SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (6): 795-802.DOI: 10.1016/j.cjche.2015.12.022

• 第25届中国过程控制会议专栏 • 上一篇    下一篇

Mixture temperature prediction of waxy oil-water two-phase system flowing near wax appearance temperature

Ali Piroozian1, Muhammad A. Manan1, Issham Ismail1, Rahmat Mohsin2, Ali Esfandyari Bayat2, Mac Darlington Uche Onuoha3, Mahmoud Hemmati1   

  1. 1 Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia;
    2 Malaysia Petroleum Resources Corporation(UTM-MPRC) Institute for Oil and Gas, Universiti Teknologi Malaysia, Johor 81310, Malaysia;
    3 Offshore Oil and Gas Research Center, College of Mechanical and Oil/Gas Transportation Engineering, China University of Petroleum, Beijing 102249, China
  • 收稿日期:2015-07-29 修回日期:2015-10-21 出版日期:2016-06-28 发布日期:2016-07-12
  • 通讯作者: Ali Piroozian
  • 基金资助:

    Supported by the Malaysia's Ministry of Higher Education (FRGS/4F136) and the University Teknologi Malaysia (RUG/01H68).

Mixture temperature prediction of waxy oil-water two-phase system flowing near wax appearance temperature

Ali Piroozian1, Muhammad A. Manan1, Issham Ismail1, Rahmat Mohsin2, Ali Esfandyari Bayat2, Mac Darlington Uche Onuoha3, Mahmoud Hemmati1   

  1. 1 Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia;
    2 Malaysia Petroleum Resources Corporation(UTM-MPRC) Institute for Oil and Gas, Universiti Teknologi Malaysia, Johor 81310, Malaysia;
    3 Offshore Oil and Gas Research Center, College of Mechanical and Oil/Gas Transportation Engineering, China University of Petroleum, Beijing 102249, China
  • Received:2015-07-29 Revised:2015-10-21 Online:2016-06-28 Published:2016-07-12
  • Contact: Ali Piroozian
  • Supported by:

    Supported by the Malaysia's Ministry of Higher Education (FRGS/4F136) and the University Teknologi Malaysia (RUG/01H68).

摘要: Temperature sensitivity of waxy crude oils makes it difficult to study their flow behaviour in the presence of water especially near their wax appearance temperature (WAT). In this study a method was proposed and implemented to mitigate such difficulties which was applied in predicting mixture temperatures (Tm) of a typical Malaysian waxy crude oil and water flow in a horizontal pipe. To this end, two analytical models were derived firstly from calorimetry equation which based on developed two correlations for defining crude oil heat capacity actualized from the existed specific heat capacities of crude oils. The models were then applied for a set of experiments to reach the defined three predetermined Tm (26℃, 28℃ and 30℃). The comparison between the predicted mixture temperatures (Tm,1 and Tm,2) from the two models and the experimental results displayed acceptable absolute average errors (0.80%, 0.62%, 0.53% for model 1; 0.74%, 0.54%, 0.52% for model 2).Moreover, the average errors for both models are in the range of standard error limits (±0.75%) according to ASTM E230. Conclusively, the proposed model showed the ease of obtaining mixture temperatures close to WAT as predetermined with accuracy of ±0.5℃ approximately for over 84% of the examined cases. The method is seen as a practical reference point to further study the flow behaviour of waxy crudes in oil-water two-phase flow system near sensitive temperatures.

关键词: Mixture temperature prediction, Analytical model, Waxy oil-water two-phase flow, Wax appearance temperature

Abstract: Temperature sensitivity of waxy crude oils makes it difficult to study their flow behaviour in the presence of water especially near their wax appearance temperature (WAT). In this study a method was proposed and implemented to mitigate such difficulties which was applied in predicting mixture temperatures (Tm) of a typical Malaysian waxy crude oil and water flow in a horizontal pipe. To this end, two analytical models were derived firstly from calorimetry equation which based on developed two correlations for defining crude oil heat capacity actualized from the existed specific heat capacities of crude oils. The models were then applied for a set of experiments to reach the defined three predetermined Tm (26℃, 28℃ and 30℃). The comparison between the predicted mixture temperatures (Tm,1 and Tm,2) from the two models and the experimental results displayed acceptable absolute average errors (0.80%, 0.62%, 0.53% for model 1; 0.74%, 0.54%, 0.52% for model 2).Moreover, the average errors for both models are in the range of standard error limits (±0.75%) according to ASTM E230. Conclusively, the proposed model showed the ease of obtaining mixture temperatures close to WAT as predetermined with accuracy of ±0.5℃ approximately for over 84% of the examined cases. The method is seen as a practical reference point to further study the flow behaviour of waxy crudes in oil-water two-phase flow system near sensitive temperatures.

Key words: Mixture temperature prediction, Analytical model, Waxy oil-water two-phase flow, Wax appearance temperature