Volume 43 Issue 5
Oct.  2026
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2026  >  43(5): 603-612
Wang Quande, Jiang Guancheng, Feng Qi, et al.Development and performance of a dual-phenyl-bridged ultra-high temperature emulsifier for oil-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：603-612 doi: 10.12358/j.issn.1001-5620.2026.05.004
Citation: Wang Quande, Jiang Guancheng, Feng Qi, et al.Development and performance of a dual-phenyl-bridged ultra-high temperature emulsifier for oil-based drilling fluids[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：603-612 doi: 10.12358/j.issn.1001-5620.2026.05.004
shu

Development and Performance of a Dual-phenyl-bridged Ultra-high Temperature Emulsifier for Oil-based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2026.05.004
  • 1.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • 2.

    Beijing Shida Bochen Technology Co., Ltd., Beijing 102200

  • 3.

    Changqing Drilling Company, Chuanqing Drilling Engineering Co., Ltd., CNPC, Xi'an，Shaanxi 710018

  • 4.

    No.1 Oil Production Plant, Dagang Oilfield Group Co., Ltd., CNPC, Tianjin 300280

  • Received Date: 2026-03-02
  • Rev Recd Date: 2026-05-19
  • Publish Date: 2026-10-01
    Abstract
  • This study aimed to address the technical challenges of insufficient thermal stability and easy failure of the oil-water interfacial film in existing oil-based drilling fluid emulsifiers during ultra-high-temperature (>220 ℃) deep well and 10,000-meter-level ultra-deep well drilling. Based on the design concepts of rigid-skeleton-enhanced thermal stability andmulti-site adsorption,the study synthesized a novel ultra-high-temperature emulsifier (UHT-EM) featuring a double-benzene-bridged skeleton, double long-chain alkyl groups, and double calcium sulfonate head groups, using lauric acid and diphenylethane as raw materials. The molecular structure was characterized by infrared spectroscopy and proton nuclear magnetic resonance (1H NMR) spectroscopy. The emulsification performance and interfacial film strength were evaluated in terms of thermal stability, low-frequency oscillation, and microscopic morphology, and an ultra-high-temperature oil-based drilling fluid system based on UHT-EM was formulated. The results showed that the emulsion containing 1.0% UHT-EM exhibited ES of 1431 V after aging at 230 ℃ for 16 h, which remained at 729 V at 250 ℃, and dropped to 430 V at 260 ℃, significantly outperforming the emulsifiers HTM and Span80. Low-frequency oscillation tests indicated that the storage modulus G′ reached 649–801 Pa at low strain amplitudes and was consistently significantly higher than G″, demonstrating an elasticity-dominated high-strength characteristic. Microscopic morphology analysis showed that the emulsion maintained regular spherical shapes and a unimodal narrow particle size distribution within 230–250 ℃, whereas coalescence and destabilization occurred at 260 ℃ due to the synergistic failure of molecular anchoring and ionic crosslinking. The ultra-high-temperature oil-based drilling fluid formulated with UHT-EM (oil-water ratio 80∶20, density 2.0 g/cm3) achieved an ES value of 1226 V and FLHTHP of 28.0 mL after aging at 230 ℃ for 16 h. By virtue of the molecular synergy between the double-benzene-bridged rigid skeleton and the double calcium sulfonate head groups, UHT-EM significantly improved the thermal decomposition temperature and interfacial film strength, exhibiting excellent emulsification stability at 250 ℃. It can provide core material support for oil-based drilling fluids used in 10,000-meter-level ultra-deep well and ultra-high-temperature deep well drilling.

     

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