Properties and Oil Displacement Performance of Ternary Sulfonated Modified Polyacrylamide

doi:10.3969/j.issn.1006-6535.2020.04.019

Abstract

Abstract: In order to improve the viscosity reduction of partial hydrolyzing polyacrylamides under high temperature and high salt condition, the ternary sulfonated modified polyacrylamide was synthesized by azo-redox compound initiation system. It also provided the structure characterization, property evaluation and oil displacement performance. Research indicates that the ternary sulfonated polyacrylamide molecules shows a long chain structure and the chains contact and intertwine with each other to form an irregular spatial 3D network structure. Comparing with the partial hydrolyzing polyacrylamides, the ternary sulfonated modified polyacrylamide is characterized by high viscosity, better temperature and salt resistance stability and viscoelasticity. The ternary sulfonated modified polyacrylamide indicates the maximum resistance factor and residual resistance factor, followed by comb polymer, and the partial hydrolyzing polyacrylamide indicates the minimum resistance factor and residual resistance factor. The oil displacement performance from high to low are ternary sulfonated modified polyacrylamide, comb polymer and partial hydrolyzing polyacrylamide. The recovery factor increasing rate of ternary sulfonated modified polyacrylamide decreases with the increase of concentration and temperature and the decrease of salinity. The research was applied to 13 oil production wells in the Block F30 of Shengli Oilfield. The daily oil production was enhanced to 5.2 t/d, the water cut was reduced to 90.4%, and the average cumulative oil increment per well was 685.3 t. This research is of great significance for improving economic benefits and guiding field practice in polymer flooding treatment.

Key words: temperature toleromue and salt resistance, ternary sulfonated modified polyacrylamide, viscoelasticity, seepage pattern, oil displacement performance, Block Gao25

CLC Number:

TE357.46

Wu Peng, Zhang Yue, Niu Yuping, Jiang Ying. Properties and Oil Displacement Performance of Ternary Sulfonated Modified Polyacrylamide[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 123-130.

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