Volume 39 Issue 3
May  2022
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YU Yongjin, ZHANG Hang, XIA Xiujian, et al.Synthesis and study of an ultra-high temperature filtrate reducer for cement slurries[J]. Drilling Fluid & Completion Fluid,2022, 39(3):352-358 doi: 10.12358/j.issn.1001-5620.2022.03.014
Citation: YU Yongjin, ZHANG Hang, XIA Xiujian, et al.Synthesis and study of an ultra-high temperature filtrate reducer for cement slurries[J]. Drilling Fluid & Completion Fluid,2022, 39(3):352-358 doi: 10.12358/j.issn.1001-5620.2022.03.014

Synthesis and Study of an Ultra-High Temperature Filtrate Reducer for Cement Slurries

doi: 10.12358/j.issn.1001-5620.2022.03.014
  • Received Date: 2022-01-10
  • Accepted Date: 2022-02-28
  • Rev Recd Date: 2022-02-18
  • Publish Date: 2022-05-30
  • An ultra-high temperature filtrate reducer, F-SHT, was developed for formulating cement slurries used in ultra-deep wells and complex wells with ultra-high well temperatures. The development of F-SHT has broken through the bottleneck of ultra-high temperature water loss control of conventional filter loss reducers for cement slurries. Characterization of the molecular structure and performance evaluation of F-SHT showed that F-SHT has a number average molecular weight of 21,475 Da and low apparent viscosity which is benefit to the formulation of cement slurries. Significant thermal weight loss occurred when the temperature reaches 294 ℃, indicating that the molecular chains of F-SHT has good thermal stability. F-SHT can effectively control the fluid loss of cement slurries at temperatures up to 240 ℃ and in salt-saturated cement slurries. In static filtration test, a salt-saturated cement slurry treated with F-SHT had API filtration rate of 38 mL at 240 ℃/6.9 MPa. In general performance testing, the performance of the cement slurry at starting and halting of the machine, the stability and API filtration rate of the cement slurry were all qualified. In cementing the Φ177.8 mm liner string of the well Heshen-1, F-SHT performed successfully; the cement slurry best suited the situation of the well condition, the quality of the well cementing job was good, and the well cementing job provided a strong support to the exploration of oil and gas resources buried in ultra-deep formations.

     

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