Borehole Accurate Measurement System for Small Flow Gas Drainage

Abstract

The invention discloses a small-flow gas drainage drilling precision measurement system, which belongs to the technical field of coal mine gas mining; the system can enhance the drainage and slag removal effect of the single-hole metering system, and realize accurate measurement of low-flow drilling holes; the technical solution is: the system includes The drainage main pipe and the drainage branch pipe are connected to each other, and the drainage branch pipe is equipped with a measuring pipeline, which is used when the drainage flow rate is 0.001 ~ 0.1m 3 / min low-flow gas measurement, the measurement pipeline includes the first valve, the second valve, the third valve, drainage slag remover and flow meter, the third valve is set on the drainage branch road, located between the first valve and the second valve After the third valve is closed, the gas, water, and cinder mixture in the extraction branch pipe pass through the first valve and the drainage deslagging device sequentially through the pipeline, and the gas mixture flows out from the outlet of the drainage deslagging device through the flow meter. After measurement, it flows into the extraction branch pipe through the pipeline through the second valve.

Description

technical field [0001] The invention discloses a small-flow drainage drilling precision measurement system, which belongs to the technical field of coal mine gas mining. Background technique [0002] At present, the underground gas drainage pipelines in coal mines have realized electronic automatic monitoring and measurement, with large pipeline flow and small errors. For gas single hole flow rate at 0.1m 3 For boreholes above / min, single hole measurement is generally measured with an orifice plate flowmeter connected to a portable measuring instrument, or the average value method can be used to measure the data of a large unit through an automatic metering system to obtain single hole flow data. However, for a single borehole that requires key monitoring for low-flow gas, that is, the drainage volume is between 0.001 and 0.1m 3 / min, the existing electronic instruments all have large errors. The mechanical flow meter is used for direct measurement, which is greatly affe...

AI Technical Summary

Problems solved by technology

However, for a single borehole that requires key monitoring for low-flow gas, that is, the drainage volume is between 0.001 and 0.1m 3 / min, the existing electronic instruments all have large errors

Using a mechanical flow meter for direct measurement is greatly affected by drilling water, coal slag, etc., resulting in failure of the mechanical flow meter

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