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Method for determining effective monitoring distance of coal mine underground hydraulic fracturing microseism

A technology for hydraulic fracturing and determining methods, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of small microseismic energy, limited propagation distance, and far away from the source point of the geophone. Simple to use effects

Active Publication Date: 2020-06-09
CHONGQING UNIV
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Problems solved by technology

The disadvantage of installing the geophone in the borehole is that additional drilling needs to be drilled under the mine, and the geophone cannot be recovered
However, due to the excessive pursuit of grid format, the geophone is far away from the source point, and the microseismic energy generated by hydraulic fracturing in coal mines is small, and the propagation distance is limited. This method is not suitable for underground hydraulic fracturing microseismic monitoring.
[0004] Before the implementation of microseismic monitoring in coal mines, a calibration shot is usually placed. The calibration shot is only used to measure the wave velocity, and the amplitude and frequency attenuation characteristics of the microseismic waves generated by blasting are not fully utilized. As a result, many geophones placed in the actual monitoring process cannot detect microseismic waves. signal, wasted detector
In the microseismic monitoring of hydraulic fracturing in coal mines, there is no practical technical means to determine the geophone layout distance, which has caused difficulties and waste to the construction of microseismic monitoring

Method used

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  • Method for determining effective monitoring distance of coal mine underground hydraulic fracturing microseism

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0023] The present invention comprises the following steps:

[0024] Step 1. Put the calibration gun and arrange the detector, record the signal, follow the steps below:

[0025] 11) If figure 1 and figure 2 As shown, the calibration blasting point 1 is selected in the roof rock roadway 4 near the pre-fracturing reservoir 3; the geophones 2-1~2-10 are arranged at equal intervals in the floor rock layer roadway 5, and the distance between each geophone and the blasting point is increase at one time.

[0026] The pre-fracturing reservoir 3 has a coal seam 6, a roof 7 and a floor 8; the roadway is arranged in the rock formation: that is, the roof 7 and the bottom plate 8, and the coal seam roadway is not excavated until the drainage reaches the standard and the gas risk is eliminated.

[0027] 12) Connect the geophone to the microseismic signal acquisition ...

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Abstract

The invention discloses a method for determining the effective monitoring distance of a coal mine underground hydraulic fracturing microseism and fully utilizes the amplitude and frequency attenuationcharacteristics of the microseism. The method comprises steps of of 1, placing a calibration gun, arranging a detector and recording a signal; 2, extracting signal amplitude and centroid frequency; 3, drawing an amplitude attenuation curve; 4, drawing a frequency contour line; and 5, determining the effective monitoring distance of the microseism. The method is advantaged in that reliable data are provided for the effective monitoring distance of the microseism in the underground coal mine hydraulic fracturing, and a technical scheme is provided for arrangement of a detector and a mobile detector in the construction process, and the method is suitable for coal mine underground hydraulic fracturing microseism monitoring.

Description

technical field [0001] The invention belongs to the technical field of applied geophysics, and in particular relates to a method for determining the effective monitoring distance of hydraulic fracturing microseismic in coal mines. Background technique [0002] Microseismic monitoring technology is widely used in oil, natural gas, shale gas, coalbed methane, carbon dioxide storage, mining and other underground projects. Its main purpose is to monitor the fracture and fracture propagation behavior of reservoir stimulation. Undoubtedly, underground gas in coal mines has become a kind of energy and is an important part of natural gas. Hydraulic fracturing technology can effectively increase the air permeability of coal seams and promote efficient gas extraction. The promotion of hydraulic fracturing technology in coal mines requires the implementation of microseismic monitoring in coal mines. [0003] At present, the microseismic monitoring of hydraulic fracturing in coal mine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/20G01V1/16G01V1/30
CPCG01V1/288G01V1/20G01V1/168G01V1/307G01V1/306G01V2210/144G01V2210/1429G01V2210/63G01V2210/62
Inventor 李全贵姜志忠胡千庭凌发平吴燕清许洋铖宋明洋胡良平张跃兵刘乐
Owner CHONGQING UNIV
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