Volume 39 Issue 1
May  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(1): 76-81
LI Xiaolin, LI Jianhua, YANG Hongbin, et al.Study on thermally viscosifying copolymer as a high temperature stabilizer for high density cement slurries[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：76-81 doi: 10.12358/j.issn.1001-5620.2022.01.013
Citation: LI Xiaolin, LI Jianhua, YANG Hongbin, et al.Study on thermally viscosifying copolymer as a high temperature stabilizer for high density cement slurries[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：76-81 doi: 10.12358/j.issn.1001-5620.2022.01.013
shu

Study on Thermally Viscosifying Copolymer as a High Temperature Stabilizer for High Density Cement Slurries

doi: 10.12358/j.issn.1001-5620.2022.01.013
  • 1.

    No.2 Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280

  • 2.

    No.6 Production Plant of CNPC Dagang Oilfield Company, Tianjin 300280

  • Received Date: 2021-09-02
  • Accepted Date: 2021-09-02
  • Rev Recd Date: 2021-10-12
  • Publish Date: 2022-05-06
    Abstract
  • To dela with the loss of settling stability of cement slurries at elevated temperatures, a high temperature high density cement slurry stabilizer based on a thermally viscosifying copolymer was developed. A new hydrophobic monomer was introduced into the molecule of the thermally viscosifying copolymer. To understand the thermal viscosification mechanisms of this copolymer, the rheology of the copolymer solution was tested at different temperatures. The apparent viscosity of the copolymer solution increases with temperature, and reaches its maximum value at 115-125 ℃. Continued increasing the temperature, the apparent viscosity of the copolymer solution was slightly decreasing, however, the apparent viscosity of the solution at 150 ℃ was still two to four times the apparent viscosity of the solution at the beginning of the test, indicating that the copolymer has good thermally viscosifying effect. A high temperature suspending stabilizer for high density cement slurries was developed with this copolymer and other additives. In laboratory experiment, the effects of the stabilizer on the settling stability of cement slurries were evaluated, the rheology, filter loss, free water content, thickening performance as well as compressive strength of the cement slurry containing the stabilizer were measured. The experimental results showed that a 2.5 g/cm3 cement slurry treated with 1% stabilizer had its differential density at 150 ℃ reduced from 0.58 g/cm3 to 0.07 g/cm3, and the differential density of the corresponding set cement reduced to less than 0.08 g/cm3. The thinning effect of the cement slurry at elevated temperatures was mitigated and the stability of the cement slurry was significantly improved. After treatment with the stabilizer, the high density cement slurry had low filter loss and free water content, and the stabilizer had only minor effect on the thickening time, rheology and compressive strength of the cement slurry. The overall properties of the cement slurry treated with the stabilizer have satisfied the needs of field operations.

     

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