Volume 40 Issue 1
Jan.  2021
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Zhu Xuming, Wu Xiaoming, Zheng Wenlong, Mulati Dina, Jiang Ziwei. Factors affecting high temperature rheological properties of polymers used in drilling fluid[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 200-208. doi: 10.19509/j.cnki.dzkq.2021.0115
Citation: Zhu Xuming, Wu Xiaoming, Zheng Wenlong, Mulati Dina, Jiang Ziwei. Factors affecting high temperature rheological properties of polymers used in drilling fluid[J]. Bulletin of Geological Science and Technology, 2021, 40(1): 200-208. doi: 10.19509/j.cnki.dzkq.2021.0115

Factors affecting high temperature rheological properties of polymers used in drilling fluid

doi: 10.19509/j.cnki.dzkq.2021.0115
  • Received Date: 16 Mar 2019
  • Polymer has a significant effect on the high temperature rheology of drilling fluid.The effects of polymer type, addition amount, shear time, salt and clay on the HTHP rheological properties were compared and analyzed, and the relationship of shear rate and shear stress was fitted to different rheological models.The increase of temperature, shear time and salt amount all led to the decrease of viscosity, especially when the temperature exceeded 190℃.In the cooling progress, the viscosity recovery rates of polymer solutions containing 5% HCOONa and 5% NaCl are 86.8% and 2.7%, respectively.Bingham model was used to characterize the mixture of polymer and clays, and the maximum yield point was 5.47 Pa at 220℃.Heating increases the tendency of the polymer solution to change from pseudoplastic to Newtonian.Above 130℃, the tendency of viscosity to decrease is obvious duedue to shear time.Meanwhile, the viscosity of the formate-containing polymer salt solution is higher than that of the chlorinated salt, and the viscosity retention rate of the former in the cooling process is also higher.The presence of clay enhances the structure force of the polymer solution, which is helpful for cuttings transportation at high temperatures.

     

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