Roof hydraulic fracturing multi-parameter integrated monitoring system and fracturing effect determination method

A technology for hydraulic fracturing and comprehensive monitoring, which is used in earth-moving drilling, gas discharge, safety devices, etc., which can solve the problem of crack propagation, the difficulty of obtaining pressure parameters of stress transfer law, and the inability to carry out the evaluation of the pressure relief effect of roof hydraulic fracturing. , the blind gun is difficult to deal with, etc., to achieve the effect of preventing and controlling the dynamic disaster of the rock burst roof, optimizing the construction process and optimizing the construction parameters

Active Publication Date: 2019-04-12
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the roof deep hole pressure relief blasting technology can only be used in low gas areas, and there are constraints such as the difficulty of deep hole charging and sealing, and the difficulty of handling blind blasting; while the roof hydraulic fracturing technology has its on-site construc

Method used

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  • Roof hydraulic fracturing multi-parameter integrated monitoring system and fracturing effect determination method
  • Roof hydraulic fracturing multi-parameter integrated monitoring system and fracturing effect determination method
  • Roof hydraulic fracturing multi-parameter integrated monitoring system and fracturing effect determination method

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Embodiment 1

[0036] A roof hydraulic fracturing multi-parameter comprehensive monitoring system, such as figure 1As shown, the monitoring equipment of the system may include a borehole stress gauge 1, a bolt dynamometer 21, an anchor cable dynamometer 22, a borehole peeping instrument 3, a roof monitor 4, a support resistance measuring station 5, and a microseismic measuring station 6 and the surrounding rock deformation measuring station 7, it is also possible to select a borehole peeping instrument and more than two other combined monitoring equipment for comprehensive monitoring according to the actual situation on site. Borehole stress gauge 1 is set in the recovery roadway, and the borehole stress gauge 1 is set in the range of 20-30m on both sides of the hydraulic fracturing hole, which is used to monitor the surrounding rock of the mining roadway in the hydraulic fracturing area and the non-hydraulic fracturing area. Stress magnitude and stress concentration state. Anchor bolt and ...

Embodiment 2

[0049] In order to further illustrate the roof hydraulic fracturing multi-parameter comprehensive monitoring system and the fracturing effect discrimination method proposed by the present invention, taking the 31101 working face, 31102 working face and 31103 working face of a certain mine as examples, the technical solution of the present invention is further described illustrate. The 31102 working face of this mine is located in the 3-1 coal seam, which is the second working face of this mining area. The east side of the working face is the 31101 working face, and the right side is the 31103 working face. Among them, the 31101 working face has been pushed and mined, and the return air trough of the 31102 working face is affected by the suspended roof of the 31101 working face, causing large deformation and serious bottom drum; and the 31102 working face’s auxiliary transportation trough will be used as the 31103 working face’s return air trough in the later stage , the coal ...

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Abstract

The invention provides a roof hydraulic fracturing multi-parameter integrated monitoring system and a fracturing effect determination method, and relates to the technical field of mining engineering.The roof hydraulic fracturing multi-parameter integrated monitoring system and the fracturing effect determination method solve the technical problems of observing the hydraulic fracturing effect of aroof and determining the fracturing range. Monitoring equipment includes a borehole stress gauge, anchor bolt and cable dynamometers, a borehole peeping instrument, roof monitors, support resistanceobservation stations, a microseisms observation station and a surrounding rock deformation observation station. The borehole stress gauge is disposed in a mining roadway, and the anchor bolt and cabledynamometers are disposed within a range of 10m around a hydraulic fracturing position. The borehole peeping instrument includes a peeping probe, a data acquisition device, a displacement sensor, a coil and an extension rod. The borehole fissure development state, roadway deformation displacement, microseisms events, support resistance and roadway surrounding rock stress changes in the range of hydraulic fracturing before and after hydraulic fracturing are monitored to judge the hydraulic fracturing effect and fracturing range, the reliability of multi-parameter integrated monitoring is high,the hydraulic fracturing effect is judged accurately, and roof dynamic disasters can further be avoided to ensure the safety of mining.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a multi-parameter comprehensive monitoring system for roof hydraulic fracturing and a method for judging the effect of hydraulic fracturing. Background technique [0002] With the gradual development of coal mines in my country, the intensity and frequency of coal mine roof dynamic disasters have increased significantly due to the complexity of the deep mechanical environment and changes in the mechanical properties of coal and rock. According to statistics, among all kinds of accidents in coal mines, the number of roof accidents and the number of deaths account for a large proportion, which is the key prevention and control object in coal mine accidents. With the increase of the scope of the underground stope, if the hard roof above the coal seam cannot collapse in time with the advancement of the working face, it will overhang the roof strata behind the working face ...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21F17/18
CPCE21F7/00E21F17/18E21F17/185
Inventor 赵善坤柴海涛张广辉苏振国李少刚郑伟钰李一哲刘香兰
Owner CCTEG CHINA COAL RES INST
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