SMAS-based scale inhibitors possess superior thermal stability and high-salinity resistance. They avoid thermal hydrolysis failure of common phosphonates, contain no phosphorus to prevent secondary phosphate scale, and keep stable chelating and dispersing performance, making them ideal for high-temperature high-salinity oilfield water injection systems.
- Thermal stability difference
Conventional phosphonate scale inhibitors are prone to thermal decomposition and hydrolysis under high temperature, losing scale inhibition activity and easily forming phosphate scale. By contrast, SMAS copolymer has stable molecular structure, resists high-temperature degradation and maintains stable performance in deep well high-temperature water injection conditions. - Stronger anti-salinity and ion tolerance
Phosphonates are easily affected by high-valent metal ions and high salinity, leading to efficacy decline and precipitation failure. SMAS carries high-polarity sulfonate groups with outstanding salt resistance, its molecular chain will not curl and fail under high TDS, and it can still exert good chelation and dispersion effects. - No secondary scale riskPhosphorus-containing agents will introduce phosphate radicals, which are easy to combine with calcium ions to generate secondary calcium phosphate scale and aggravate pipeline blockage. SMAS-based products contain no phosphorus elements, avoid secondary scaling pollution, and are more friendly to reservoir formation.
- Better compatibility with oilfield water quality
SMAS copolymer has excellent compatibility with produced water and injected water, and will not react with chemical additives in the water system to produce sediments. It is suitable for complex water quality in oilfield water injection. - Long-lasting threshold scale inhibition effect
It maintains efficient lattice distortion and particle dispersion ability under harsh working conditions, effectively inhibit barium sulfate, strontium sulfate and carbonate scales, with longer effective duration than traditional phosphonate agents.
Sodium methallyl sulfonate (SMAS) is a water-soluble monomer used in acrylic fibers and polycarboxylate superplasticizers.
Sodium Methallyl Sulfonate
Abbreviation: SMAS / MAS
CAS No.: 1561-92-8
Molecular Formula: C₄H₇NaO₃S
Molecular Weight: 158.16
