Volume 40 Issue 3
May  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(3): 349-355
JIN Junbin, GAO Shuyang, CHEN Xiaofei.Drilling fluid technology for drilling the slim hole horizontal shale oil well Shuaye-3-7HF[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：349-355 doi: 10.12358/j.issn.1001-5620.2023.03.010
Citation: JIN Junbin, GAO Shuyang, CHEN Xiaofei.Drilling fluid technology for drilling the slim hole horizontal shale oil well Shuaye-3-7HF[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：349-355 doi: 10.12358/j.issn.1001-5620.2023.03.010
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Drilling Fluid Technology for Drilling the Slim Hole Horizontal Shale Oil Well Shuaye-3-7HF

doi: 10.12358/j.issn.1001-5620.2023.03.010
  • 1.

    State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Developemt，Beijing 100101

  • 2.

    Sinopec Research institute of Petroleum Engineering, Beijing 100101

  • Received Date: 2022-10-09
  • Rev Recd Date: 2022-12-18
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • The well Shuaiye-3-7HF is a Φ118 mm slim hole sidetracked horizontal shale oil well drilled in the Qintong block in northern Jiangsu area. Several problems were encountered during drilling, such as instability of shale formations, high pressure losses in the annular spaces, mud losses, higher requirement on friction reduction in drilling the horizontal section, as well as CO2 contamination etc. A water-based drilling fluid SM-ShaleMud-II for shale drilling was formulated in laboratory. Evaluation of this mud has shown that it has excellent inhibitive capacity, plugging capacity and lubricity, and is suitable for drilling the long horizontal section shale oil wells in the northern Jiangsu area. Field application has shown that the HTHP filter loss of the SM-ShaleMud-II drilling fluid was less than 7 mL, the adhesive coefficient of the mud was less than 0.07, and the overpull encountered during tripping out of hole after drilling to the total depth was less than 16 tons. The stability of the Fu-2 member, a shale reservoir section, was effectively maintained for 110 hours, greatly changed the past understanding of the length of time the Fu-2 member can be exposed to water-based drilling fluids. The length of the Φ118 mm slim hole was drilled to a length of 1,948.66 m, the longest open hole penetrating the shale formations in the area, and the length of the horizontal section is 1,361.66 m, the longest horizontal section in the same area. The experiences obtained in using this water-based drilling fluid have provided a good reference for subsequent slim hole long horizontal well drilling, and have paved the way for large-scale application of the SM-ShaleMud-II drilling fluid in shale oil drilling in the northern Jiangsu area.

     

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