Abstract
Development of the novel retarded acid using in high temperature acidizing and acid fracturing remains an important challenge. Terpolymer-hydrophobically associating polyacrylamide (HA-PAM) with more content of hydrophobic monomer than conventional water-soluble association polymers designed to use as acid thickener was synthesized through aqueous solution polymerization with polymerizable cationic surfactant. The polymer structure was characterized by FT-IR and 1H NMR. The viscous performances in 20 % hydrochloric acid aqueous solution of HA-PAMs synthesized with different amounts of cationic hydrophobic monomer were investigated. The effects of different concentrations of HA-PAM on the viscous performance were also investigated. To further increase the viscosity, a selected surfactant was added to the thickened acid formed by synthesized HA-PAM to form a physically associating acid through micelle and HA-PAM associating interaction. Thickening performance, viscoelasticity, shearing resistance and temperature resistance for physically associating acid was evaluated by Rheometer. The viscosity of physically associating acids formed by the synergy of designed acid thickening polymers and surfactant exceeded 50 mPa·s under 123 °C, which demonstrated the self-assembly acids meet the requirements for high temperature acid fracturing. The designed acid thickening polymers and novel self-assembly acids by physical association have potential applications in high temperature acidizing and acid fracturing.
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