Abstract
In order to solve the problem of poor acid-resistant of preformed particle gel (PPG) as conformance control material in reservoirs with supercritical CO2 flooding, acrylamide (AM), N,N′-methylene bisacrylamide (MBA) and dimethyldiallylammonium chloride (DMDAAC) were used to prepare an acid-resistant preformed particle gel (AR-PPG) by radical polymerization method. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the structural property of AR-PPG. The swelling capability, viscoelasticity and shear resistance of AR-PPG in acid environment have been studied. The conformance control system with good dispersion stability was selected and its plugging behavior was studied. The results showed that the swelling ratio of AR-PPG in acid environment was 1.41. Compared with conventional PPG, AR-PPG displayed better swelling capability, shearing resistance and viscoelastic properties in acidic environment. In addition, the conformance control system with good dispersion was 1000 mg/L AR-PPG dispersed in 1000 mg/L cationic polyacrylamide (CPAM) solution. The plugging rate of this conformance control system could be 70.8% in the low permeability micro-fracture core after supercritical CO2 flooding. This work can provide an alternative material for plugging and conformance control in oilfields of supercritical CO2 flooding.
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