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<p>To address the short effective duration of conventional scale inhibitors in mature oilfields, hydroxyethyl diphosphonic acid (HEDP) / Methyl methacrylate (PMMA) submicron capsule were engineered via reverse microemulsion evaporation for sustained release. Optimized synthesis (core-wall ratio 1:6, Span80/W ratio 1:2, 3.5&#xa0;h curing) achieved 95.3% encapsulation efficiency. The submicron capsule maintained 70–90% scale inhibition efficiency against CaCO₃ over 8&#xa0;h. Flow tests demonstrated exceptional retention: submicron capsule withstood &gt; 860 pore volumes (PV) before breakthrough, outperforming liquid inhibitors (160 PV) by 5.4-fold. Pretreatment with Cetyltrimethylammonium(CTAB) bromide further enhanced adsorption. Crucially, mechanistic studies revealed surface charge (zeta potential) as the dominant retention controller, while particle size showed negligible influence. This study proposes a surface-charge-dominated retention strategy for long-term scale inhibition in oilfields, which may contribute to more sustained scale control.</p>

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Synthesis of HEDP/PMMA Submicron Capsules for Long-Term Scale Inhibition in Oil Reservoirs

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Hui Ming,
  • Xuefeng Li,
  • Zhentao Sha,
  • Yuhe Xiang,
  • Yi Liu,
  • Yang Li,
  • Mei Wu

摘要

To address the short effective duration of conventional scale inhibitors in mature oilfields, hydroxyethyl diphosphonic acid (HEDP) / Methyl methacrylate (PMMA) submicron capsule were engineered via reverse microemulsion evaporation for sustained release. Optimized synthesis (core-wall ratio 1:6, Span80/W ratio 1:2, 3.5 h curing) achieved 95.3% encapsulation efficiency. The submicron capsule maintained 70–90% scale inhibition efficiency against CaCO₃ over 8 h. Flow tests demonstrated exceptional retention: submicron capsule withstood > 860 pore volumes (PV) before breakthrough, outperforming liquid inhibitors (160 PV) by 5.4-fold. Pretreatment with Cetyltrimethylammonium(CTAB) bromide further enhanced adsorption. Crucially, mechanistic studies revealed surface charge (zeta potential) as the dominant retention controller, while particle size showed negligible influence. This study proposes a surface-charge-dominated retention strategy for long-term scale inhibition in oilfields, which may contribute to more sustained scale control.