引用本文:曾文平,蒲长胜,王晓琴,张镨,王伟杰,何飞. 天然气中C+6组成分析不同定量方式对计算烃露点的影响[J]. 石油与天然气化工, 2018, 47(6): 80-85, 91.
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天然气中C+6组成分析不同定量方式对计算烃露点的影响
曾文平1,2,蒲长胜1,2,王晓琴1,2,张镨1,2,王伟杰1,2,何飞1
1.中国石油西南油气田公司天然气研究院 ;2.中国石油天然气质量控制和能量计量重点实验室
摘要:
由天然气组成数据计算烃露点是获取烃露点的一种重要的检测方法,天然气组成分析已有相关方法标准,但对于C+6组成分析有不同的定量和数据处理方式。概述了计算烃露点的主要影响因素,重点分析了C+6延伸组成分析不同定量方式对计算烃露点结果的影响。采用气相色谱法分析了两个实际天然气样品,根据不同的定量方法和数据处理方式获得的C+6延伸组成数据预测了天然气的烃露点。结果表明,对于C+6延伸组成的分析,C6~C16按碳数归类,其中苯、甲苯、环己烷和甲基环己烷等组分单独定量时,由此获得完整天然气组成数据计算的烃露点和直接测定烃露点平均偏差在3 ℃以内,初步验证了计算法和直接测定法获得的烃露点结果的一致性。
关键词:  C+6延伸组成  架桥定量  碳数归类  烃露点  特殊组分
DOI:10.3969/j.issn.1007-3426.2018.06.016
分类号:
基金项目:中国石油天然气股份有限公司科学研究与技术开发项目“凝析天然气C+6组分分析技术优化和烃露点预测模型研究”(kt2017-21-21)
Effect of natural gas C+6 composition obtained by different quantitative methods on calculation of hydrocarbon dew point
Zeng Wenping1,2, Pu Changsheng1,2, Wang Xiaoqin1,2, Zhang Pu1,2, Wang Weijie1,2, He Fei1
1.Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;2. Key Laboratory of Natural Gas Quality Control and Energy Measurement, PetroChina, Chengdu, Sichuan, China
Abstract:
The calculation of hydrocarbon dew point from natural gas composition data is an important detection method for obtaining hydrocarbon dew point. Natural gas composition analysis has related methods and standards, but there are different quantitative and data processing methods for C+6 composition analysis. In this paper, the main factors influencing the calculation result of hydrocarbon dew point are summarized, among which the difference between different quantitative methods of C+6 extension analysis for predicting hydrocarbon dew point is emphatically discussed. Two real natural gas samples were analyzed by gas chromatography. The experimental data were obtained by different quantitative and data processing methods for C+6 extension components,and the hydrocarbon dew point of natural gas is predicted by using composition data of natural gas. The results show that C+6 components were classified according to the carbon number from C6 to C16, in which benzene, toluene, cyclohexane and methyl cyclohexane were respectively determined, and the complete analytical data of natural gas composition were obtained. The average deviation between the hydrocarbon dew point calculated through natural gas composition data and directly measured hydrocarbon dew point is less than 3 ℃.The consistency of hydrocarbon dew point obtained by calculation method and direct determination method is preliminarily verified.
Key words:  C+6 extension composition  quantification by bridging  carbon number classification  hydrocarbon dew point  special component