Abstract
A novel acidizing additive is developed to improve acidizing effectiveness, especially to solve the problems during acidizing process, like rapid acid-rock reaction rate etc. The monomer was synthetized by Mannich reaction. Experimental results indicate that the optimum conditions are: mass ratio 18.5:8:14 of formaldehyde to amine A and phosphorus B, reaction temperature 90°C, reaction time 14h, polymerization inhibitor hydroquinone dosage 0.25%, under which the degree of conversion amounts to 91%. Infrared spectrum shows the feasibility of synthesis scheme. Then the monomer copolymerized with AMPS under the conditions: mass ratio 24.2:4 of monomer to AMPS, reaction temperature 80°C, reaction time 1h, monomer concentration 40%, and initiator dosage 2.0%. The corrosion and secondary precipitate performance of the retarded acid system was investigated. The results indicate that this operating fluid has superior retarding effectiveness and excellent secondary precipitate behavior. By core displacement experiment, the excellent retarding property of the retarded acid was further confirmed.
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