Volume 36 Issue 3
Jun.  2019
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PAN Yidang, YU Peizhi. Effect of Density on the Performance of Oil Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 273-279. doi: 10.3969/j.issn.1001-5620.2019.03.002
Citation: PAN Yidang, YU Peizhi. Effect of Density on the Performance of Oil Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 273-279. doi: 10.3969/j.issn.1001-5620.2019.03.002
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Effect of Density on the Performance of Oil Base Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2019.03.002

  • School of Engineering Technology, China University of Geosciences(Beijing), Beijing 100083

  • Received Date: 2019-02-20
  • Publish Date: 2019-06-30
    Abstract
  • In field use of high density oil base drilling fluids, it was found that the properties of the oil base drilling fluids become unstable with increase in mud density. Laboratory study shows that addition of barite increases the viscosity and gel strength, and enhances the emulsion stability of oil base drilling fluids. There is a linear relationship between the electric stability potential and the concentration of barite. An oil base drilling fluid, when at higher densities, has an apparent viscosity that is affected by temperature, oil/water ratio, concentrations of organophilic clay and poor quality solids to a larger extent than when it is at lower densities. Also, an oil base drilling fluid, when at higher densities, has an electric stability potential that is affected by oil/water ratio, concentrations of CaCl2 and organophilic clay to a larger extent than when it is at lower densities. Summarization of laboratory studies shows that increase in the density of an oil base drilling fluid not only affects the properties of the drilling fluid, it also increases the sensibility of the fluid to other factors. Thus, when using high density oil base drilling fluids, the monitoring and adjustment of the properties of the drilling fluids should be strengthened.

     

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