With optimized molecular size and unique shear-thickening & shear-thinning characteristics, Sodium Methallyl Sulfonate (SMAS) copolymers flow smoothly through tiny pores to guarantee favorable injectability. Meanwhile, they restore high viscosity underground and form steady flow resistance, perfectly matching the working demands of low-permeability reservoir flooding.
- Moderate molecular weight design ensures good injectabilitySMAS copolymers adopt optimized molecular chain length and proper hydrodynamic size. They will not block tiny pore throats of low-permeability formations, flow smoothly through narrow rock pores, and achieve excellent injection performance without causing injection pressure rise.
- Viscoelastic dual property balances seepage and resistanceThe copolymer shows shear thinning behavior under high shear force near injection wells. Its viscosity drops temporarily for easy injection. When entering deep reservoir with low shear environment, viscosity recovers rapidly to rebuild stable flow resistance.
- Sulfonate groups enhance in-situ flow control abilityStrongly hydrophilic sulfonic acid functional groups form stable hydration layers. After entering formation pores, molecules fully stretch and spread, effectively increasing aqueous phase flow resistance, adjusting mobility ratio and improving oil displacement efficiency.
- Appropriate adsorption capacity builds effective resistance zoneSMAS copolymer moderately adsorbs on rock pore surfaces without excessive retention and pore blockage. It stably raises seepage resistance in dominant flow paths, realizes profile control, and does not damage reservoir pore structure.
- Excellent salt-temperature stability maintains stable performanceIt keeps stable molecular conformation in formation water, will not shrink or fail easily. It maintains long-term effective flow resistance in deep low-permeability reservoirs while keeping stable injectability for long-term continuous injection.
