当前位置：
X-MOL 学术
›
Energy Fuels
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Pore-Microfracture Structure Alteration of Coal Induced by High-Pressure CO2 Gas Fracturing
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-22 , DOI: 10.1021/acs.energyfuels.2c04131 Shuaifang Guo 1 , Yunxing Cao 1, 2, 3, 4, 5 , Junsheng Zhang 1, 4 , Xinsheng Zhang 1 , Bingbing Meng 1 , Shimin Liu 6
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-22 , DOI: 10.1021/acs.energyfuels.2c04131 Shuaifang Guo 1 , Yunxing Cao 1, 2, 3, 4, 5 , Junsheng Zhang 1, 4 , Xinsheng Zhang 1 , Bingbing Meng 1 , Shimin Liu 6
Affiliation
|
High-pressure CO2 gas fracturing (CO2-Frac) is a novel technology to stimulate coal for improving coal-seam permeability and increase gas extraction efficiency. However, the multiscale pore-microfracture evolution characteristics induced by CO2-Frac and its damage mechanism are still in their nascency. Herein, a high-pressure CO2-Frac system of 120–150 MPa was newly developed and carried out on anthracite coal to reveal the damage mechanism. The results of mercury intrusion porosimetry and field emission scanning electron microscopy (FESEM) tests on coal before and after the impact showed that the micropores (<10 nm) and transition pores (10–100 nm) were significantly reduced after CO2-Frac; the volume and specific surface area of seepage pores (large pores, 1000–10,000 nm) increased significantly. The FESEM images show four damage structures including (1) damage marks, (2) tri-wing fractures, (3) pore-microfracture linkage structures, and (4) zigzag fractures. Based on these new findings, a two-stage damage mechanism was proposed as a high-pressure CO2 damage mechanism and a low-pressure quasi-static CO2 damage mechanism.
中文翻译：
高压CO2气体压裂对煤岩孔微裂缝结构的改造
高压CO 2气体压裂(CO 2 -Frac)是一种提高煤层渗透率、提高瓦斯抽采效率的煤增产新技术。然而，CO 2 -Frac诱发的多尺度孔隙-微裂缝演化特征及其破坏机制仍处于初级阶段。在此，新开发了一种120-150 MPa 的高压CO 2 -Frac 系统，并在无烟煤上进行，以揭示破坏机理。冲击前后煤的压汞孔隙度法和场发射扫描电子显微镜（FESEM）测试结果表明，CO 2 作用后微孔（<10 nm）和过渡孔（10~100 nm）显着减少- 压裂；渗孔（大孔，1000～10000 nm）体积和比表面积显着增加。FESEM 图像显示四种损伤结构，包括 (1) 损伤痕迹、(2) 三翼断裂、(3) 孔隙-微裂缝连接结构和 (4) 之字形断裂。基于这些新发现，提出了一种两阶段损伤机制，即高压CO 2损伤机制和低压准静态CO 2损伤机制。
更新日期：2023-02-22
中文翻译：
高压CO2气体压裂对煤岩孔微裂缝结构的改造
高压CO 2气体压裂(CO 2 -Frac)是一种提高煤层渗透率、提高瓦斯抽采效率的煤增产新技术。然而，CO 2 -Frac诱发的多尺度孔隙-微裂缝演化特征及其破坏机制仍处于初级阶段。在此，新开发了一种120-150 MPa 的高压CO 2 -Frac 系统，并在无烟煤上进行，以揭示破坏机理。冲击前后煤的压汞孔隙度法和场发射扫描电子显微镜（FESEM）测试结果表明，CO 2 作用后微孔（<10 nm）和过渡孔（10~100 nm）显着减少- 压裂；渗孔（大孔，1000～10000 nm）体积和比表面积显着增加。FESEM 图像显示四种损伤结构，包括 (1) 损伤痕迹、(2) 三翼断裂、(3) 孔隙-微裂缝连接结构和 (4) 之字形断裂。基于这些新发现，提出了一种两阶段损伤机制，即高压CO 2损伤机制和低压准静态CO 2损伤机制。
京公网安备 11010802027423号