Volume 39 Issue 1
May  2022
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SHI He, SHI Haimin, NI Xiaoxiao, et al.Study on rheological modifier of high temperature high density clay-free oil-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：8-14 doi: 10.12358/j.issn.1001-5620.2022.01.002
Citation: SHI He, SHI Haimin, NI Xiaoxiao, et al.Study on rheological modifier of high temperature high density clay-free oil-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：8-14 doi: 10.12358/j.issn.1001-5620.2022.01.002
shu

Study on Rheological Modifier of High Temperature High Density Clay-free Oil-based Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2022.01.002
  • 1.

    CNPC Engineering Technology R & D Company Limited, Beijing 102206

  • 2.

    Drilling Technology Research Institute, PetroChina Jilin Oilfield Company, Songyuan, Jilin 138000

  • Received Date: 2021-09-30
  • Accepted Date: 2021-07-03
  • Rev Recd Date: 2021-11-05
  • Publish Date: 2022-05-06
    Abstract
  • Aiming at the problem of insufficient settlement stability of oil-based drilling fluids in high temperature environments, a small molecule fatty acid amide type rheological modifier FAA which can be used in high temperature environment was synthesized by reacting dimer fatty acids and diethylene triamine at a molar ratio of 1∶2, with the structural characterization, mechanism analysis and performance evaluation were also carried out. The results of rheological experiments and microscopic observations show that the FAA effectively improves the structural strength of the oil-based drilling fluid system by bridging the emulsion droplets to form a gel-like network structure, thereby effectively improving its solid-phase suspension ability and settlement stability. The evaluation results in the diesel-based drilling fluid system show that the FAA can effectively improve the yield point, φ6/φ3 revolution reading and yield point/plastic viscosity ratio of the system, and can effectively improve the high-temperature sedimentation stability of the system, making it standing at 220℃ for 5 days with the sedimentation factor SF less than 0.52 and no obvious sedimentation phenomenon occures.

     

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