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Monitoring method for regional hydraulic fracturing

A hydraulic fracturing, regional technology, applied in the direction of surveying, earthwork drilling, mining fluids, etc., can solve the problems of undeveloped monitoring methods for ultra-long holes, reduced continuity of hard roofs, and easy caving, etc., to achieve good results. Stress control effect, optimized fracturing parameters, high reliability effect

Active Publication Date: 2020-05-19
CCTEG COAL MINING RES INST
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  • Application Information

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Problems solved by technology

In the subsequent mining process, the continuity and strength of the fractured hard roof is reduced, so it is prone to caving
[0008] At present, there is no mature monitoring method for hydraulic fracturing of ultra-long holes (that is, regional hydraulic fracturing)

Method used

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  • Monitoring method for regional hydraulic fracturing
  • Monitoring method for regional hydraulic fracturing
  • Monitoring method for regional hydraulic fracturing

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Embodiment Construction

[0036] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

[0038] Please refer to ...

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Abstract

The invention relates to the field of underground mining, and provides a monitoring method for regional hydraulic fracturing. The monitoring method comprises the following steps of monitoring fracturedevelopment, specifically, setting a first monitoring unit group to collect wave signals of crack expansion in the fracturing process of a roof fracturing area; monitoring stress after fracturing, specifically, setting a second monitoring unit group to collect the variation of a stress field before and after hydraulic fracturing; and monitoring stress after recovery, specifically, setting a thirdmonitoring unit group to collect the stress variation of a fracturing area and a non-fracturing area. The monitoring method for regional hydraulic fracturing has the advantages of being easy to operate, high in practicability, capable of achieving multiple times of testing, high in precision and reliability and the like, coupling integrated monitoring can be conducted on the whole process of thehydraulic fracturing effect from the fracturing stage to the recovery stage, and a detailed monitoring method is provided; fracture development, the stress after fracturing and the stress after recovery can be monitored; and comprehensive monitoring of ''line to plane'' and ''surface load to internal stress'' in the hydraulic fracturing process can be achieved.

Description

technical field [0001] The invention relates to the field of well mining, in particular to a monitoring method for regional hydraulic fracturing. Background technique [0002] The geological conditions in the process of underground mining are complex and changeable, and the occurrence characteristics of geological conditions have a direct impact on the safety of underground mining of coal resources. According to statistics, there are dense and hard roofs with high strength and large thickness in the Datong area of ​​Shanxi Province, the Hujierte mining area in Inner Mongolia, Henan, Heilongjiang, Shenfu area in northern Shaanxi, and Shandong mining areas. [0003] When there is a hard roof above the mining face, it will bring serious threats to the working face and the mining roadway. If comprehensive mechanized coal mining is implemented under this type of roof, the support will bear a large load and often crush the support; the mining roadway The stress concentration is t...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B47/06E21B47/00
CPCE21B43/26E21B47/06E21B47/00
Inventor 郑建伟鞠文君孙晓冬马兆瑞郑仰发祝凌甫伊丙鼎
Owner CCTEG COAL MINING RES INST
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