Volume 38 Issue 5
Sep.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(5): 568-575
XIE Chunlin, YANG Lili, JIANG Guancheng, et al.Rheological characteristics of oil base drilling fluids and its mathematical model under coupled hthp conditions[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：568-575 doi: 10.12358/j.issn.1001-5620.2021.05.005
Citation: XIE Chunlin, YANG Lili, JIANG Guancheng, et al.Rheological characteristics of oil base drilling fluids and its mathematical model under coupled hthp conditions[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：568-575 doi: 10.12358/j.issn.1001-5620.2021.05.005
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Rheological Characteristics of Oil Base Drilling Fluids and Its Mathematical Model under Coupled HTHP Conditions

doi: 10.12358/j.issn.1001-5620.2021.05.005
  • 1.

    State Key Laboratory of Petroleum Resources and Prospecting, Key Laboratory of Petroleum Engineering (Ministry of Education), China University of Petroleum, Beijing 102249

  • 2.

    Zhanjiang Branch of CNOOC China Ltd., Zhanjiang,Guangdong 524057

  • 3.

    Drilling Fluid Technology Service Company, CNPC Chuanqing Drilling Engineering Company Limited,Chengdu, Sichuan 610051

  • Received Date: 2021-05-26
  • Publish Date: 2021-09-30
    Abstract
  • Abstract To investigate the effects of temperature and pressure on the rheological characteristics of oil based drilling fluids under coupled high temperature and high pressure, the rheology of four high temperature oil based drilling fluids with densities of 1.4 g/cm3, 1.8 g/cm3, 2.2 g/cm3 and 2.4 g/cm3 was measured at coupled high temperature high pressure conditions with a Rheometer Fann iX77 which is able to measure the rheology of drilling fluids with ultra-high densities at elevated temperatures and pressures. It was found that the apparent viscosity and the plastic viscosity of the four oil based drilling fluids gradually decrease with increase in temperature and gradually increase with increase in pressure. The yield points of the four drilling fluids first increase and then decrease with increase in temperature. When the temperature was increased to above about 160 ℃, the effect of high temperature on the rheology of the four drilling fluids was greatly weakened. In addition, a mathematical model involving temperature and pressure of the oil based drilling fluids was obtained based on the analyses of the rheological parameters measured of the four drilling fluids under coupled high temperature and high pressure. Error analysis results show that the model has a good fit to the measured parameters in the experiment of the drilling fluids with different densities, with the coefficient of determination R being greater than 0.96. It is thus determined that the mathematical model can be used to accurately predict the rheological characteristics of oil based drilling fluids under each coupled temperature and pressure condition.

     

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