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A Submicron-Scale Plugging Agent for Oil-Based Drilling Fluid Synthesized Using the Inverse Emulsion Polymerization

Zhiquan Zhang1, Baimei Dai1, Peng Xu1

  • 1School of Petroleum Engineering, Yangtze University, Wuhan 430100, China.

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|July 14, 2023
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Summary

A novel nano-scale plugging agent was synthesized for oil-based drilling fluids to address challenges in oil and gas development. This agent effectively reduces filtration loss and improves wellbore stability with minimal impact on fluid properties.

Keywords:
inverse emulsion polymerizationnano-scaleoil-based drilling fluidplugging agentpolymer microspheres

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Area of Science:

  • Materials Science
  • Petroleum Engineering
  • Polymer Chemistry

Background:

  • Challenges in late-stage oil and gas field development include increasing drilling difficulties and the prevalence of micro-pores and micro-fractures.
  • Conventional plugging agents often possess large particle sizes, limiting their effectiveness in sealing micro-scale formations and preventing leakages.

Purpose of the Study:

  • To synthesize and characterize a nano-scale plugging agent for oil-based drilling fluids.
  • To evaluate the performance of the synthesized plugging agent under various downhole conditions, including high temperature and pressure.
  • To assess the agent's impact on drilling fluid properties and its efficacy in reducing permeability.

Main Methods:

  • Inverse emulsion polymerization was employed using acrylamide, 2-acrylamide-2-methylpropane sulfonic acid, and acrylic acid as monomers.
  • Characterization involved infrared spectroscopy, scanning electron microscopy, and thermogravimetry analysis to determine morphology and thermal stability.
  • Performance evaluation included rheological property testing, filtration loss measurements, and core-plugging experiments under simulated downhole conditions.

Main Results:

  • The synthesized plugging agent exhibited spherical, uniform submicron particle sizes and demonstrated strong temperature resistance.
  • Addition of the plugging agent did not significantly alter the basic rheological properties of the oil-based drilling fluid.
  • Filtration loss was substantially reduced under both normal and high-temperature/high-pressure conditions after aging, with a 96.04% reduction in pore core permeability at 3% concentration.

Conclusions:

  • The developed nano-scale plugging agent effectively seals micro-pores and micro-fractures, significantly reducing filtration loss in oil-based drilling fluids.
  • The agent enhances wellbore stability and shows promising potential for practical application in oil and gas field operations.
  • The synthesized material offers a viable solution for improving drilling efficiency in challenging reservoirs.