Volume 39 Issue 2
Jun.  2022
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YANG Lanping, LI Zhiqiang, NIE Qiangyong, et al.Study on effects of temperature and pressure on density of oil based drilling fluids and the mathematical model thereof[J]. Drilling Fluid & Completion Fluid,2022, 39(2):151-157 doi: 10.12358/j.issn.1001-5620.2022.02.004
Citation: YANG Lanping, LI Zhiqiang, NIE Qiangyong, et al.Study on effects of temperature and pressure on density of oil based drilling fluids and the mathematical model thereof[J]. Drilling Fluid & Completion Fluid,2022, 39(2):151-157 doi: 10.12358/j.issn.1001-5620.2022.02.004

Study on Effects of Temperature and Pressure on Density of Oil Based Drilling Fluids and the Mathematical Model Thereof

doi: 10.12358/j.issn.1001-5620.2022.02.004
  • Received Date: 2021-10-10
  • Accepted Date: 2022-01-15
  • Rev Recd Date: 2021-12-18
  • Publish Date: 2022-06-23
  • The density of oil based drilling fluids is significantly affected by temperature and pressure. Understanding the change of the density of oil based drilling fluids is of importance to the safety of the drilling operation. Oil based drilling fluids of 4 different densities with the same composition copied from the composition of a field drilling fluid were formulated in laboratory and were tested for the change of density with an HTHP density balance made by Anton Paar Company in temperature range of 60 – 220 ℃ and pressure range of 20 – 120 MPa. Using the teste results, the effects of temperature and pressure on the density of the oil based drilling fluids were investigated, and a temperature-pressure binary mathematical model about the density of oil based drilling fluid was established. The accuracy of the model was verified with field oil based drilling fluids of different densities, and it was found that the values predicted with the model and the values measured agreed closely with each other, the average prediction accuracy of the model is up to 97.93%, meaning that the model is able to satisfy the needs of field application. Verification of the model on another two oil based drilling fluids with similar composition showed an average error of 9.24%, indicating a high prediction accuracy.

     

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