Volume 39 Issue 3
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LIU Gang.Laboratory study on low temperature synthetic based drilling fluid[J]. Drilling Fluid & Completion Fluid,2022, 39(3):273-278 doi: 10.12358/j.issn.1001-5620.2022.03.002
Citation: LIU Gang.Laboratory study on low temperature synthetic based drilling fluid[J]. Drilling Fluid & Completion Fluid,2022, 39(3):273-278 doi: 10.12358/j.issn.1001-5620.2022.03.002

Laboratory Study on Low Temperature Synthetic Based Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2022.03.002
  • Received Date: 2021-12-11
  • Accepted Date: 2022-01-20
  • Rev Recd Date: 2021-12-24
  • Available Online: 2022-08-10
  • Publish Date: 2022-05-30
  • Oil based drilling fluid as the first choice of drilling complex formations has unwanted high viscosity and high gel strengths at low temperatures below zero degree Celsius. To solve this problem, a low temperature synthetic based drilling fluid was developed with low temperature emulsifiers, low freezing point gas-to-oil as oil phase, 30% CaCl2 solution as the water phase, and other optimized flow pattern modifiers. This synthetic based drilling fluid has properties that can be as good as those of oil based drilling fluids. At density of 2.0 g/cm3, the synthetic based drilling fluid, after aging at 180 ℃ for 16 hours, still had viscosity, gel strengths, electrical stability and flow property perfectly suitable for normal operation at -10 ℃. The HTHP filtration rate of this drilling fluid was less than 2 mL. This drilling fluid can effectively prevent downhole troubles arising from high equivalent circulating densities (ECD) and pipeline blocking caused by low temperatures.

     

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