Abstract
Acrylamide polymer, as one type of fluid loss agent (FLA), had attracted a strong interest in the applied petroleum research because of its outstanding characteristics of thickening and filtration control. The aim of this study was to synthesize a series of binary FLA using different acrylamide monomers and analyze the effect of monomer structure on the fluid loss control performance of FLA. Three kinds of FLA with the monomer of 2-acrylamido-2-methyl propane sulfonic acid (AMPS) were prepared by polymerization of AMPS with acrylamide (AM), N,N-dimethyl acrylamide (DMAM), N,N-diethyl acrylamide (DEAM), respectively, and characterized by FTIR, 1H-NMR and 13C-NMR. The results showed that the FLA prepared by AMPS and DMAM (coded as ADM) showed the best water-retaining capacity, which can be attributed to its moderate rigidity group of −CH3. It was also revealed that the tolerance of cement slurry containing ADM to Ca2+ was stronger than that to Mg2+ and Na+.
Highlights
Acrylamide polymer, as one type of fluid loss agent (FLA), had attracted a strong interest in the applied petroleum research because of its outstanding characteristics of thickening and filtration control
The aim of this study was to synthesize a series of binary FLA using different acrylamide monomers and analyze the effect of monomer structure on the fluid loss control performance of FLA
The results showed that the FLA prepared by AMPS and dimethyl acrylamide (DMAM) showed the best water-retaining capacity, which can be attributed to its moderate rigidity group of -CH3
Summary
The FLA consisting of AMPS and AM was prepared by redox free-radical polymerization in a four-necked flask. 35 g of AMPS was dissolved in 300 ml of saturated solution of Ca(OH) with stirring at 25 ± 2 °C. The FLA consisting of AMPS and AM was prepared by redox free-radical polymerization in a four-necked flask. 35 g of AMPS was dissolved in 300 ml of saturated solution of Ca(OH) with stirring at 25 ± 2 °C. After all AMPS was dissolved completely, saturated solution of Ca(OH) was further added into the solution slowly until pH of the solution reached to 10–10.5. 12 g of AM was put into the solution and stirred for 10 min under N2 atmosphere at 60 °C. The reductant (NaHSO3, 0.05 g/ml, 0.9 ml) was dropped into the solution and stirred for 2 min, and the oxidant [(NH4)2S2O8, 0.1 g/ml, 1.6 ml] was added slowly and stirred for 20 min. The addition of reductant and oxidant was repeated successively until viscous product was obtained.
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