Volume 37 Issue 1
Feb.  2020
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LI Xiaolan, ZHENG Zhijun, GUO Peng. Synthesis and Performance Evaluation of High Temperature Oil Well Cement Retarder ZRT-1[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 93-96. doi: 10.3969/j.issn.1001-5620.2020.01.015
Citation: LI Xiaolan, ZHENG Zhijun, GUO Peng. Synthesis and Performance Evaluation of High Temperature Oil Well Cement Retarder ZRT-1[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 93-96. doi: 10.3969/j.issn.1001-5620.2020.01.015

Synthesis and Performance Evaluation of High Temperature Oil Well Cement Retarder ZRT-1

doi: 10.3969/j.issn.1001-5620.2020.01.015
  • Received Date: 2019-11-08
  • Publish Date: 2020-02-28
  • A high temperature retarder ZRT-1 was synthesized with a nonmetallic material and an organic polymer. The development of ZRT-1 is to overcome the high temperature stability limitation of water soluble polymers used in cement slurries. The optimum synthesis process was determined using orthogonal test and single factor method; the molar ratio of the monomers was: AMPS:IA:AA = 7.0:1.5:1.5. The concentrations of the coupling agent, the inorganic material and the initiator were 0.5%, 1% and 1.5%. The mass fraction of the monomers was 30%. The pH of the reaction was 4, the reaction temperature 65 ℃, and the reaction time 8 h. Characterization of the synthetic product by FT-IR, DSC/DTG and GPC showed that ZRT-1 had the molecular structure and functional groups required. The molecular structure and functional groups render ZRT-1 good thermal stability. ZRT-1 had a weight average molecular weight (Mw) of 10091, a number average molecular weight (Mn) of 2020, and a molecular weight distribution of 4.99. Evaluation of ZRT-1 showed that the thickening time of a cement slurry linearly increased the concentration of ZRT-1, and linearly decreased with temperature. A cement slurry treated with 0.4%-1.5% ZRT-1 had a thickening time between 200 min and 400 min at 114-230 ℃/54-90 MPa, and the thickening curve changed smoothly. The cement slurry also showed short transition time and rightangled thickening curve.

     

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