Comprehensive monitoring method for well and ground combined coal-seam hard top plate segmented hydraulic fracturing

Abstract

The invention provides a comprehensive monitoring method for well and ground combined coal-seam hard top plate segmented hydraulic fracturing. An in-hole television detection technology is exerted andcombined with an audio electric perspective technology, the fracture development position and degree under the original condition are revealed, and the original low-group area of the working face isjudged. By means of a micro-seismic monitoring system, fracture development plane and profile distribution characteristics in the fracturing process are carried out in real time. After fracturing, in-hole television and audio electric perspective detection results are utilized, a micro-seismic test result is integrated, and the fracturing crack initiation position and direction and a fracture development scale and spreading form are obtained. The fracturing crack initiation position and direction are effectively disclosed, the fracture development scale and morphology are combined, precise design of a directional long drilling trajectory is achieved, a technical support is provided for parameter controllable providing, the drilling efficiency can be improved, and the drilling constructiondifficulty is reduced. The monitoring blind area and the blind section of a conventional method are avoided, the monitoring precision is greatly improved, and the fracturing effect is accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of underground safety in coal mines, in particular to a comprehensive monitoring method for segmental hydraulic fracturing of coal seam hard roof combined with underground. Background technique [0002] Hard and difficult-to-collapse roofs are commonly developed in coal seams in my country. In the mine production process, such roofs are difficult to collapse in time, and it is easy to form a large area of ​​suspended roofs in the gob. The pressure phenomenon will cause the support of the working face to be crushed, the equipment will be damaged, the bottom drum and side drum of the roadway will be seriously deformed due to mining, the original support will fail, and even vicious accidents that endanger personal safety will occur. [0003] With the continuous and in-depth research on the control measures of hard roofs at home and abroad in recent years, scholars in related fields have put forward the measures ...

AI Technical Summary

Problems solved by technology

By arranging monitoring instruments in the fracturing monitoring area and receiving wave energy signals, the microseismic source, that is, the rock crack initiation location, can be determined. However, microseismic can only reflect the spatial location and direction of fracture development, and cannot predict the extension scale and development of fracturing fractures. Cloth shape for precise positioning

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