Volume 42 Issue 6
Dec.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(6): 705-712
LIU Zhiqin, CUI Yingzhong, XU Chao, et al.Technology of low aromatic oil-based gas-to-liquid drilling fluid for oil shale in western south China sea[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：705-712 doi: 10.12358/j.issn.1001-5620.2025.06.001
Citation: LIU Zhiqin, CUI Yingzhong, XU Chao, et al.Technology of low aromatic oil-based gas-to-liquid drilling fluid for oil shale in western south China sea[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：705-712 doi: 10.12358/j.issn.1001-5620.2025.06.001
shu

Technology of Low Aromatic Oil-based Gas-to-liquid Drilling Fluid for Oil Shale in Western South China Sea

doi: 10.12358/j.issn.1001-5620.2025.06.001
  • 1.

    CNOOC China Limited Zhanjiang Branch, Zhanjiang, Guangdong 524057

  • 2.

    School of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100

  • Received Date: 2025-06-20
  • Rev Recd Date: 2025-08-05
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • The second member of Liushagang Formation in Weishan Sag, Beibuwan Basin, is oil shale with highly developed micro-fractures and high brittle mineral content. PLUS/KCl water-based drilling fluid was used in vertical well drilling in the early stage, resulting in serious wellbore instability and frequent blockage. The problems existing in the water-based and diesel-based drilling fluids used in the area were analyzed in the laboratory. Based on the formula of the on-site diesel-based drilling fluid, a set of high performance and low aromatics gas-to-oil drilling fluid system was constructed by introducing low viscosity and low aromatics gas-to-oil production and grading optimal micro-nano sealing agent materials. The system has a lower activity of 0.62, a high recovery rate of 98%, no leakage in 300 μm micro-crack plugging, a settlement factor less than 0.51, better inhibition and plugging, and stable high temperature performance. The gas-to-oil drilling fluid was applied in 8 highly inclined rock oil exploration wells, and the application well operation was smooth, and the diameter enlargement rate was less than 2%. Compared with the diesel-based drilling fluid system, the maximum funnel viscosity and plastic viscosity were reduced by 54% and 41% respectively, and the daily loss was reduced by 50%, and the comprehensive cost was reduced by about 85 million yuan. This technology provides powerful drilling fluid technical support for accelerating the development of offshore shale oil resources.

     

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