Volume 40 Issue 3
May  2023
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SHI Ye, MU Jianlei, ZHU Feng, et al.Research and application of organic and inorganic hybrid thixotropic agents[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：397-402 doi: 10.12358/j.issn.1001-5620.2023.03.017
Citation: SHI Ye, MU Jianlei, ZHU Feng, et al.Research and application of organic and inorganic hybrid thixotropic agents[J]. Drilling Fluid & Completion Fluid，2023, 40（3）：397-402 doi: 10.12358/j.issn.1001-5620.2023.03.017
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Research and Application of Organic and Inorganic Hybrid Thixotropic Agents

doi: 10.12358/j.issn.1001-5620.2023.03.017
  • 1.

    Tianjin Key Laboratory of Complicated Conditions Drilling Fluids, Tianjin 300280

  • 2.

    CNPC Bohai Drilling Engineering Company Limited，Tianjin 300280

  • 3.

    School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350

  • 4.

    Zhejiang Institute of Tianjin University, Shaoxing, Zhejiang 312300

  • 5.

    Research Institute of Engineering Technology of CNPC Bohai Engineering Company Limited, Renqiu , Hebei 062552

  • Received Date: 2022-12-08
  • Rev Recd Date: 2023-01-31
    • Available Online: 2023-07-21
  • Publish Date: 2023-05-30
    Abstract
  • A thixotropic cement slurry can be obtained by adding thixotropic agent into a common cement slurry, and this thixotropic cement slurry can be used to deal with severe mud losses and difficulties in cementing a well penetrating weak formations. Thixotropic cement slurries presently in use have several shortages such as weak thixotropy, sensitive to temperature changes and poor overall performance etc., limiting their use in dealing with downhole problems. To improve the thixotropy of a cement slurry, a new thixotropic agent was developed by combining an organic polymer TDA-1 and the inorganic bentonite. TDA-1 is a polymer synthesized from isopentenol polyoxyethylene ether (TPEG), N, N -dimethyl acrylamide (DMAA) and acrylic acid (AA). TDA-1 and bentonite were then hybridized to produce the new thixotropic agent CBJ-1. The effects of the new hybridized inorganic thixotropic agent CBJ-1 on the performance of cement slurries were studied. Using IR and XRD, the molecular structure of CBJ-1 was characterized. Using gel strength test, the thixotropy of the cement slurry was measured. The experimental results show that the new thixotropic agent was successfully synthesized. It has wide range of work temperature, thus can be used to mitigate the temperature sensitivity problem of a thixotropic cement slurry. A cement slurry treated with CBJ-1 has big difference between the initial gel strength and the final gel strength, meaning that the cement slurry has good thixotropy. CBJ-1 has no negative effect on the filtration rate and thickening performance of the cement slurry. The experimental results show that CBJ-1 has excellent general performance.

     

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