Synthesis And Properties Evaluation Of The Novel Scale Inhibitor

With the rapid development of global economy,the impact of energy on the pace of development of a country is growing and oil as the strategic petroleum resources,plays a crucial role for any country.Scaling problems in the production process of oil has a serious obstacle to the normal oil production,shorten the service life of the oilfield.Increasing research on the scaling inhibitor can bring significant economic benefits for industrial production.The current study found that there was many kinds of pollution water and the most important work of scale inhibition is to control oil field produced water.The most frequently occurring inorganic scale is calcium carbonate scale,calcium sulfate scale,calcium phosphate.Calcium carbonate scale is the most widely distributed in the pipeline scaling.Calcium sulfate scale has dense crystalline and very strong ability of adsorption.Inhibiting calcium carbonate scale and calcium sulfate scale become important and difficult.Currently,adding water treatment agent become the most useful and low costing methods to solve scaling problems.Phosphate ions and calcium ions will produce from Hydrolysis of polyphosphates,it is insoluble calcium phosphate.Organic polyphosphonic acid cannot endure high temperature and can cause environmental pollution during long-term use.So polymeric scale water treatment agent become the focus of future research.In this paper,we successfully synthesized two sulfonic acid group-containing polyol copolymer scale inhibitor AA-APES-HPA and AA-SAS-IA through free radical polymerization,studying the effects of copolymerization synthesis conditions and different environmental conditions on scale inhibitor performances of the copolymer.Polymer structure was characterized by using IR spectroscopy and NMR spectroscopy.Its scale inhibitive performance was evaluated by the static scale inhibition method.The results shown that when reactive monomer molar ratio is 6:2:2,ammonium persulfate mass is 2%of the total mass,the polymerization temperature is 90?,polymerization time is 3 hours,scale inhibitor have a good performance.To strengthen the effect of calcium carbonate scale,we re-design and synthesis a new polymer by introducing Itaconic acid?IA?,improving the content of carboxylic acid group.By using acrylic?AA?,itaconic acid?IA?and allyl sulfonate?SAS?as monomer,we successfully synthesized AA-SAS-IA copolymer Scale Inhibitor.Using orthogonal experimental method to study the optimum conditions of the polymerization process.The results shown that when reactive monomer molar ratio of AA:IA is 1:2,ammonium persulfate mass is 1.2%of the total mass,the polymerization temperature is 90?,polymerization time is 3 hours,scale inhibition rate can reach 95%.Studying the effects of different water condition on the properties of the two polymers,such as the impact of the solution pH,water salinity,water temperature.The test results show that the two inhibitors have good resistance to salinity performance,they have a good performance when the Ca²⁺is 600mg/L.The morphology of calcium carbonate crystals was characterized by scanning electron microscopy?SEM?.Controlled trials showed that calcium carbonate crystals were neatly arranged and angular without scaling inhibitor.On the influence of scaling inhibitor,the crystal were completely destroyed,become loose and easy to be washed away.The research shows that synthetic polymers inhibitors exist multiple mechanisms include:chelating solubilization,dispersion,electrostatic repulsion and lattice distortion.