehole performs CO2 phase change cracking in the borehole, in order to instantly release the gas in the CO2 phase change generator into the borehole to directionally pre-crack the inner wall of the borehole, and thenperforms hydraulic cracking to the borehole to allow the hydraulic crack to continuously expand, thereby forming a wide range of hydraulic crack zone in the coal and rock mass, and achieving governance of the hard roof, top coal and percussive ground pressure in a coal mine; at the same time, the permeability of a coal seam is improved, which is beneficial to coal seam permeability improvement andoutburst elimination.

Description

technical field [0001] The invention relates to the field of coal mines, in particular to a gas-liquid combined directional fracturing device and method. Background technique [0002] Liquid CO 2 Phase change fracturing technology is a new type of physical blasting technology at present. In the process of mining mineral resources, liquid CO is used to 2 Heat-absorbing gasification produces instantaneous high pressure to crack coal and rock mass, which can replace traditional explosive blasting, and can be used for blasting coal drop, roof and rock burst treatment, coal seam enhancement and outburst reduction, top coal weakening, Shimen coal removal, coal bunker Clearing etc. [0003] In coal mines, using liquid CO 2 Phase change fracturing replaces traditional blasting technology to fracture coal and rock mass. Since the coal and rock mass is in a three-dimensional stress state (no free surface), the crack propagation length is short and the range is small, resulting in p...

Claims

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Application Information

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IPC IPC(8): E21C37/14
Inventor 黄炳香赵兴龙李鹏锋
Owner CHINA UNIV OF MINING & TECH
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