【摘要】：解吸法測定煤層瓦斯含量時,煤層瓦斯含量測定的誤差主要來源瓦斯損失量。目前瓦斯損失量計算方法建立的是瓦斯解吸參數(shù)與時間之間的關(guān)系,各方法計算結(jié)果都會受到時間因素的影響。本文以瓦斯損失量計算方法為研究核心,以準確、快速測定煤層瓦斯含量為目的,采用理論、實驗和現(xiàn)場相結(jié)合的研究方法,對瓦斯損失量計算方法進行了深入研究。以瓦斯吸附一解吸理論為基礎(chǔ),在實驗室模擬了煤的瓦斯自然解吸過程,通過對實驗數(shù)據(jù)的對比分析得出了瓦斯吸附平衡壓力、煤的粒度和硬度對瓦斯解吸的影響規(guī)律。基于實驗解吸數(shù)據(jù),在時間因素上對目前瓦斯損失量計算方法進行了分析。其中,選取的解吸初期測點個數(shù)越多,各計算方法瓦斯損失量推算值越小;取樣時間越長,各計算方法推算值與真實值差值的絕對值越大,所占煤層瓦斯含量的比重越大,增大了煤層瓦斯含量的測定誤差;讀數(shù)間隔對計算結(jié)果也會產(chǎn)生影響,但是影響效果不顯著。煤樣相同時,不同吸附平衡壓力下的瓦斯解吸曲線形狀相同,從側(cè)面說明了同種煤樣在不同吸附平衡壓力下的瓦斯解吸規(guī)律符合同一個函數(shù)類型,只不過是不同吸附平衡壓力下的擬合參數(shù)各不相同而已。基于這一結(jié)論和相關(guān)分析理論,提出了一種不受時間因素影響和符合實際的瓦斯損失量計算新方法:利用時序數(shù)據(jù)匹配模型來推算瓦斯損失量�；诮⒌臄�(shù)據(jù)匹配模型,將井下數(shù)據(jù)與實驗室數(shù)據(jù)進行匹配,在實驗室數(shù)據(jù)中找到與井下數(shù)據(jù)相匹配的解吸數(shù)據(jù),擬合出兩組數(shù)據(jù)之間的關(guān)系,結(jié)合現(xiàn)場取樣時間,可以反推瓦斯損失量。該計算方法得到了現(xiàn)場驗證,計算結(jié)果可靠。
[Abstract]:When desorption method is used to measure coal seam gas content, the error of coal seam gas content measurement is mainly caused by gas loss. At present, the calculation method of gas loss is based on the relationship between the parameters of gas desorption and time, and the results of each method will be affected by the time factor. In this paper, the calculation method of gas loss is taken as the core of the research, and the method of calculating the amount of gas loss is deeply studied by using the research method of combining theory, experiment and field with the purpose of accurate and rapid determination of gas content in coal seam. Based on the theory of gas adsorption-desorption, the natural desorption process of coal is simulated in the laboratory. The influence of gas adsorption equilibrium pressure, coal particle size and hardness on gas desorption is obtained by comparing and analyzing the experimental data. Based on the experimental desorption data, the current calculation methods of gas loss are analyzed in terms of time factors. Among them, the more the number of desorption points selected, the smaller the calculated value of gas loss, the longer the sampling time, the greater the absolute value of the difference between the calculated value and the real value, the greater the proportion of gas content in coal seam. The measurement error of coal seam gas content is increased, and the reading interval also affects the calculation results, but the effect is not significant. When the coal sample is the same, the gas desorption curve under different adsorption equilibrium pressure is the same, which shows that the law of gas desorption of the same coal sample under different adsorption equilibrium pressure accords with the same function type. It is only that the fitting parameters are different under different adsorption equilibrium pressures. Based on this conclusion and related analysis theory, a new method for calculating gas loss is proposed, which is not affected by time factors and is in line with the actual situation. The method is to calculate the amount of gas loss by using the matching model of time series data. Based on the established data matching model, the underground data and the laboratory data are matched, the desorption data matching with the underground data is found in the laboratory data, the relationship between the two groups of data is fitted, and the sampling time in the field is combined. The amount of gas loss can be pushed back. The method is verified in the field and the result is reliable.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD712.3

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