Volume 42 Issue 5
Sep.  2025
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YUAN Yuehui, GENG Yuan, SUN Minghao, et al.Remove detrimental solids from recycled old drilling fluids using oil-based drilling fluid flocculants[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：623-630 doi: 10.12358/j.issn.1001-5620.2025.05.008
Citation: YUAN Yuehui, GENG Yuan, SUN Minghao, et al.Remove detrimental solids from recycled old drilling fluids using oil-based drilling fluid flocculants[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：623-630 doi: 10.12358/j.issn.1001-5620.2025.05.008
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Remove Detrimental Solids from Recycled Old Drilling Fluids Using Oil-Based Drilling Fluid Flocculants

doi: 10.12358/j.issn.1001-5620.2025.05.008
  • 1.

    CNPC Engineering Technology R＆D Company Limitied, Beijing 102206

  • 2.

    Natural Gas Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an, Shaanxi 710065

  • Received Date: 2025-04-19
  • Rev Recd Date: 2025-06-02
  • Publish Date: 2025-09-30
    Abstract
  • Recycled old oil-based drilling fluids generally contain high concentrations of detrimental solids which result in performance deterioration of the drilling fluids. These detrimental solids can be removed through flocculation. In this study, an oil-based drilling fluid flocculant XN-1 was characterized for its performance in flocculating detrimental drilled solids, the flocculation mechanism of XN-1 was investigated, and the effectiveness of removing drilled solids and optimizing the properties of the oil-based drilling fluids through a combination of flocculation, screening and centrifugation was evaluated. Laboratory study and field experiment show that XN-1 has a good flocculating action in the old oil-based drilling fluid: the sizes of the flocs increase from submicron to 60 μm. After flocculation and screening, about 20% of the detrimental drilled solids are removed from the drilling fluid. After flocculation and centrifugation, 70.50% of the detrimental solids can be removed from the drilling fluid. The old mud, with the detrimental solids being removed, can be used to formulate new muds with significantly optimized properties. The application of the flocculant XN-1 effectively improves the reuse of old oil-based drilling fluids, realizes the effective recycling of old oil-based drilling fluids and greatly reduces of amount of hazardous and waste drilling fluids, and effectively solves the difficulty of removing detrimental solids from oil-based drilling fluids.

     

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