本文選題：煤層氣 + 二氧化碳�。� 參考：《太原理工大學(xué)》2013年碩士論文

【摘要】：煤層氣是一種自生自?xún)?chǔ)的非常規(guī)天然氣,是近30年來(lái)新興的、蘊(yùn)藏量巨大的潛在能源之一。我國(guó)的煤層氣資源十分豐富,但由于煤層滲透率普遍低于工業(yè)化開(kāi)采條件,常規(guī)開(kāi)采方法在國(guó)內(nèi)的應(yīng)用受到限制。針對(duì)我國(guó)煤層自身特點(diǎn),建議采用二氧化碳驅(qū)替煤層瓦斯技術(shù),以提高煤層氣的采收率,同時(shí)可將二氧化碳儲(chǔ)存于煤層中,減少對(duì)大氣的污染。 本文首先研究與總結(jié)了氣體在煤層中的吸附、解吸以及運(yùn)移機(jī)理,分析了溫度、體積應(yīng)力、氣體壓力對(duì)氣體儲(chǔ)存與運(yùn)移的影響,對(duì)二氧化碳與甲烷在煤層中的置換、驅(qū)替過(guò)程進(jìn)行了理論研究。在此基礎(chǔ)上,使用大尺寸(100mm X100mm X200mm)貧瘦煤試件,進(jìn)行了擬靜水壓力下滲透率測(cè)定試驗(yàn)與二氧化碳驅(qū)替甲烷試驗(yàn)研究。 滲透試驗(yàn)結(jié)果表明：室溫條件下,氣體在煤體中的滲透率受靜水壓力與滲透壓雙重影響。煤體處于靜水壓力環(huán)境時(shí),其內(nèi)部收縮變形比較均勻,未有剪切破壞發(fā)生,其物理特性更接近于各向同性多孔介質(zhì),回歸分析發(fā)現(xiàn),滲透壓力不變時(shí),隨著靜水壓力的增加,滲透率呈現(xiàn)負(fù)指數(shù)規(guī)律衰減,主要由靜水壓力的加載導(dǎo)致煤體的收縮變形作用引起；體積應(yīng)力不變時(shí),隨滲透壓增加滲透率的降低存在最小值,此后隨著滲透壓增大,滲透率開(kāi)始上升。置換與驅(qū)替試驗(yàn)結(jié)果表明：二氧化碳對(duì)貧瘦煤中所吸附甲烷的置換比為1.43-2.17,表現(xiàn)為體積應(yīng)力越小,置換比越高；同時(shí)溫度對(duì)置換過(guò)程有重要影響,溫度越高置換效果越好。在不同體積應(yīng)力與驅(qū)替壓力下,三個(gè)試件中,二氧化碳對(duì)瓦斯的驅(qū)替效率分別為57.1%、40.3%、43.9%,驅(qū)替效率受體積應(yīng)力與驅(qū)替壓力雙重影響,其中體積應(yīng)力下降將導(dǎo)致驅(qū)替效率上升,而驅(qū)替壓力上升將導(dǎo)致驅(qū)替效率下降。同時(shí)與前人工作對(duì)比發(fā)現(xiàn),驅(qū)替壓力對(duì)驅(qū)替效率的影響最為顯著。
[Abstract]:Coal bed methane (CBM) is a self-generated and self-stored unconventional natural gas, which is one of the potential energy sources in recent 30 years. The coal bed methane resources in China are very rich, but because the coal seam permeability is generally lower than the industrial mining condition, the application of conventional mining method in China is limited. According to the characteristics of coal seams in China, it is suggested that carbon dioxide displacement technology should be used to improve the recovery efficiency of coalbed methane and to store carbon dioxide in coal seams to reduce atmospheric pollution. In this paper, the mechanism of gas adsorption, desorption and migration in coal seam is studied and summarized. The effects of temperature, volume stress and gas pressure on gas storage and migration are analyzed, and the displacement of carbon dioxide and methane in coal seam is analyzed. The displacement process is studied theoretically. On this basis, the permeability measurement test and carbon dioxide displacement test of methane under pseudohydrostatic pressure were carried out using the lean coal sample with a large size of 100mm X100mm x 200mm. The results of permeability test show that the permeability of gas in coal is influenced by hydrostatic pressure and osmotic pressure at room temperature. When the coal body is in hydrostatic pressure environment, its internal shrinkage and deformation are more uniform, no shear failure occurs, and its physical characteristics are closer to isotropic porous media. Regression analysis shows that the static water pressure increases with the constant permeation pressure. Permeability shows negative exponential attenuation, which is mainly caused by shrinkage and deformation of coal body caused by hydrostatic pressure. When volume stress is constant, the decrease of permeability is minimum with the increase of osmotic pressure, and then increases with osmotic pressure. The penetration rate began to rise. The results of displacement and displacement tests show that the replacement ratio of carbon dioxide to methane adsorbed in lean coal is 1.43-2.17, which shows that the smaller the volume stress, the higher the displacement ratio, and the more the temperature is, the better the displacement effect is. Under different volume stress and displacement pressure, the displacement efficiency of carbon dioxide to gas is 57.1 / 40.3and 43.9, respectively. The displacement efficiency is affected by volume stress and displacement pressure, and the decrease of volume stress will lead to the increase of displacement efficiency. The displacement efficiency will decrease when the displacement pressure rises. At the same time, it is found that displacement pressure has the most significant effect on displacement efficiency.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TD712.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊起,湯達(dá)禎;華北煤變質(zhì)作用對(duì)煤含氣量和滲透率的影響[J];地球科學(xué);2000年03期

2 唐書(shū)恒,湯達(dá)禎,楊起;二元?dú)怏w等溫吸附實(shí)驗(yàn)及其對(duì)煤層甲烷開(kāi)發(fā)的意義[J];地球科學(xué);2004年02期

3 張時(shí)音;桑樹(shù)勛;;液態(tài)水影響不同煤級(jí)煤吸附甲烷的差異及其機(jī)理[J];地質(zhì)學(xué)報(bào);2008年10期

4 孫培德,凌志儀;三軸應(yīng)力作用下煤滲透率變化規(guī)律實(shí)驗(yàn)[J];重慶大學(xué)學(xué)報(bào)(自然科學(xué)版);2000年S1期

5 孫維吉;梁冰;李輝;白云鵬;蓋迪;;吸附和長(zhǎng)時(shí)間荷載作用煤滲透規(guī)律試驗(yàn)[J];重慶大學(xué)學(xué)報(bào);2011年04期

6 葉建平;張兵;Sam Wong;;山西沁水盆地柿莊北區(qū)塊3#煤層注入埋藏CO_2提高煤層氣采收率試驗(yàn)和評(píng)價(jià)[J];中國(guó)工程科學(xué);2012年02期

7 馮啟言;周來(lái);陳中偉;劉繼山;;煤層處置CO_2的二元?dú)?固耦合數(shù)值模擬[J];高校地質(zhì)學(xué)報(bào);2009年01期

8 韓建光;;中國(guó)煤層氣的開(kāi)發(fā)與利用[J];礦產(chǎn)保護(hù)與利用;2009年04期

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