基于压汞试验的煤可压缩性研究及压缩量校正

发布时间：2018-06-07 11:36

本文选题：孔隙结构 + 压汞试验　；参考：《煤炭科学技术》2015年03期

【摘要】：为了提高压汞试验结果的可靠性和适用性,以准确表征煤的孔隙结构,根据弹性力学基本原理,结合分形分维的思想,在10~206 MPa压力范围内,基于压汞数据计算了煤基质的压缩系数,并结合液氮吸附数据对压汞试验结果进行校正。得到煤样的基质压缩系数在0.671×10-10~1.23×10-10m2/N,校正后总孔容与校正前相差48.62%~54.89%,孔隙结构与液氮吸附试验结果更加接近。压力大于206 MPa时煤的孔隙结构变化十分复杂,对应孔径小于6 nm的测试结果不宜采用。压力在10~206 MPa时,累计压缩量与填充量呈幂函数关系。
[Abstract]:In order to improve the reliability and applicability of mercury injection test results and accurately characterize the pore structure of coal, according to the basic principles of elasticity and fractal dimension, in the pressure range of 10 ~ 206 MPa, The compression coefficient of coal matrix was calculated based on mercury injection data, and the results of mercury injection test were corrected with liquid nitrogen adsorption data. The matrix compression coefficient of coal sample is 0.671 脳 10 ~ (-10) ~ (-1) 脳 10 ~ (-10) m ~ (2 / N), the difference of total pore volume after correction is 48.62% ~ 54.89, and the pore structure is closer to the result of liquid nitrogen adsorption test. The change of pore structure of coal is very complicated when the pressure is more than 206 MPa, so it is not suitable to use the test results of pore diameter less than 6 nm. When the pressure is 10 ~ 206 MPa, the relationship between the cumulative compression and the filling is a power function.
【作者单位】：中国矿业大学煤层气资源与成藏过程教育部重点实验室;中国石油华北油田公司勘探开发研究院;
【基金】：国家自然科学联合基金重点资助项目(U1361207) 国家科技重大专项资助项目(2011ZX05033)
【分类号】：TD712

【相似文献】