Volume 39 Issue 1
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TU Siqi, XIE Feiyan, AO Kangwei, et al.A high efficiency oil wash spacer for shale gas wells in Changning oilfield[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：82-86 doi: 10.12358/j.issn.1001-5620.2022.01.014
Citation: TU Siqi, XIE Feiyan, AO Kangwei, et al.A high efficiency oil wash spacer for shale gas wells in Changning oilfield[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：82-86 doi: 10.12358/j.issn.1001-5620.2022.01.014
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A High Efficiency Oil Wash Spacer for Shale Gas Wells in Changning Oilfield

doi: 10.12358/j.issn.1001-5620.2022.01.014
  • 1.

    CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Tianjin 300451

  • 2.

    CNPC Key Laboratory of Drilling Engineering; Laboratory of Cementing Technology, Tianjin 300451

  • 3.

    National Engineering Laboratory of Petroleum Drilling Technology, Tianjin 300451

  • 4.

    Downhole Services Company BHDC, Tianjin 300451

  • Received Date: 2021-09-27
  • Accepted Date: 2021-08-27
  • Rev Recd Date: 2021-11-07
  • Publish Date: 2022-05-06
    Abstract
  • The oil based drilling fluids used in horizontal drilling of shale gas wells in Changning oilfield are poorly compatible with the cement slurries, resulting in the mixture of the drilling fluid and cement slurry flocculated and difficult to displace from the annular spaces. To solve this problem, an oil wash additive BCS-130L was developed based on the types, functioning principles and HLB levels of surfactants. A high efficiency oil wash spacer was developed using BCS-130L, which is suitable for use in Changning. This spacer, with its density ranging between 1.5 g/cm3 and 2.4 g/cm3, can work normally at temperatures between 70 ℃ and 180 ℃; it cleans the oil based drilling fluids held up on the surface of the annular spaces and reverses the wettability of the surfaces. The spacer has good rheology and stability and is compatible with the drilling fluid and the cement slurry in use, it has satisfied the requirements of shale gas well cementing in Changning oilfield.

     

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    • References(6)
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