西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (4): 120-126.DOI: 10.11885/j.issn.1674-5086.2018.06.20.01

• 石油与天然气工程 • 上一篇    下一篇

高CO2含量天然气偏差因子影响研究

雷霄1, 代金城2, 陈健1, 韩鑫1, 鲁瑞彬1   

  1. 1. 中海石油(中国)有限公司湛江分公司, 广东 湛江 524057;
    2. 西南石油大学石油与天然气工程学院, 四川 成都 610500
  • 收稿日期:2018-06-20 出版日期:2019-08-10 发布日期:2019-08-10
  • 通讯作者: 雷霄,E-mail:leix@cnooc.com.cn
  • 作者简介:雷霄,1972年生,男,汉族,四川岳池人,教授级高级工程师,主要从事油气田开发方面的研究工作。E-mail:leix@cnooc.com.cn;代金城,1994年生,男,汉族,四川广安人,硕士研究生,主要从事油气田开发的研究工作。E-mail:995625352@qq.com;陈健,1987年生,男,汉族,湖北黄冈人,工程师,主要从事油气田开发实验、油藏工程等方面的研究工作。E-mail:chenjian6@cnooc.com.cn;韩鑫,1985年生,男,汉族,湖北黄冈人,工程师,主要从事油藏工程方法方面的研究工作。E-mail:hanxin@cnooc.com.cn;鲁瑞彬,1989年生,男,汉族,河南驻马店人,工程师,主要从事油气田开发及规划方面的研究工作。E-mail:lurb4@cnooc.com.cn

Study on Influence of High CO2 Content on Gas Deviation Factor of Natural Gas

LEI Xiao1, DAI Jincheng2, CHEN Jian1, HAN Xin1, LU Ruibin1   

  1. 1. CNOOC China Limited, Zhanjiang Branch, Zhanjiang, Guangdong 524057, China;
    2. School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2018-06-20 Online:2019-08-10 Published:2019-08-10

摘要: 天然气偏差因子是天然气物性参数和地质储量计算的基础,其不仅受温度压力的影响,也是天然气组分与组成的函数。目前,对低含量CO2的天然气偏差因子计算方法精度较高,但对以DF气田典型代表的高含CO2天然气偏差因子,其计算精度难以得到保障。针对不同CO2含量天然气采用PVT实验方法,分析了CO2含量对天然气偏差因子的影响规律,并以实验结果为基础,用麦夸特法及通用全局优化法修正了DAK计算天然气偏差因子经验公式。结果表明,与重烃(乙烷、丙烷)对天然气偏差因子的影响规律相似,CO2的存在明显降低了天然气的偏差因子,且影响幅度随CO2含量增加而逐渐增大;当CO2含量较低时,DAK经验公式能够较准确计算天然气偏差因子,而当CO2含量大于50%时,应用修正的DAK经验公式能够获得满意的效果。

关键词: 高含CO2天然气, 偏差因子, 实验研究, 麦夸特法, DAK修正模型

Abstract: The gas deviation factor of natural gas is the basis for the calculation of the physical parameters and geological reserves of natural gas. It is affected by temperature and pressure and is also a function of natural gas composition and its components. At present, a high-precision calculation method of gas deviation factor suitable for natural gas with low CO2 content already exists. However, its calculation precision is not guaranteed when applied to the calculation of gas deviation factor for natural gas with high CO2 content, typically found in DF Gas Field. Targeting this problem, the influence of CO2 content on the gas deviation factor of natural gas was analyzed using the PVT experimental method. Based on the experimental results, the empirical formula of the DAK method for calculating the gas deviation factor of natural gas was modified using the Levenberg-Marquardt algorithm and the general global optimization method. The results show that, similar to the effects of heavy hydrocarbons (ethane and propane), the presence of CO2 significantly reduces the gas deviation factor of natural gas, and the magnitude of this influence gradually increases as CO2 content increases. When CO2 content is low, the DAK empirical formula can calculate the gas deviation factor of natural gas relatively accurately, whereas if CO2 content becomes larger than 50%, the corrected DAK empirical formula can lead to satisfactory results.

Key words: natural gas with high CO2 content, gas deviation factor, experimental research, Levenberg–Marquardt algorithm, corrected DAK model

中图分类号: