Continuous drilling flowrate process capable of predicting coal draft outburst and its apparatus

Abstract

The continuous drilling flow method and its device for predicting coal roadway outburst adopt the method of drilling holes along the coal seam drilling direction to collect data, and use a capsule hole sealing device, a solid-gas separator, a filter, a coal chip controller, and a displacement The device composed of the rock electric drill with sensor LXC, the control host KZ with explosion-proof casing and the computer data collector SC connected to it can measure the coal seam during the drilling process and the gas emission with the drilling distance. According to the distribution of the gas flow along the depth of the borehole, the distribution curve of the gas flow along the depth of the borehole can be obtained, so as to judge how far the soft coal containing high-pressure gas is from the working face, so as to judge whether the coal roadway will protrude during the excavation process or the coal roadway can move forward safely No matter how far it advances without protrusion, the range of gas flow measured by the main engine is 0-1020 liters per minute, and the range of drill bit displacement is 0-2.0 meters each time. It has a compact and reasonable structure, high accuracy, and stable and reliable measurement results. Has a wide range of practicability.

Description

technical field [0001] The invention relates to a continuous drilling flow rate method and a device thereof for predicting coal roadway outburst, and is especially suitable for measuring the risk of coal roadway outburst. Background technique [0002] As we all know, coal and gas outburst is a dynamic phenomenon that occurs in soft coal containing high-pressure gas. Once outburst occurs, it often endangers the lives of coal miners. Coal roadway excavation is a labor process carried out in soft coal seams, and coal and gas outbursts are often encountered. It is very important to predict coal roadway outbursts to avoid outburst hazards. At present, the coal roadway outburst prediction methods commonly used in the underground are: 1) the initial velocity method of drilling gas emission; 2) the R value index method; 3) the cuttings index method. The characteristic of these methods is to measure the index of a certain point in front of the coal roadway working face by drilling a...

AI Technical Summary

Problems solved by technology

Although these methods have a certain reference value, they are not accurate, and some cases even have low indicators and outstanding cases, causing serious casualties and causing serious psychological panic to the workers who went down the well.

The results measured by these "point prediction" methods cannot reflect the actual distribution of the pressure relief zone in front of the working face of the coal roadway, and thus cannot accurately predict the outburst danger of the working face of the coal roadway. Domestic scholars have also provided a set of continuous measurement coal roadway There are similar prediction devices for parameters such as cuttings volume, drilling power, cuttings gas flow rate, and gas concentration during the drilling process of the working face, but there is no device for directly measuring the gas flow distribution during continuous drilling.

Images