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Oil-Water Biphasic Metal-Organic Supramolecular Gel for Lost Circulation Control: Formulation Optimization, Gelation

Qingwang Li1,2,3, Songlei Li4, Ye Zhang1,2

  • 1National Joint Engineering Research Center for Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China.

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Summary

A novel dual-precursor oil-water biphasic metal-organic supramolecular gel (MOSG) offers rapid in situ sealing for oil-based drilling fluid (OBDF) lost circulation zones. This advanced gel exhibits excellent thermal resistance and anti-shear properties, improving wellbore stability.

Keywords:
drilling fluidlost circulation controlmetal–organic supramolecular geloil–water biphasic systemself-healing materialwellbore plugging

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Area of Science:

  • Materials Science
  • Petroleum Engineering
  • Supramolecular Chemistry

Background:

  • Lost circulation in oil-based drilling fluids (OBDFs) is a persistent challenge, with conventional materials lacking compatibility and controllable in situ sealing capabilities.
  • Existing solutions often rely on bridging/packing mechanisms or gel systems designed for aqueous media, which are ineffective in OBDF environments.

Purpose of the Study:

  • To develop and characterize a novel dual-precursor oil-water biphasic metal-organic supramolecular gel (MOSG) for effective in situ sealing in OBDF loss zones.
  • To investigate the gelation mechanism and performance of MOSG under various conditions relevant to drilling operations.

Main Methods:

  • Formulation optimization using specific ratios of oil-phase to aqueous gelling solution and key components (Span 85, TXP-4, NaAlO2).
  • Evaluation of gelation kinetics and stability using apparent viscosity measurements and Attenuated Total Reflectance Fourier-Transform Infrared Spectroscopy (ATR-FTIR) under varying temperature, time, pH, and shear.
  • Comprehensive characterization of MOSG structure and performance through microstructural analysis, thermogravimetric analysis, rheological tests, simulated plugging experiments, and anti-shear evaluations.

Main Results:

  • Optimized MOSG formation is promoted by elevated temperatures (30-70 °C) and mildly alkaline conditions (pH ≈ 8.10-8.30), facilitating P-O-Al coordination and hydrogen bonding.
  • The MOSG exhibits significant viscoelasticity and thermal resistance up to ~193 °C, with over 60% viscosity retention and 70% recovery under high shear (380 rpm).
  • Simulated plugging tests demonstrate MOSG's ability to form a dense sealing layer, achieving a 2.27 MPa/m pressure-bearing gradient in permeable formations and enhancing fracture pressure-bearing capacity.

Conclusions:

  • The developed dual-precursor MOSG provides a highly effective solution for in situ sealing in OBDF lost circulation zones.
  • MOSG's robust performance, including rapid sealing, thermal stability, and shear resistance, makes it a promising material for improving drilling efficiency and wellbore integrity.