淮南潘集深部瓦斯吸附解吸实验研究

发布时间：2018-06-05 23:40

本文选题：潘集深部煤层 + 瓦斯　；参考：《安徽理工大学》2017年硕士论文

【摘要】：本文通过对潘集深部钻孔煤样进行现场地勘钻孔瓦斯解吸实验和室内等温吸附解吸实验,基于现场测试数据,采用地勘直线法、泥浆介质法、间接法、不同函数拟合等分析方法,计算了不同方法下的煤层瓦斯损失量,并对深部瓦斯计算方法进行了对比分析。在对潘集深部煤层煤样现场解吸时,采用煤储层温度条件下煤样解吸规律推算出的瓦斯损失量更接近实际量。采用泥浆介质法校正计算出的瓦斯含量与国标法计算出的瓦斯含量相比相差不大,而采用间接法推算出的瓦斯含量结果与国标法推算出的瓦斯含量相比相差较大,计算结果仅能作为参考。在利用不同函数拟合计算瓦斯损失量时,直线法受煤芯取样时间的影响最大,且煤芯地勘解吸法采用初期15min的5个左右数据点进行计算,其受装罐后初次读数时间的影响大,而15min后的读数对损失量的计算无关,数据受现场的解吸条件影响大;采用对数法及兰式方程拟合,能更好地反映瓦斯解吸特征。延长现场解析时间,有助于提高两种方法的计算精度。对数法在提钻时间相对较长时,损失量精度高于直线法。但随着解吸时间的增加,其模拟数据与实际解吸数据的偏差和直线法一样,偏差愈来愈大,理论上当解吸时间为无限大时,其计算解吸量无穷大,因此无法预测极限解吸量。而采用兰式方程拟合,其拟合数据与实际解吸的数据误差相对较小,而且利用拟合计算极限解吸量与损失量的差值可以与实验室的残余量进行互为验证。
[Abstract]:In this paper, gas desorption experiments and isothermal adsorption desorption experiments are carried out on the coal samples of deep boreholes in Panji. Based on the field test data, the methods of geological prospecting, mud medium and indirect methods are used. Different function fitting and other analysis methods are used to calculate the amount of coal seam gas loss under different methods, and the deep gas calculation methods are compared and analyzed. In the desorption of coal samples from deep coal seams in Panji, the amount of gas loss calculated by using the desorption law of coal samples under the conditions of coal reservoir temperature is closer to the actual amount. The gas content calculated by mud medium method is similar to that calculated by national standard method, but the gas content calculated by indirect method is quite different from that calculated by national standard method. The calculated results can only be used as a reference. In the calculation of gas loss by using different function fitting, the linear method is most affected by the sampling time of coal core, and the coal core geological prospecting and desorption method is calculated by 5 or so data points of 15min in the initial period, which has a great influence on the first reading time after filling tank. But the reading after 15min has nothing to do with the calculation of the loss, and the data is greatly affected by the desorption condition in the field, and the logarithmic method and the blue equation fitting can better reflect the characteristics of gas desorption. Prolonging the time of field analysis is helpful to improve the accuracy of the two methods. The loss accuracy of logarithmic method is higher than that of straight line method when the lifting time is relatively long. However, with the increase of desorption time, the deviation between the simulated data and the actual desorption data is more and more large as the linear method. Theoretically, when the desorption time is infinite, the calculated desorption capacity is infinite, so the limit desorption can not be predicted. By using the blue equation, the error between the fitting data and the actual desorption data is relatively small, and the difference between the limit desorption amount and the loss amount can be verified by fitting.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712

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