Real-time rapid monitoring and evaluating method for coal and rock mass fracturing fractures by utilizing micro-seismic signals

Abstract

The invention discloses a real-time rapid monitoring and evaluating method for coal and rock mass fracturing fractures by utilizing microseismic signals. The method comprises steps firstly, calculating microseismic waveform characteristic parameters such as the channel average waveform number, a time window maximum amplitude sum, the channel average pulse number, the time window waveform average duration time and the time window waveform average main frequency in any time window, on the basis, respectively obtaining curves, curves, curves, curves and curves, monitoring and evaluating the crackinitiation, expansion, penetration and branch crack initiation of coal and rock mass fracturing main cracks according to the magnitude of a vertical coordinate value of the curve and a change trend of the curve, needing no complex micro-seismic positioning and seismic source mechanism inversion calculation. The method is simple in operation and small in calculation amount, can achieve real-time rapid monitoring and evaluation of coal and rock mass fracturing crack initiation, expansion and penetration, greatly reduces complexity, the time and economic cost of traditional coal and rock mass fracturing micro-seismic monitoring, and is of great significance to real-time adjustment of fracturing parameters in the coal and rock mass fracturing scheme design and implementation process.

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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