耐温抗盐疏水缔合聚合物的制备与性能评价
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国家科技重大专项“高温高盐油田化学驱提高采收率技术”(项目编号2016ZX05011-003)


Preparation and Performance Evaluation of Hydrophobically Associating Polymer with Temperature Resistance and Salt Tolerance
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    摘要:

    传统的聚合物驱油剂难以满足耐温耐盐和长期老化热稳定性的要求。以N-苯乙基-N-十二烷基甲基丙烯 酰胺(PEDMAM)为疏水单体、2-甲基-2-丙烯酰胺基丙磺酸(AMPS)为功能单体,与丙烯酰胺(AM)共聚制备了水 溶性疏水缔合聚合物PSA,考察了最优单体(AM、AMPS、PEDMAM)质量比为83∶15∶2时共聚物的综合性能。 结果表明,与传统的部分水解聚丙烯酰胺(HPAM)相比,三元共聚物PSA具有良好的增黏性能、耐温耐盐性、抗 剪切性、老化稳定性及驱油性能。在85 ℃和32 g/L矿化度(钙镁质量浓度800 mg/L)条件下,1500 mg/L PSA溶 液的黏度为16.3 mPa·s;在85 ℃无氧条件下老化60 d后的黏度保留率>80%。室内岩心驱替实验表明,0.7 PV 1500 mg/L PSA可在水驱基础上提高采收率35.05%,比相近黏度的HPAM(3000 mg/L)高12.35百分点,具有明显 的驱油优势。

    Abstract:

    It is very difficult for the conventional polymer flooding agent to meet the requirements of temperature resistance,salt tolerance and long-term aging thermal stability. The water-soluble hydrophobically associating polymer(PSA)was prepared by the copolymerization with acrylamide(AM)using N-phenethyl-N-dodecylmethacrylamide(PEDMAM)as associative monomer and 2- acrylamide- 2- methylpropanesulfonic acid(AMPS)as functional monomer. In addition,the comprehensive properties of PSA prepared at an optimum monomer(AM∶AMPS∶PEDMAM)mass ratio of 83∶15∶2 were investigated. The results showed that, compared with partially hydrolyzed polyacrylamide(HPAM),PSA had good tackifying capacity,temperature resistance,salt tolerance,shear resistance,aging stability and oil displacement performance. Under the condition of 85 ℃ and 32 g/L salinity with 800 mg/L the mass concentration of Ca2+ and Mg2+,the viscosity of 1500 mg/L PSA solution was 16.3 mPa· s,and the retention rate of viscosity was more than 80% after anaerobic oxygen aging for 60 days at 85 ℃ . Moreover,the results of laboratory core displacement experiment showed that 0.7 PV 1500 mg/L PSA could further enhance the oil recovery by 35.05% over water injection,which was greater than that of 3000 mg/L HPAM with similar viscosity by 12.35 percentage points. PSA had significant advantage in oil displacement.

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  • 在线发布日期: 2021-07-06
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