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Equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing

A coalbed methane and 1,000-meter drilling rig technology, which is applied to drilling equipment and methods, drilling equipment, and mining fluids, can solve problems such as coal mining equipment being uneconomical, increasing the range of fracturing, and less water resources, so as to improve fracturing The effect of increasing the scope of penetration, reducing the amount of construction, and reducing pollution

Active Publication Date: 2020-12-18
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide an equipment and method for mining coalbed methane by segmental water explosion fracturing of a thousand-meter borehole, so as to solve the problems of uneconomical, unenvironmental protection, and heavy equipment of existing coal mining equipment. The application of water explosion fracturing technology in coal mining operations will effectively increase the range of fracturing, more effective pressure relief, more effective promotion of coalbed methane desorption and the formation of gas production channels, and water explosion fracturing technology uses less water resources , and the ionic aqueous solution used will not cause pollution, and the implementation is simple and efficient

Method used

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  • Equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing
  • Equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing
  • Equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing

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Effect test

Embodiment 1

[0044] Such as figure 1 As shown, a kind of equipment for mining coalbed methane by segmental water explosion fracturing of a thousand-meter borehole includes a thousand-meter drilling rig 1, which excavates to form a vertical borehole 2 and intersects the vertical borehole 2 The horizontal borehole 3, and the high pumping roadway 7 that does not intersect with the vertical borehole 2, the horizontal borehole 3 is located in the coal seam, and several hydrothermal cracking cylinders 4 are arranged in the horizontal borehole 3, the The hydrothermal fracturing cylinder 4 is externally connected with a detonator, and the high pumping lane 7 is located on the center line of the blast fracture zone above the coal seam, and the high pumping lane 7 is vertically provided with a roadway 8 connected with the high pumping lane 7. An air extraction pipe is provided in the roadway 8, and the air extraction pipe is connected with the air extraction station 5 on the ground, and the air extr...

Embodiment 2

[0051] A method for mining coalbed methane by staged water explosion fracturing, comprising the following steps:

[0052] Step A: using the kilometer drilling rig 1 to drill from the ground to the coal seam to form a vertical borehole 2, continue to turn the drill bit of the kilometer drilling rig 1 to 90° and continue drilling in the coal seam for more than 1000 meters to form the horizontal Drilling 3, cleaning the drill bit of the kilometer drilling rig 1 to remove coal powder;

[0053] Step B: laying the rigid casing in the vertical borehole 2 and the horizontal borehole 3, sealing and sealing the end of the horizontal borehole 3 away from the vertical borehole 2, every two times One hydrothermal cracking cylinder 4 is arranged at a distance of the crack radius;

[0054] Step C: use the kilometer drilling rig 1 to drill from the ground to the centerline of the fissure zone above the coal seam, and turn the drill bit of the kilometer drilling rig 1 to construct the high pu...

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Abstract

The invention discloses equipment and method for exploiting coalbed methane by kilometer drilling and subsection water explosion fracturing, and belongs to the field of engineering. The equipment comprises a kilometer drilling machine (1), wherein the kilometer drilling machine (1) excavates to form a vertical drill hole (2), a horizontal drill hole (3) intersected with the vertical drill hole (2), and a high drainage roadway (7) not intersected with the vertical drill hole (2), the horizontal drill hole (3) is located in a coal seam, a plurality of hydrothermal cracking cylinders (4) are arranged in the horizontal drill holes (3), and the high-pressure drainage roadway (7) is located in the center line of a blasting fissure zone above the coal seam. According to the equipment, the problems that existing coal mining equipment is not economical, not environmentally friendly, heavy and the like are solved, a novel water explosion fracturing technology is applied to coal mining operation,the fracturing range is effectively widened, pressure is more effectively relieved, coal bed gas desorption and gas production channel formation are more effectively promoted, meanwhile, water resources used by the water explosion fracturing technology are fewer, and the used ionic aqueous solution does not cause pollution and is simple and efficient to implement.

Description

technical field [0001] The invention belongs to the field of engineering, and in particular relates to equipment and a method for exploiting coalbed methane by segmental water explosion fracturing of a thousand-meter borehole. Background technique [0002] Coalbed methane refers to hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partly free in coal pores or dissolved in coal seam water. It is an associated mineral resource of coal. Coal bed methane is very clean after burning, and its calorific value is equivalent to that of natural gas. At the same time, coal bed methane is also a greenhouse gas, and its greenhouse effect is about 21 times that of carbon dioxide. Therefore, the development and utilization of coalbed methane has multiple effects, not only obtaining clean energy but also reducing greenhouse gas emissions. [0003] my country's thin coal seams and deep coal seams are rich in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/26E21B43/24E21B7/04E21B37/00
CPCE21B43/00E21B43/26E21B43/2405E21B7/046E21B37/00
Inventor 王恩元王小飞胡少斌季淮君
Owner CHINA UNIV OF MINING & TECH
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