基于渗流特性的型煤制备实验研究与评价

发布时间：2018-05-06 16:08

  本文选题：型煤制备 + 变形特征　； 参考：《太原理工大学》2017年硕士论文

【摘要】：在我国,煤层气资源十分丰富,通过研究煤储层渗流特性从而提高煤层气的产量成为我国现有实验研究的必要途径。然而,大部分煤层的裂隙结构、层理和节理发育明显,造成钻取原煤的成功率降低,阻碍了实验室的相关研究。因此,通过型煤试件代替原煤可解决实验中存在的障碍,但前提是减小型煤试件与原煤试件在渗流特性中的差异。本文研究为实验室型煤的制备方法提供一定的指导与依据。本文以大同煤矿集团有限责任公司晋华宫矿10号煤层的煤样为研究对象,使用WYS-800微机控制电液伺服三轴瓦斯渗流试验装置进行常规三轴压缩试验,对比分析不同制备过程的型煤试件与原煤试件的渗流特性,其实验结论如下:(1)钠基膨润土做粘结剂时,增加粘结剂含量,峰值偏应力、弹性模量先增加后减小,起始渗透率和最低渗透率逐渐降低。粘结剂含量7%时,其抗压强度、泊松比与原煤接近,但弹性模量相差较大,渗透率的变化与原煤最为接近。粘结剂含量相同时,烘干温度增加,抗压强度增加,渗透率逐渐增大,烘干温度105℃时,渗流特性与原煤最为接近。对试件进行余弦相似性度量分析,由分析结果可知,钠基膨润土粘结剂含量7%,烘干温度105℃时,型煤试件的计算结果最大,与原煤最为接近。(2)水泥做粘结剂时,增加粘结剂含量,峰值偏应力增加,弹性模量增加,起始渗透率和最低渗透率逐渐降低。粘结剂含量20%时,抗压强度、泊松比、弹性模量以及渗透率的变化都与原煤较为接近。改变煤粉粒径时,80-100目煤粉粒径的型煤试件与原煤渗流特性较为接近,试验中其余目数型煤试件的渗透率远大于原煤的渗透率,对其进行余弦相似性度量分析,水泥粘结剂含量20%,煤粉粒径80-100目时,型煤试件的计算结果最大,与原煤最为接近。(3)聚醋酸乙烯乳液做粘结剂时,增加粘结剂含量,峰值偏应力增加,起始渗透率和最低渗透率逐渐降低。粘结剂含量7%时,其抗压强度、泊松比、弹性模量、渗透率变化与原煤较为接近。增加烘干温度,峰值偏应力增加,起始渗透率和最低渗透率逐渐增加,烘干温度90℃时,渗流特性效果较好。水胶比1:2时,起始渗透率和最低渗透率大于水胶比1:1的型煤试件。成型压力增加,起始渗透率和最低渗透率降低。成型压力40MPa时,弹性模量、泊松比、抗压强度,渗透率变化与原煤较为接近。对试件进行余弦相似性度量分析时,聚醋酸乙烯乳液粘结剂含量7%,烘干温度90℃,成型压力45MPa,水胶比1:2,粉煤粒径80-100目时,型煤试件的计算结果最大,且值大于钠基膨润土粘结剂型煤试件、水泥粘结剂型煤试件的计算值,变形特征和渗流特性与原煤最为接近,计算结果为0.991。
[Abstract]:In China, the coal bed methane resources are very rich. It is necessary to study the percolation characteristics of coal reservoir to improve the coal bed methane production. However, the fracture structure, bedding and joint development of most coal beds are obvious, which results in the decrease of the success rate of drilling raw coal and hinders the related research in the laboratory. Therefore, the obstacles in the experiment can be solved by replacing the raw coal with briquette, but the premise is to reduce the difference in seepage characteristics between briquette and raw coal. This paper provides some guidance and basis for the preparation of briquette in laboratory. In this paper, the coal sample of No. 10 coal seam in Jinhuagong Coal Mine of Datong Coal Mine Group Co., Ltd. is studied. The conventional triaxial compression test is carried out with WYS-800 microcomputer controlled electro-hydraulic servo triaxial gas seepage test device. The percolation characteristics of briquette samples and raw coal samples in different preparation processes are analyzed. The experimental results are as follows: when sodium bentonite is used as binder, the content of binder increases, the peak deflection stress and elastic modulus increase first and then decrease. The initial permeability and the minimum permeability gradually decrease. When the binder content is 7, the compressive strength and Poisson's ratio are close to the raw coal, but the modulus of elasticity is quite different, and the change of permeability is the most close to that of the raw coal. When the binder content is the same, the drying temperature increases, the compressive strength increases, and the permeability increases gradually. At the drying temperature of 105 鈩，

本文编号：1852973