三元磺化改性聚丙烯酰胺性能及驱油效果研究

doi:10.3969/j.issn.1006-6535.2020.04.019

摘要/Abstract

摘要： 针对高温高盐条件下部分水解聚丙烯酰胺增黏能力下降的问题,采用偶氮-氧化还原剂复合引发体系合成了三元磺化改性聚丙烯酰胺,并对其进行结构表征、性能评价和驱油效果研究。研究结果表明,三元磺化改性聚丙烯酰胺分子呈长链结构,其链间相互接触、相互缠绕,构成无规则的空间立体网状结构。与部分水解聚丙烯酰胺和梳型聚合物相比较,三元磺化改性聚丙烯酰胺黏度较大,耐温、抗盐性、稳定性和黏弹性更好;三元磺化改性聚丙烯酰胺阻力系数和残余阻力系数最大,其次是梳型聚合物,部分水解聚丙烯酰胺阻力系数和残余阻力系数最小;三元磺化改性聚丙烯酰胺驱油效果最好,其次是梳型聚合物,部分水解聚丙烯酰胺驱油效果最差。随聚合物浓度降低、温度升高和矿化度升高,三元磺化改性聚丙烯酰胺化学驱采收率增幅降低。将研究成果应用于胜利油田F30区块13口采油井,采油井日产油增至5.2 t/d,含水降至90.4%,平均单井累计增油为685.3 t。研究内容对提高聚合物驱经济效益、指导矿场实践具有重要意义。

关键词: 耐温抗盐, 三元磺化改性聚丙烯酰胺, 黏弹性, 渗流特性, 驱油效果, 高25区块

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

中图分类号:

TE357.46

吴鹏, 张跃, 牛玉萍, 蒋莹. 三元磺化改性聚丙烯酰胺性能及驱油效果研究[J]. 特种油气藏, 2020, 27(4): 123-130.

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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