液氮冷沖擊作用下煤層氣儲(chǔ)層的裂隙演化(英文)
發(fā)布時(shí)間:2021-01-28 06:08
當(dāng)煤層氣儲(chǔ)層遇到溫度極低的液氮時(shí),會(huì)發(fā)生冷沖擊效應(yīng)。本文利用三維X射線顯微成像系統(tǒng)和掃描電鏡對(duì)液氮冷沖擊引起的煤樣裂隙形態(tài)演化特征開展可視化和量化分析。在液氮冷沖擊作用后煤樣裂隙網(wǎng)絡(luò)比初始狀態(tài)致密,孔隙率增加了183.3%;煤樣CT掃描層表面孔隙率在液氮冷沖擊影響下增加18.76%~215.11%,說明了液氮冷沖擊后煤樣變形的非均質(zhì)性。液氮冷沖擊作用,總體上對(duì)低表面孔隙率比高表面孔隙率掃描層致裂的效果更顯著,這表明液氮冷沖擊對(duì)低滲煤層氣儲(chǔ)層增產(chǎn)的適用性。液氮冷沖擊前、后煤粉和煤塊的電鏡掃描實(shí)驗(yàn)發(fā)現(xiàn),煤基質(zhì)呈現(xiàn)大量深淺遞進(jìn)分層擦痕特征以及煤塊表面裂隙變化的多樣性,如擴(kuò)展、產(chǎn)生、連通和不規(guī)則,這是導(dǎo)致液氮冷沖擊后煤樣單軸抗壓強(qiáng)度降低的主要原因。
【文章來源】:Journal of Central South University. 2020,27(06)
【文章頁數(shù)】:15 頁
【文章目錄】:
1 Introduction
2 Equipment and testing process
3 Results and analysis
3.1 Pore spatial evolution characteristics of coal specimen before and after LN2 thermal shocking
3.2 Porosity change characteristics for each layer suffering from LN2
3.3 Pore change characteristics of single scanned layer comparison before and after LN2 thermal shocking
3.3.1 CT Scanning porosity calculation
3.3.2 Relationship between original surface porosity and LN2 thermal shocking effect
3.4 Relation between coal strength and LN2thermal shocking
4 Conclusions
【參考文獻(xiàn)】:
期刊論文
[1]基于實(shí)驗(yàn)與案例分析的蓋層封蓋能力對(duì)煤層氣保存的影響(英文)[J]. 田富超,梁運(yùn)濤,王德明,金侃. Journal of Central South University. 2019(04)
[2]裂隙(孔隙)水凍結(jié)過程中巖石細(xì)觀結(jié)構(gòu)變化的實(shí)驗(yàn)研究[J]. 劉慧,楊更社,賈海梁,葉萬軍,魏堯,奚家米,申艷軍,張慧梅. 巖石力學(xué)與工程學(xué)報(bào). 2016(12)
[3]煤塊抗拉強(qiáng)度的套筒致裂法實(shí)驗(yàn)室測定[J]. 吳基文,樊成. 煤田地質(zhì)與勘探. 2003(01)
[4]煤的直接單軸拉伸特性的試驗(yàn)研究[J]. 齊慶新. 煤礦開采. 2001(04)
本文編號(hào):3004489
【文章來源】:Journal of Central South University. 2020,27(06)
【文章頁數(shù)】:15 頁
【文章目錄】:
1 Introduction
2 Equipment and testing process
3 Results and analysis
3.1 Pore spatial evolution characteristics of coal specimen before and after LN2 thermal shocking
3.2 Porosity change characteristics for each layer suffering from LN2
3.3 Pore change characteristics of single scanned layer comparison before and after LN2 thermal shocking
3.3.1 CT Scanning porosity calculation
3.3.2 Relationship between original surface porosity and LN2 thermal shocking effect
3.4 Relation between coal strength and LN2thermal shocking
4 Conclusions
【參考文獻(xiàn)】:
期刊論文
[1]基于實(shí)驗(yàn)與案例分析的蓋層封蓋能力對(duì)煤層氣保存的影響(英文)[J]. 田富超,梁運(yùn)濤,王德明,金侃. Journal of Central South University. 2019(04)
[2]裂隙(孔隙)水凍結(jié)過程中巖石細(xì)觀結(jié)構(gòu)變化的實(shí)驗(yàn)研究[J]. 劉慧,楊更社,賈海梁,葉萬軍,魏堯,奚家米,申艷軍,張慧梅. 巖石力學(xué)與工程學(xué)報(bào). 2016(12)
[3]煤塊抗拉強(qiáng)度的套筒致裂法實(shí)驗(yàn)室測定[J]. 吳基文,樊成. 煤田地質(zhì)與勘探. 2003(01)
[4]煤的直接單軸拉伸特性的試驗(yàn)研究[J]. 齊慶新. 煤礦開采. 2001(04)
本文編號(hào):3004489
本文鏈接:http://sikaile.net/kejilunwen/shiyounenyuanlunwen/3004489.html
最近更新
教材專著