Volume 40 Issue 3
May  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(3): 325-331
HU Zubiao, WANG Qingchen, ZHANG Qin, et al.The use of a high performance water based drilling fluid in drilling the 5000 m horizontal section of a shale oil well in Changqing[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：325-331 doi: 10.12358/j.issn.1001-5620.2023.03.007
Citation: HU Zubiao, WANG Qingchen, ZHANG Qin, et al.The use of a high performance water based drilling fluid in drilling the 5000 m horizontal section of a shale oil well in Changqing[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：325-331 doi: 10.12358/j.issn.1001-5620.2023.03.007
shu

The Use of a High Performance Water Based Drilling Fluid in Drilling the 5000 m Horizontal Section of a Shale Oil Well in Changqing

doi: 10.12358/j.issn.1001-5620.2023.03.007
  • 1.

    Changqing Drilling Branch, CNPC Chuanqing Drilling Engineering Limited Company, Xi'an, Shaanxi 710000

  • 2.

    Science and Technology Department, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051

  • Received Date: 2022-12-22
  • Rev Recd Date: 2023-01-29
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • In 2019, Changqing oilfield has drilled a well with horizontal section of 4,000 m in length, the first long horizontal section well in Asia. In 2021, a well with horizontal section of 5,000 m was drilled in Changqing with water based drilling fluids. The key issues in drilling the ultra-long horizontal section wells are the lubricity of the drilling fluids and hole cleaning. To deal with these two issues, a high performance gel strength additive TQ-8 and a high efficiency drilling lubricant HTZ were developed with natural materials as the basic materials, and group grafting and fermenting were used in the synthesis process. Using these two additives, a drilling fluid suitable for 5,000 m horizontal section well drilling was formulated. The composition of the drilling fluid is as follows:(4%-6%)HTZ + (0.5%-2%)TQ-8 + (0.5%-2%)mudstone inhibitor YYZ-1 + (1%-2% )PAC-LV + (1%-2%)BLA-LV + (3%-4%)filming plugging agent FDJ-1 + (20%-80%) soluble weighting agent + caustic soda. It was found in field application that the hole cleaning, lubricity and contamination resistance of this drilling fluid were all better than the drilling fluid used in drilling the well with 4,000 m horizontal section. This drilling fluid technology has been used on the shale oil well Hua-H90-3 in Changqing. Friction experienced in the tripping of the drill string before casing running was 400 kN, and the remaining hook load after casing running was 17 tons, meaning that this drilling fluid has the potential of drilling wells with longer horizontal sections.

     

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