Volume 38 Issue 2
Aug.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(2): 146-151,157
GAO Wei, LI Yinting, YU Fuchun, LI Shuanggui, MAO Hui. Development of A Polymer Filter Loss Reducer for Ultra-High Temperature Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 146-151,157. doi: 10.3969/j.issn.1001-5620.2021.02.003
Citation: GAO Wei, LI Yinting, YU Fuchun, LI Shuanggui, MAO Hui. Development of A Polymer Filter Loss Reducer for Ultra-High Temperature Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 146-151,157. doi: 10.3969/j.issn.1001-5620.2021.02.003
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Development of A Polymer Filter Loss Reducer for Ultra-High Temperature Water Base Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2021.02.003

  • 1. Petroleum Engineering Technology Research Institute, Sinopec Northwest Oilfield Company, Urumqi, Xinjiang 830011;

  • 2. Key Laboratory of Enhanced Recovery for Fracture-Cave Oil Reservoir, Sinopec, Urumqi, Xinjiang 830011;

  • 3. Tarim Branch of Petroleum Engineering Co., Ltd., Sinopec Shengli Oilfield Company, Korla, Xinjiang 841000;

  • 4. College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059

  • Received Date: 2020-11-18
    Abstract
  • A new polymer filter loss reducer CLG-240 was developed for use in water base drilling fluids in ultra-high temperature operations. CLG-240 was synthesized with acrylamide, 2-acrylamide-2-methyl propane sulfonic acid and dimethylaminoethyl methacrylate as the monomers, and 2,2'-azobis[2-methylpropionamidine] dihydrochloride as the initiator through free radical polymerization. Using IR spectroscopy, gel chromatography analysis and thermogravimetric analysis, the molecular structure of CLG-240 was characterized and the relative molecular weight and thermal stability of the synthesized product determined. Comprehensive evaluation of the performance of CLG-240 in water base drilling fluids showed that CLG-240 has a number-average molecular weight of 6.461×105, weight-average molecular weight of 7.345×105. Total thermal loss of weight between room temperature and 315 ℃ is 26.5%, demonstrating that CLG-240 has good high temperature resistance and tolerance. Furthermore, CLG-240 showed good filtration control performance both in freshwater base drilling fluids and saltwater base drilling fluids, as well as good shale inhibitive capacity. Laboratory study showed that CLG-240 is resistant to ultra-high temperatures in drilling fluids; in low density drilling fluids, CLG-240 functions normally at temperature up to 248 ℃, while in high density drilling fluids, this temperature is 220 ℃.

     

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