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Development and Performance Evaluation of a Core-Shell Structure Gel Plugging Agent for Ultra-High-Temperature and

Yuhao Xia1, Fengfeng Xiao1, Jun Wang1

  • 1CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu 610051, China.

Gels (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel nano-micron gel plugging agent (LMS) designed for extreme drilling conditions. The LMS agent effectively enhances drilling fluid stability and prevents fluid loss in high-temperature, high-salinity environments.

Keywords:
core–shell structuregel plugging agenthigh-temperature and salt resistancewater-based drilling fluid

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Area of Science:

  • Materials Science
  • Petroleum Engineering
  • Polymer Chemistry

Background:

  • Wellbore stability is critical in deep drilling, challenged by ultra-high temperatures and high salinity.
  • Existing gel plugging agents face performance degradation in harsh downhole environments.
  • Micro-fractures in deep wells exacerbate drilling fluid infiltration issues.

Purpose of the Study:

  • To develop a robust gel plugging agent for high-temperature and high-salinity water-based drilling fluids.
  • To synthesize and characterize a core-shell structured nano-micron gel plugging agent (LMS).
  • To evaluate the performance of LMS in simulated deep well conditions.

Main Methods:

  • Emulsion polymerization was used to synthesize LMS with a specific core-shell structure.
  • Characterization involved infrared spectroscopy, thermogravimetric analysis, TEM, and particle size analysis.
  • Drilling fluid performance was tested after aging at 220 °C under saturated-salt conditions, including filtration loss, microporous membrane, and sand bed tests.

Main Results:

  • LMS demonstrated excellent thermal and salt tolerance, maintaining performance after aging at 220 °C for 16 hours.
  • Drilling fluid with 3 wt% LMS showed a 57.4% reduction in filtration loss compared to the base mud.
  • Core plugging rate reached 95.4% under harsh aging conditions, indicating superior plugging efficiency.

Conclusions:

  • The synthesized LMS gel plugging agent effectively enhances drilling fluid stability and plugging performance in high-temperature, high-salinity conditions.
  • LMS functions by adsorbing onto clay surfaces and synergistically building filter cakes to prevent fluid infiltration.
  • This novel agent offers a promising solution for safe and efficient drilling in challenging deep and ultra-deep formations.