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CO2-Repurification Microemulsion Detergent for Oil-Based Slurry Cleaning.

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A novel CO2-responsive microemulsion wellbore cleaning fluid was developed using N,N-dimethylcyclohexylamine (DMCHA). This CO2/N2 switching fluid effectively cleans oil-based slurry from simulated wellbores with over 99% efficiency.

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Area of Science:

  • Petroleum Engineering
  • Colloid and Surface Chemistry
  • Environmental Science

Background:

  • Oily wastewater from wellbore operations causes environmental pollution and pipeline blockages.
  • Existing cleaning fluids often lack efficient oil-water separation capabilities and reusability.

Purpose of the Study:

  • To develop a CO2-responsive O/W microemulsion wellbore cleaning fluid with switching characteristics.
  • To address environmental concerns associated with oily wastewater and improve cleaning efficiency.

Main Methods:

  • Formulation of an O/W microemulsion using N,N-dimethylcyclohexylamine (DMCHA) as the oil phase, along with erucamide propyl betaine (EAB-40), sodium dodecyl benzene sulfonate (SDBS), n-butanol, silicone defoamer, and water.
  • Evaluation of microemulsion stability at various temperatures (40 °C and -5 °C).
  • Testing of CO2/N2 switching properties through demulsification and restoration cycles.
  • Assessment of wetting transformation ability on steel and quartz sheets.
  • Determination of cleaning efficiency on simulated oil-based slurry contaminated wellbores.

Main Results:

  • A stable O/W microemulsion with 89.99% water content was successfully prepared.
  • The microemulsion exhibited reversible CO2/N2 switching properties, rapidly demulsifying upon CO2 injection and restoring its state after N2 treatment.
  • The switching microemulsion demonstrated effective wetting transformation.
  • Cleaning efficiency for simulated wellbores contaminated with oil-based slurry exceeded 99%.

Conclusions:

  • The developed CO2-responsive switching microemulsion is a highly effective wellbore cleaning fluid.
  • The system offers an environmentally friendly solution for oily wastewater treatment, enabling oil-water separation at room temperature using CO2.
  • This technology holds significant potential for sustainable oil and gas operations.