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直接法测定煤层瓦斯含量中,如何减少或准确推算损失瓦斯量是一个亟待解决的问题。从缩短取样过程中煤样暴露时间角度出发,设计了一种反转密封取样装置,并在祁南煤矿715底板巷24#钻场进行了现场试验。结果表明:该装置能够取到碎屑状煤样,且在取样完成时能够完成对煤样的密封,井下无需转移煤样,直接通过煤样筒利用快接装置进行井下解吸;与传统的岩芯管取芯相比,反转密封取样能够极大缩短取样过程中煤样的暴露时间,井下30 min瓦斯解吸量明显增大,减小了取样过程损失瓦斯量,能够提高直接法测定煤层瓦斯含量的准确性。
How to reduce or accurately calculate the amount of lost gas in coalbed gas content determination by direct method is an urgent problem to be solved. In order to shorten the exposure time of coal samples during the sampling process, an inverted seal sampling device was designed and tested in field at No. 24 # drill ground in 715 bottom lane of Qinan Coal Mine. The results show that the device can take clastic coal samples, and can finish the sealing of the coal samples at the completion of the sampling without transferring the coal samples downhole and directly using the quick release device to conduct the downhole desorption; Compared with the core-tube coring, reverse seal sampling can greatly shorten the exposure time of the coal sample in the sampling process. The desorption amount of gas in the 30-minute well obviously increases, which reduces the amount of gas lost during sampling and can improve the coal gas Content accuracy.