A real-time rapid monitoring and evaluation method for fracturing fractures in coal and rock mass using microseismic signals

Abstract

A real-time rapid monitoring and evaluation method for fracturing fractures in coal and rock mass using microseismic signals. First, the average channel waveform number in any time window, the maximum amplitude sum of the time window, the average channel pulse number, the average duration of the time window waveform, and Time window waveform average main frequency and other microseismic waveform characteristic parameters; on this basis, curves, curves, curves, curves and curves are obtained respectively, and then the main fractures of coal and rock mass fracturing are analyzed according to the size of the ordinate value of the above curves and the trend of curve changes. Monitoring and evaluation of crack initiation, expansion, penetration, and branch fracture initiation does not require complicated microseismic positioning and focal mechanism inversion calculations. The method is simple to operate and requires less calculation, and can achieve crack initiation, expansion, and penetration of fractures in coal and rock mass The real-time rapid monitoring and evaluation greatly reduces the complexity, time and economic cost of traditional coal and rock fracturing microseismic monitoring, which is of great significance to the real-time adjustment of fracturing parameters in the design and implementation of coal and rock fracturing schemes.

Description

technical field [0001] The invention belongs to the technical field of fracturing crack monitoring, and relates to the monitoring of coal and rock mass fracturing cracks, in particular to a method for real-time rapid monitoring and evaluation of coal and rock mass fracturing cracks using microseismic signals. Background technique [0002] In recent years, fracturing technology has been widely used in the development of oil and gas and hot dry rock, and the prevention and control of mine dynamic disasters. Fracturing technology continuously injects high-pressure fluid into the coal rock mass through fracturing drilling or boreholes to break the coal rock and generate fracturing fractures; continue to inject high-pressure fluid, and the cracks will expand to the interior of the coal rock mass, forming main cracks and fractures. Crack network system dominated by airfoil branch cracks. Among them, the rapid real-time monitoring and evaluation of fracturing fracture initiation, ...

AI Technical Summary

Problems solved by technology

However, due to the large amount of calculation for microseismic positioning, the theoretical and technical requirements for the monitoring calculation system and practitioners are very high, the monitoring efficiency is low, the monitoring cost is high, and it is difficult to achieve real-time monitoring; more importantly, the fracturing of coal and rock mass Microseismic source location results can only reflect the shape of fractures, and it is difficult to monitor the initiation and expansion process of main fractures and branch fractures in real time.

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