Volume 40 Issue 6
Dec.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(6): 778-786
LIU Jingli, LIU Pingjiang, REN Qiang, et al.A cement slurry for large temperature difference in wells of ten thousand meter depth[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：778-786 doi: 10.12358/j.issn.1001-5620.2023.06.012
Citation: LIU Jingli, LIU Pingjiang, REN Qiang, et al.A cement slurry for large temperature difference in wells of ten thousand meter depth[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：778-786 doi: 10.12358/j.issn.1001-5620.2023.06.012
shu

A Cement Slurry for Large Temperature Difference in Wells of Ten Thousand Meter Depth

doi: 10.12358/j.issn.1001-5620.2023.06.012
  • 1.

    Bohai Drilling Engineering Technology Research Institute, Tianjin 300451

  • 2.

    Bohai Drilling First Cementing Company, Renqiu，Hebei 062552

  • 3.

    State Key Laboratory of Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu，Sichuan 610500

  • Received Date: 2023-07-19
  • Rev Recd Date: 2023-09-02
    • Available Online: 2023-11-16
  • Publish Date: 2023-12-30
    Abstract
  • In cementing operation in ultradeep wells with long cementing sections, there is a large difference between the temperature at the top of the cement slurry and that at the bottom of the cement slurry. The low temperature at the top of the cement slurry retards the development of the strength of the set cement. To solve this problem, an early strength additive named EDTA-LDH (EDTA intercalated hydrotalcite) was developed through water solution polymerization. A cement slurry for working at big temperature difference conditions was formulated with EDTA-LDH. Laboratory experimental results show that this early strength additive has retarding effect to some extent; at a concentration of 2.0% EDTA-LDH and 4.0% retarder, a cement slurry has thickening time of 509 min at 240 ℃. After aging at 60 ℃ for 1 d or at 30 ℃ for 6 d, the cement slurry has compressive strengths of both greater than 7 MPa, and experiences maximum temperature difference of 210 ℃. The use of EDTA-LDH is beneficial to the development of the strength of the cement slurry column in low temperature without affecting the adjustability of the thickening time of the cement slurry. This early strength additive can work normally at temperatures above 300 ℃, and is suitable for cementing wells with large temperature differences.

     

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