Volume 40 Issue 1
Jan.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(1): 28-34
LI Chao, DI Wenwen, GENG Tie, et al.A Pickering emulsion oil based drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：28-34 doi: 10.12358/j.issn.1001-5620.2023.01.003
Citation: LI Chao, DI Wenwen, GENG Tie, et al.A Pickering emulsion oil based drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：28-34 doi: 10.12358/j.issn.1001-5620.2023.01.003
shu

A Pickering Emulsion Oil Based Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2023.01.003
  • 1.

    COSL Oilfield Chemicals Division, Yanjiao, Hebei 065201

  • 2.

    Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100

  • Received Date: 2022-09-03
  • Rev Recd Date: 2022-10-12
  • Publish Date: 2023-01-31
    Abstract
  • In a Pickering emulsion, the solid particle emulsifier is absorbed at the interface between oil and water, forming a stable interfacial film to prevent the coalescence of water droplets. This property can be used to improve the stability of oil based drilling fluids. However, in studies on the oil based drilling fluids based on Pickering emulsion, the interaction between a water droplet in the oil phase and an inorganic hydrophilic particle has been omitted; the effects of inorganic particles added to an oil based drilling fluid, such as calcium hydroxide, weighting agents and the drilled cuttings, on the existence of the water droplets in the emulsion are not considered. In laboratory study, calcium hydroxide, barite and kaolinite particles of different hydrating capacities were added into a W/O Pickering emulsion. Macro sedimentation experiment and microscope observation with microscopic images have proved that the water droplets are combined with the solid particles, existing in a form of bound water. This explains the aggregation of the solid particles. The bound water was characterized with laser confocal microscope and low temperature differential scanning calorimetry. The solid particles with bound water can be dispersed by treating the system with a dispersant, in this way the stability of the drilling fluid can be improved. An oil based drilling fluid based on W/O Pickering emulsion is not a water-in-oil (W/O) drilling fluid, it is, however, a system in which the bound water droplets are moderately dispersed into an oil phase. In addition, low temperature constant rheology can be achieved by adjusting the rheology of a low density oil based drilling fluid.

     

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