吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (2): 564-572.doi: 10.13278/j.cnki.jjuese.201502205

• 地质工程与环境工程 • 上一篇    下一篇

高温高压下CO2在水中溶解度实验及理论模型

侯大力1,2, 罗平亚2, 王长权3, 孙雷2, 汤勇2, 潘毅2   

  1. 1. 成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059;
    2. 西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500;
    3. 长江大学石油工程学院, 武汉 430100
  • 收稿日期:2014-07-25 发布日期:2015-03-26
  • 作者简介:侯大力(1983-),男,讲师,博士,主要从事油气藏相态、油气藏数值模拟及注气提高采收率技术研究,E-mail:houdali08@163.com
  • 基金资助:

    国家"十二·五"科技攻关重大专项(2011B-1507)

Experimental Research and Theoretical Model for CO2 Solubility in Water Under High Temperature and High Pressure

Hou Dali1,2, Luo Pingya2, Wang Changquan3, Sun Lei2, Tang Yong2, Pan Yi2   

  1. 1. The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;
    2. The State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, China;
    3. Petroleum Engineering College of Yangtze University, Wuhan 430100, China
  • Received:2014-07-25 Published:2015-03-26

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摘要：

利用自行研制的高温高压反应釜,在不同温度、压力和矿化度条件下测试CO2在地层水中的溶解度。实验结果表明:温度一定的条件下,CO2在水中的溶解度随压力的增加而增加;压力一定的条件下,CO2在水中溶解度的主要变化趋势为随温度的增加而降低,当温度大于100℃、压力在22 MPa左右时,CO2在地层水中的溶解度将发生异常,出现低压(小于22 MPa)时随温度的增加而降低,高压(大于22 MPa)时随温度的增加而略微升高;在温度压力都一定的条件下,CO2在水中的溶解度随矿化度的增加而降低。并且,在新测得的实验数据和已有的实验数据的基础上,通过修正PR-HV状态方程中的参数,建立了一个能够精确计算CO2在水中溶解度的模型;并将该模型与其他模型对比。对比结果表明,该模型计算精度最高,平均相对误差仅为2.69%。

关键词: 高温高压, CO2, 溶解度, 理论模型

Abstract:

By using the independently developed high-temperature/high-pressure reactor,CO2 water solubility has been tested under different temperatures,pressures and salinities. The results show that the water solubility of CO2 increases with pressure under a certain temperature, while it declines with the increase of temperature under a certain pressure. However, when temperature is above 100℃ and pressure is around 22 MPa,the solubility is prone to decrease with increasing temperature under a low pressure (less than 22 MPa) and the solubility is prone to slightly increase with increasing temperature under a high pressure(greater than 22 MPa). Besides, under a certain temperature and pressure,CO2 water solubility decreases with the increase of water salinity. On the basis of measured and existing data, a new model has been built to calculate CO2 water solubility precisely by modifying the parameters of PR-HV EOS. In comparison to other models, its accuracy is higher with an average relative error of 2.69%.

Key words: high temperature and high pressure, CO2, solubility, theoretical model

中图分类号: 

  • TE357

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