不同温度条件下气体压力升降过程中瓦斯运移规律的试验研究
发布时间：2018-11-19 09:01
【摘要】：利用自主研发的含瓦斯煤热-流-固耦合三轴伺服渗流装置,对不同温度条件下型煤试件在气体压力升降过程的渗流特性进行了试验研究,以模拟随采深增加引起的地温升高条件下煤的渗透特性。同时,为探讨低渗储层的滑脱效应进行了相同条件下氦气的平行试验。研究结果表明:(1)升压阶段,轴向应变增大,径向应变减小,近似呈线性变化;降压阶段,随气体压力降低,应变呈现出与升压阶段相同的变化趋势。随温度升高,应变随气体压力变化的斜率增大。(2)升压阶段,随气体压力升高,渗透率呈二次抛物线型变化,约在气体压力为3.0 MPa左右到达最小;降压阶段,随气体压力减小,渗透率先略有减小后增大,升压阶段渗透率大于降压阶段渗透率。(3)升压阶段滑脱效应引起的渗透率变化量大于降压阶段的变化量,且滑脱效应所引起的渗透率变化量随气体压力增加呈幂指数函数降低。
[Abstract]:In this paper, the seepage characteristics of briquette specimens under different temperature conditions in the process of gas pressure rise and fall are studied by using the gas-bearing coal thermo-fluid-solid coupling three-axis servo percolation device developed by ourselves. The permeability characteristics of coal under the condition of increasing ground temperature caused by the increase of mining depth are simulated. At the same time, parallel experiments of helium gas under the same conditions were carried out to study the slippage effect of low permeability reservoirs. The results show that: (1) the axial strain increases and the radial strain decreases approximately linearly at the stage of pressurization, and the strain shows the same trend with the decrease of the pressure of the gas at the stage of lowering the pressure. With the increase of temperature, the slope of strain varies with the gas pressure. (2) in the stage of rising pressure, the permeability of the gas increases with the increase of the gas pressure, and the permeability changes in the form of a quadratic parabola, which reaches the minimum at about 3. 0 MPa of the gas pressure. At the stage of lowering pressure, the permeability decreases slightly and then increases with the decrease of gas pressure, and the permeability in booster stage is larger than that in the stage of pressure lowering. (3) the variation of permeability caused by slippage effect in booster stage is greater than that in the stage of lowering pressure. The change of permeability caused by slippage effect decreases with the increase of gas pressure as a power exponential function.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点试验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程试验室;
【基金】：国家自然科学基金(No.51474040);国家自然科学基金(No.51434003);国家自然科学基金(No.51304255) 重庆市基础与前沿研究计划项目(No.cstc2013jj B90001)~~
【分类号】：TD712
本文编号：2341801
[Abstract]:In this paper, the seepage characteristics of briquette specimens under different temperature conditions in the process of gas pressure rise and fall are studied by using the gas-bearing coal thermo-fluid-solid coupling three-axis servo percolation device developed by ourselves. The permeability characteristics of coal under the condition of increasing ground temperature caused by the increase of mining depth are simulated. At the same time, parallel experiments of helium gas under the same conditions were carried out to study the slippage effect of low permeability reservoirs. The results show that: (1) the axial strain increases and the radial strain decreases approximately linearly at the stage of pressurization, and the strain shows the same trend with the decrease of the pressure of the gas at the stage of lowering the pressure. With the increase of temperature, the slope of strain varies with the gas pressure. (2) in the stage of rising pressure, the permeability of the gas increases with the increase of the gas pressure, and the permeability changes in the form of a quadratic parabola, which reaches the minimum at about 3. 0 MPa of the gas pressure. At the stage of lowering pressure, the permeability decreases slightly and then increases with the decrease of gas pressure, and the permeability in booster stage is larger than that in the stage of pressure lowering. (3) the variation of permeability caused by slippage effect in booster stage is greater than that in the stage of lowering pressure. The change of permeability caused by slippage effect decreases with the increase of gas pressure as a power exponential function.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点试验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程试验室;
【基金】：国家自然科学基金(No.51474040);国家自然科学基金(No.51434003);国家自然科学基金(No.51304255) 重庆市基础与前沿研究计划项目(No.cstc2013jj B90001)~~
【分类号】：TD712
【相似文献】
相关硕士学位论文 前1条
1 张敏;气体压力升降过程含瓦斯煤变形与渗流规律及其影响因素的试验研究[D];重庆大学;2014年
，本文编号：2341801
本文链接：https://www.wllwen.com/kejilunwen/anquangongcheng/2341801.html
