Study on preparation and performance of corrosion and scale inhibitors for layered water injection in low permeability reservoirs of Yanchang Oilfield
In the paper,a quaternary copolymer corrosion and scale inhibitor was synthesized by using acrylic acid(AA),sodium maleic acid(MAH-Na),vinylpyrrolidone(NVP),and self synthesized quaternary ammonium imidazoline(QIM)as monomers.The system was initiated by UV light with diisobutyrate hydrochloride(V50).The optimal monomer ratio was selected through orthogonal experiments as 18∶6∶3.5∶2.5.Combined with static scaling experiments,dynamic corrosion experiments,and molecular weight tests,the optimal synthesis conditions were obtained as follows:V50 dosage of 0.6wt%,reaction time of 8h,monomer concentration of 35wt%.The corrosion inhibition rate of the corrosion and scale inhibitor synthesized under the optimal conditions reached 86.1%,CaCO3 scale inhibition rate reached 91.2%,CaSO4 scale inhibition rate reached 96.1%,and BaSO4 scale inhibition rate reached 73.2%.The performance was evaluated using on-site produced water as an example due to the single corrosion and scale inhibitors purchased in the market.
quad copolymerizationmonomer ratioorthogonal experimentcorrosion and scale inhibitors
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