Volume 37 Issue 2
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LI Xu, REN Shengli, LIU Wencheng, ZHAO Danhui, LIAO Maolin, LIN Liming. Study on Temperature and Pressure Correction Model for Predicting Liquid Phase Density of Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 168-173. doi: 10.3969/j.issn.1001-5620.2020.02.006
Citation: LI Xu, REN Shengli, LIU Wencheng, ZHAO Danhui, LIAO Maolin, LIN Liming. Study on Temperature and Pressure Correction Model for Predicting Liquid Phase Density of Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 168-173. doi: 10.3969/j.issn.1001-5620.2020.02.006
shu

Study on Temperature and Pressure Correction Model for Predicting Liquid Phase Density of Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2020.02.006

  • 1. Oilfield Chemistry Department, China Oilfield Services Limited, Hebei 065201;

  • 2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083;

  • 3. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190

  • Received Date: 2019-11-19
  • Publish Date: 2020-04-28
    Abstract
  • The density of a drilling fluid is the main factor affecting the pressure distribution along the wellbore. An accurate calculation of the density of a drilling fluid is the key to the avoidance of well kick, blowout and mud losses. Since liquid phase in drilling fluid has densities changing with pressure and temperature, the density of the drilling fluid measured at the surface disagrees with the real density of the drilling fluid downhole. This density disagreement of the liquid phase has to be corrected taking into account the temperature and pressure in the hole. This paper presents a modified temperature and pressure correction model for calculating the real downhole density by introducing a quadratic term of temperature into the API temperature-pressure correction model based on laboratory experiments. Comparing the calculation results with the new model with the experimental data, it was found the new model is superior to the API model. For a drilling fluid whose density is sensitive to high temperature, the new model predicts downhole drilling fluid density with much higher accuracy.

     

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