Volume 38 Issue 5
Sep.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(5): 552-559
WANG Guoshuai, JIANG Guancheng, HE Yinbo, et al.Synthesis and evaluation of a ph stimulus-responsive high temperature-resistant reversible emulsifier[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：552-559 doi: 10.12358/j.issn.1001-5620.2021.05.003
Citation: WANG Guoshuai, JIANG Guancheng, HE Yinbo, et al.Synthesis and evaluation of a ph stimulus-responsive high temperature-resistant reversible emulsifier[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：552-559 doi: 10.12358/j.issn.1001-5620.2021.05.003
shu

Synthesis and Evaluation of A pH Stimulus-responsive High Temperature-resistant Reversible Emulsifier

doi: 10.12358/j.issn.1001-5620.2021.05.003
  • 1.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249

  • 2.

    MOE Key Laboratory of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249

  • Received Date: 2021-07-01
  • Accepted Date: 2021-06-17
  • Publish Date: 2021-09-30
    Abstract
  • The oil-based drilling fluid presences the problems of difficulty to remove filter cake and treat oily cuttings. Based on the intelligent regulation mechanism of the pH stimulus-responsive emulsifier on the emulsion type, a pH-responsive reversible emulsifier RE-HT was synthesized through Hoffman reaction with 1-Bromo long-chain Alkane R and Diethanolamine to solve these problems. And a reversible emulsion drilling fluid was developed by utilizing it as the core agent. The infrared spectroscopy analysis and emulsion acid/base thixotropy test showed that the synthesized product contains the pH-responsive tertiary amine group and can be flexibly switched between water-in-oil emulsifier and oil-in-water emulsifier under acid/alkali stimulation. Thermogravimetric analysis and electric stability tests showed that the initial thermal decomposition temperature of RE-HT in an air atmosphere is as high as 257 ℃, and the demulsification voltage of the basic emulsion with 5% RE-HT is 1098 V after aging at 220 ℃. This indicated that it has good thermal stability and emulsifying performance. The developed reversible emulsion drilling fluid has good basic performance and can tolerate high-temperature up to 200 ℃, saturated saltwater contamination up to 15%, and drilling cuttings contamination up to 15%. The filter cake removal rate after pickling is 98.98%, the oil content of cuttings after pickling is less than 1%, EC50 is 2.05×105 mg/L, meeting the cuttings discharge standard and exhibiting a good application prospect in complex deep wells drilling.p wells drilling.

     

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