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Method for uniformly fracturing coal body by compounding hydraulic power and liquid nitrogen

A hydraulic fracturing and liquid nitrogen technology, which is applied in coal fracturing and hydraulic-liquid nitrogen composite uniform fracturing of coal, to achieve the effects of improving safety and economic benefits, improving safety and improving economic benefits

Inactive Publication Date: 2020-03-27
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] However, the application of single hydraulic fracturing or liquid nitrogen freezing fracturing to coal and rock mass will be plagued by the contradictory requirements of "low cost" and "sufficient and uniform fracturing".

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  • Method for uniformly fracturing coal body by compounding hydraulic power and liquid nitrogen

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Embodiment Construction

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. ; Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention. Matters not covered in the present invention are known technologies.

[0020] Such as figure 1 As shown, the embodiment of the present invention proposes a composite fracturing method that can achieve sufficient and uniform fracturing of the coal body, including the following steps:

[0021] (1) Horizontal fracturing drilling is carried out on the side of the selected mining roadway. The diameter of the fracturing drilli...

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Abstract

The invention discloses a method for uniformly fracturing a coal body by compounding hydraulic power and liquid nitrogen. The method comprises the following specific steps: constructing a horizontal fracturing drilling hole in a selected side of an excavation roadway, sealing the hole, and connecting the hole to a hydraulic fracturing system and a liquid nitrogen fracturing system separately; starting the master control to coal body hydraulic fracturing through a hydraulic fracturing control operation table, wherein a hydraulic fracturing process comprises two stages, the first stage is a conventional hydraulic fracturing stage, and the second stage is a sand-containing hydraulic fracturing stage; after the hydraulic fracturing process is ended, immediately starting liquid nitrogen freezing to a coal body to cause fracture through a liquid nitrogen fracturing control operation table; and after the fracturing of each fracturing drilling hole is ended for 48 hours, performing the hydraulic fracturing and liquid nitrogen fracturing of next fracturing drilling hole until the fracturing of the last fracturing drilling hole is completed.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and relates to coal fracturing, in particular to a hydraulic-liquid nitrogen compound uniform fracturing method for coal. Background technique [0002] The success of the shale gas revolution in North America has promoted the research on coal and rock mass fracturing methods by scholars from various countries. At present, it is generally believed that hydraulic fracturing technology has a high application effect in realizing coal and rock mass fracturing. However, due to the requirements of hydraulic fracturing on water resources and the high cost of fracturing, waterless fracturing technology has become one of the research hotspots of coal and rock mass fracturing methods in the future. Among them, liquid nitrogen freezing fracturing technology, as a new coal and rock mass fracturing method, has been applied in the field of oil exploitation. The fracturing principle of this fracturing techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/267
CPCE21B43/006E21B43/267
Inventor 郑闯凯李学华种照辉
Owner CHINA UNIV OF MINING & TECH
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