【摘要】：利用自主研發(fā)的含瓦斯煤熱-流-固耦合三軸伺服滲流裝置,對不同溫度條件下型煤試件在氣體壓力升降過程的滲流特性進(jìn)行了試驗(yàn)研究,以模擬隨采深增加引起的地溫升高條件下煤的滲透特性。同時,為探討低滲儲層的滑脫效應(yīng)進(jìn)行了相同條件下氦氣的平行試驗(yàn)。研究結(jié)果表明:(1)升壓階段,軸向應(yīng)變增大,徑向應(yīng)變減小,近似呈線性變化;降壓階段,隨氣體壓力降低,應(yīng)變呈現(xiàn)出與升壓階段相同的變化趨勢。隨溫度升高,應(yīng)變隨氣體壓力變化的斜率增大。(2)升壓階段,隨氣體壓力升高,滲透率呈二次拋物線型變化,約在氣體壓力為3.0 MPa左右到達(dá)最小;降壓階段,隨氣體壓力減小,滲透率先略有減小后增大,升壓階段滲透率大于降壓階段滲透率。(3)升壓階段滑脫效應(yīng)引起的滲透率變化量大于降壓階段的變化量,且滑脫效應(yīng)所引起的滲透率變化量隨氣體壓力增加呈冪指數(shù)函數(shù)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.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動力學(xué)與控制國家重點(diǎn)試驗(yàn)室;重慶大學(xué)復(fù)雜煤氣層瓦斯抽采國家地方聯(lián)合工程試驗(yàn)室;
【基金】：國家自然科學(xué)基金(No.51474040);國家自然科學(xué)基金(No.51434003);國家自然科學(xué)基金(No.51304255) 重慶市基礎(chǔ)與前沿研究計(jì)劃項(xiàng)目(No.cstc2013jj B90001)~~
【分類號】：TD712

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1 張敏;氣體壓力升降過程含瓦斯煤變形與滲流規(guī)律及其影響因素的試驗(yàn)研究[D];重慶大學(xué);2014年

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