Volume 35 Issue 1
Jan.  2018
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LIU Shuang, ZHANG Hong, QIU Xiaohui, FANG Bo, LU Yongjun, ZHAI Wen. Temperature Resistance and Shear Resistance of Xanthan Gum and Its Derivatives[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 119-123. doi: 10.3969/j.issn.1001-5620.2018.01.023
Citation: LIU Shuang, ZHANG Hong, QIU Xiaohui, FANG Bo, LU Yongjun, ZHAI Wen. Temperature Resistance and Shear Resistance of Xanthan Gum and Its Derivatives[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 119-123. doi: 10.3969/j.issn.1001-5620.2018.01.023
shu

Temperature Resistance and Shear Resistance of Xanthan Gum and Its Derivatives

doi: 10.3969/j.issn.1001-5620.2018.01.023

  • 1. Research Institute of Chemical Engineering, East China University of Science and Technology, Shanghai 200237;

  • 2. Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development, Langfang, Hebei 065007;

  • 3. Research Institute of Petroleum Exploration & Development, Dept. of Oilfield Chemistry, Beijing 100083

  • Received Date: 2017-09-11
  • Publish Date: 2018-01-30
    Abstract
  • Temperature resistance and shear resistance are important parameters of fracturing fluid and the one the key factors to the success of fracturing job. To widen the application of non-crosslinking xanthan gum fracturing fluids and improve their job performance, study has been conducted on the effects of chemical modification and molecular conformation of xanthan gum (XG) on the high temperature resistance and shear resistance of XG solution. It was found that at low temperatures, chemical modification can remarkably enhance the temperature resistance and shear resistance of XG. At high temperatures, chemical modification plays almost no role in enhancing the temperature resistance and shear resistance of XG. Chemical modification improves the networking structure of XG molecules and the viscoelasticity of XG solution. Addition of salts (ions) into XG solution accelerates the formation of double helix conformation of XG molecules. The combined action of chemical modification and salts on XG remarkably improves the temperature resistance, shear resistance and suspending capacity at elevated temperatures. Comparison of rheology before and after shearing at 180℃ indicated that salts can enhance the viscoelasticity, thixotropy and apparent viscosity of XG solution at elevated temperatures, improving its sand carrying capacity, and widening the application of non-crosslinking fracturing fluids formulated with XG and modified XG. It is concluded that combined action of chemical modification and salts greatly improves the rheology, temperature resistance and shear resistance of XG solution, thereby widening the application of non-crosslinking fracturing fluids formulated with XG, especially the XG fracturing fluids mixed with seawater.

     

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