Volume 42 Issue 1
Feb.  2025
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ZOU Yiwei, DAI Dan, WANG Yixin, et al.Mechanisms of organic phosphonate retarders to abnormally thicken oil well cement[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：110-116 doi: 10.12358/j.issn.1001-5620.2025.01.012
Citation: ZOU Yiwei, DAI Dan, WANG Yixin, et al.Mechanisms of organic phosphonate retarders to abnormally thicken oil well cement[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：110-116 doi: 10.12358/j.issn.1001-5620.2025.01.012
shu

Mechanisms of Organic Phosphonate Retarders to Abnormally Thicken Oil Well Cement

doi: 10.12358/j.issn.1001-5620.2025.01.012
  • 1.

    Cosl Oilfield Chemical Research Institute, Yanjiao, Hebei 065201

  • 2.

    College of Materials Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816

  • Received Date: 2024-09-28
  • Rev Recd Date: 2024-11-01
  • Publish Date: 2025-02-01
    Abstract
  • Organic phosphonates are generally used as retarders for cement slurries at high temperatures in Yanchang oilfield. This paper discusses the effects of the retarder sodium ethylene-diamine tetramethylene-phosphonate (EDTMPS) on the thickening performance of the class G high-sulfur-resistant (HSR) oil-well cements from four different manufacturers. The mechanisms of EDTMPS in retarding the thickening time of the four cement slurries were investigated through hydration heat measurement, XRD experiment and solubility measurement. The results of the measurement and experiment show that in the reactions of EDTMPS with the cements, EDTMPS inhibits the solution of dihydrate gypsum and accelerates the solution of C3A, thus the retarding effect of dihydrate gypsum is inhibited and C3A becomes fast hydrated, leading to an increase in the initial consistency of the cement slurry. On the other hand, EDTMPS can accelerate the solution of hemihydrate gypsum which releases SO42−. The SO42− ions released slow down the hydration process of C3A. By adjusting the concentrations of C3A, dihydrate gypsum and hemihydrate gypsum in the class G HSR oil-well cement slurry, the compatibility of the cement slurry with EDTMPS can be improved.

     

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