ArticleGels (Basel, Switzerland)2026
Preparation and High-Temperature Fracture-Sealing Performance of an Oil-Absorbing Swelling Gel for Lost-Circulation Control in Oil-Based Drilling Fluids.
Article in Gels (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Lost circulation in fractured formations remains challenging for oil-based drilling fluids because conventional rigid bridging materials can be sensitive to fracture geometry and form porous seals. In this study, an oil-absorbing swelling gel plugging agent (OSGP) was prepared by water-in-oil emulsion free-radical polymerization. Its oil-induced swelling, strain-dependent viscoelasticity, and bidirectional fracture-sealing behavior were evaluated together with morphology and thermal mass-loss behavior. After 12 h in white oil at 120 °C, the particle volume increased by 19.2%. At 25 °C, OSGP showed an elastic-dominant response with strain-induced softening. In independent fracture-sealing tests at 120 °C, OSGP formed pressure-bearing seals in both 3 mm parallel and 3 mm-to-1 mm wedge-shaped steel fractures, with a maximum forward breakthrough pressure of 8.06 MPa. Comparison of forward and reverse tests showed that fracture geometry and flow direction strongly affected pressure-bearing behavior. The combined results support a proposed sealing process involving particle bridging, oil-induced swelling, deformation, and compaction. OSGP therefore shows potential for further evaluation as a lost-circulation material in fully formulated oil-based drilling fluids and rock fractures.
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