Volume 42 Issue 5
Sep.  2025
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2025  >  42(5): 594-599
GONG Chunwu, XU Nuo, SHENG Yang, et al.Drilling fluid technology for test well with ultra-long horizontal section in shale oil block Gulong[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：594-599 doi: 10.12358/j.issn.1001-5620.2025.05.004
Citation: GONG Chunwu, XU Nuo, SHENG Yang, et al.Drilling fluid technology for test well with ultra-long horizontal section in shale oil block Gulong[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：594-599 doi: 10.12358/j.issn.1001-5620.2025.05.004
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Drilling Fluid Technology for Test Well with Ultra-Long Horizontal Section in Shale Oil Block Gulong

doi: 10.12358/j.issn.1001-5620.2025.05.004
  • 1.

    Mud Service Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • 2.

    No.1 Drilling Engineering Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • 3.

    Downhole Technology Service Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • Received Date: 2025-04-07
  • Rev Recd Date: 2025-05-13
  • Publish Date: 2025-09-30
    Abstract
  • With the development of the “Daqing Gulong Continental Shale Oil National Demonstration Zone”, wells with ultra-long horizontal sections are drilled to evaluate the correlation between the length of the horizontal section and the oil and gas production rate of a well. The length of the horizontal section is planned to be extended from the present 2000-2500 m to 3000-3500 m. Based on the formation characteristics of the Gulong shale oil block, drilling problems such as borehole wall stability, drag and friction reduction and borehole cleaning etc. that are probably encountered in drilling the ultra-long horizontal section wells were analyzed; the oil-based drilling fluid BH-OBM was optimized for those properties such as density, oil/water ratio and plugging performance, etc. During drilling, a “low viscosity high gel strength” rheology strategy and high drilling parameters were used to ensure hole cleaning and low friction and drag. The drilling operation of the test well GY2-Q9-H47 was successful: the average percent hole enlargement of the Φ215.9 mm was only 3.61% (based on wireline logging data), no borehole wall instability was encountered during drilling, and two new records in the shale gas oil block were set: the deepest well (5526 m) and the longest horizontal section (3123 m).

     

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