水对天然气中微量氢同位素测试结果的影响

STUDY ON THE INFLUENCE OF WATER VAPOR TO THE MEASUREMENT OF TRACE HYDROGEN IN NATURAL GAS

孟庆强 金之钧 刘文汇 陶成 孙冬胜

Meng Qingqiang Jin Zhijun Liu Wenhui Tao Cheng Sun Dongsheng

中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083 2. 中国地质大学(北京)能源学院, 北京, 100083 3. 中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151

Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 2. School of Energy Resource, China University of Geosciences, Beijing 100083, China 3. Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

利用饱和食盐水进样测试微量氢的同位素组成时,水蒸气对氢同位素组成具有较大影响。实验结果表明,不对色谱柱进行除水时,浓度为0.1%的氢,其6次的同位素组成测试值的标准偏差为17.15,表明尽管测试值的平均值与内标氢同位素组成的公认值之间的差较小,但单次测试结果的可信度较低;而对色谱柱除水后,相同浓度氢同位素组成的6次测试值的标准偏差为4.56,说明色谱柱除水之后,测试值的分布相对集中。研究表明,色谱柱除水能显著提高测试结果的可信度,并且,低浓度氢的氢同位素组成的测试平均值并不能完全代表测试结果的质量,应综合考虑标准偏差参数对测试值进行评价。

The water vapor can affect the measuring result of the hydrogen isotopic composition which was attained by improved measuring method for trace hydrogen.It was proved by experiments that standard deviation was 17.15 for 6 measured results of trace hydrogen,whose content was 0.1% before the chromatographic column was heated to remove the water vapor,it was suggested that although the measured result had an average which was similar to the generally accepted value for the employed hydrogen in the experiment,the measured result had a wide distribution range and each single measured result had a relatively weak reliability.After the chromatographic column was heated to remove the water vapor,the 6 measured results for the same sample had a standard deviation of 4.56,which suggested that the measured results were relatively concentric.It was safely to conclude that heating the chromatographic column can significantly improve the reliability of the measured result.What's more,the average value could not be used as the real isotopic composition for lower content hydrogen gas,the measured result should be assessed taking the standard deviation value into account.

中国石油化工股份有限公司科技开发部项目(G5800-07-ZS-HX044-1);国家重大专项(2008ZX05002)联合资助

https://doi.org/10.11781/sysydz201001098