Volume 42 Issue 4
Jul.  2025
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HAN Zixuan, HAN Xiuzhen, WANG Xianguang, et al.Research and application of white oil-based drilling fluid technology for long horizontal wells in western sichuan [J]. Drilling Fluid & Completion Fluid,2025, 42(4):509-515 doi: 10.12358/j.issn.1001-5620.2025.04.010
Citation: HAN Zixuan, HAN Xiuzhen, WANG Xianguang, et al.Research and application of white oil-based drilling fluid technology for long horizontal wells in western sichuan [J]. Drilling Fluid & Completion Fluid,2025, 42(4):509-515 doi: 10.12358/j.issn.1001-5620.2025.04.010

Research and Application of White Oil-Based Drilling Fluid Technology for Long Horizontal Wells in Western Sichuan

doi: 10.12358/j.issn.1001-5620.2025.04.010
  • Received Date: 2025-04-06
  • Rev Recd Date: 2025-05-02
  • Publish Date: 2025-07-31
  • In order to address the challenges of annular blockage and borehole instability during the drilling process of long horizontal wells in western Sichuan, this study analyzed the geological characteristics of the formation. Experimental research was conducted to understand the mechanism behind borehole instability. The findings revealed that in sea-related geological formations in Western Sichuan Basin, the risk of borehole instability is higher in the direction of minimum principal stress compared to that of maximum principal stress. The reservoir rock exhibits hard brittleness, fractured formations, developed microfractures, poor interlayer cementation, and a tendency for drilling cuttings deposition leading to annular blockage. Under pressure excitation, fractures further expand causing borehole instability. Based on these findings, flow type stabilizer SMRS-1 was developed. Emulsifying agents and nano-micron sealing agent SMNR-2 were carefully selected to construct a high-temperature long-term stable white oil-based drilling fluid system. After 7 days of rolling aging at 160℃, this system exhibited good high-temperature long-term stability with a dynamic viscosity ratio ≥0.20 and a high-temperature high-pressure filtration loss <4.0 mL at 160℃ along with breakdown voltage >600 V. The successful application of this drilling fluid in well PZ5-3 effectively resolved issues related to annular blockage and borehole instability encountered during long horizontal well drilling operations within western Sichuan.

     

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