Cost Advantage Mechanism of SMAS-based Polymers in Middle and Late Oil Production

Although the monomer price of Sodium Methallyl Sulfonate (SMAS) is slightly higher than acrylamide, SMAS‑based polymers show outstanding advantages in cost control during middle and late oil production.

1. High reservoir adaptability and high effective utilization
   With stable sulfonate groups and methyl steric hindrance structure, SMAS copolymers present excellent temperature resistance, salt resistance and alkali resistance. It maintains stable performance under harsh formation conditions, reduces rapid degradation and viscosity loss, and extends the effective service life of chemical agents.
2. Less auxiliary additives and lower formula cost
   Conventional acrylamide polymers require additional stabilizers and anti‑salt additives to adapt to complex reservoirs. SMAS modified polymers possess inherent structural stability, which simplifies the formula and cuts the procurement and compounding cost of auxiliary chemicals.
3. Long-term deep regulation and reduced operation frequency
   SMAS polymers have good injectivity and deep migration performance. It realizes long‑term in‑depth profile control and fluid diversion, avoids frequent repeated injection and construction, and greatly saves labor, equipment and field operation costs.
4. Reduced hidden maintenance and treatment cost
   Conventional polymers are easy to degrade and produce residual colloids, causing formation damage and heavy produced water treatment pressure. SMAS systems feature stable crosslinking and controllable degradation, lowering sewage treatment, pipeline maintenance and reservoir remediation costs.
5. Higher oil recovery and better economic benefit
   Good compatibility with surfactants and alkali ensures lasting low interfacial tension and enhanced oil displacement efficiency. Stable production and incremental oil output effectively reduce the comprehensive chemical cost per barrel of crude oil.