Rheological properties of oil-based drilling fluids at high temperature and high pressure

  • Sheng-ying Zhao (赵胜英)
  • Jie-nian Yan (鄢捷年)Email author
  • Yong Shu (舒 勇)
  • Hong-xia Zhang (张洪霞)


The rheological properties of two kinds of oil-based drilling fluids with typically composition were studied at pressures up to 138 MPa and temperatures up to 204 °C using the RheoChan 7400 Rheometer. The experimental results show that the apparent viscosity, plastic viscosity and yield point decrease with the increase of temperature, and increase with the increase of pressure. The effect of pressure on the apparent viscosity, plastic viscosity and yield point is considerable at ambient temperature. However, this effect gradually reduces with the increase of temperature. The major factor influencing the rheological properties of oil-based drilling fluids is temperature instead of pressure in the deep sections of oil wells. On the basis of numerous experiments, the model for predict the apparent viscosity, plastic viscosity and yield point of oil-based drilling fluids at high temperature and pressure was established using the method of regressive analysis. It is confirmed that the calculated data are in good agreement with the measured data, and the correlation coefficients are more than 0.98. The model is convenient for use and suitable for the application in drilling operations.

Key words

oil-based drilling fluids high temperature high pressure rheological property mathematical model 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    GALATE J W, MITCHELL R F. Behavior of oil muds during drilling operations[C]// SPE Drilling Engineering. 1986: 97–106.Google Scholar
  2. [2]
    GAO E, ESTENSEN O, MACDONALD C, CASTLE S. Critical requirements for successful fluid engineering in HPHT wells: Modeling tools, design procedures & bottom hole pressure management in the field[C]// SPE European Petroleum Conference. Hague, 1998: 1–14.Google Scholar
  3. [3]
    ZHOU Fu-jian, LIU Yu-qing, YANG Xian-you, SONG Guang-shun. A study on rheological properties of oil-in water emulsion at high temperature and high pressure[J]. Acta Petrolei Sinica, 1999, 20(3): 77–81. (in Chinese)Google Scholar
  4. [4]
    YAN Jie-nian. A model for predicting the apparent viscosity of invert emulsion muds[J]. Petroleum Drilling Techniques, 1990, 14(1): 9–15. (in Chinese)Google Scholar
  5. [5]
    DONG Shu-li, YAN Jie-nian. Optimization of drilling fluid rheology model using least square fitting method[J]. Petroleum Drilling Techniques, 2000, 28(5): 27–29. (in Chinese)Google Scholar
  6. [6]
    ZHANG Rui, WANG Rui-he, QIU Zheng-song. Temperature/pressure relationships of yield stress and plastic viscosity for foamed drilling fluids[J]. Oilfield Chemistry, 2005, 22(1): 6–12. (in Chinese)Google Scholar
  7. [7]
    DAVISON J M, CLARY S, SAASEN A, ALLOUCHE M. Rheology of various drilling fluid systems under deepwater drilling conditions and the importance of accurate predictions of downhole fluid hydraulics[C]// SPE Annual Technical Conference and Exhibition. Houston, 1999: 1–13Google Scholar
  8. [8]
    Bjorkevoll K S, Vefring E H, Rommetveit R, Aadnoy B. Changes in active volume due to variations in pressure and temperature in HPHT Wells[C]// 7th Northern European Drilling Conference. Kristiansand, 1994.Google Scholar

Copyright information

© Central South University Press and Springer Berlin Heidelberg 2008

Authors and Affiliations

  • Sheng-ying Zhao (赵胜英)
    • 1
  • Jie-nian Yan (鄢捷年)
    • 1
    Email author
  • Yong Shu (舒 勇)
    • 1
  • Hong-xia Zhang (张洪霞)
    • 1
  1. 1.Key Laboratory of Petroleum Engineering of Ministry of EducationChina University of PetroleumBeijingChina

Personalised recommendations