两性降黏剂AVR的性能研究

发布时间：2018-07-20 18:43

【摘要】：为有效提高高黏度、低流度原油的流动性,对具有自主知识产权的两性降黏剂AVR进行了系统的性能研究,考察了碱和聚合物的加入对AVR降黏效果的影响。研究表明,两性降黏剂AVR的降黏效率可达82%以上,能够改变亲油表面润湿性,41秒内可有效剥离亲油表面油膜,体系界面张力可达1.8×10~(-2)m N/m;碱的加入有利于明显改善两性降黏剂AVR的性能,尤其添加Na_2CO_3后,体系降黏率提高到85%以上,剥离油膜时间缩短为10秒,在15分钟内迅速达到油水超低界面张力(小于1.0×10~(-2)m N/m),且随着时间的延长界面张力仍呈现下降趋势;聚合物浓度在100数500 mg/L范围内,两性降黏剂AVR体系的降黏效率达80%以上,体系仍然可达超低界面张力。新型两性降黏剂AVR分子通过缔合作用形成三维网络结构,使溶液具有一定的黏度,可通过地层小孔道起到扩大波及体积的作用。两性降黏剂AVR溶液抗剪切性能良好,高速(5000 r/min)剪切60秒后,黏度保留率达86%;注入性良好,可有效通过0.2μm以上的核孔膜,且黏度保留率在90%以上。
[Abstract]:In order to improve the fluidity of high viscosity and low mobility crude oil, the properties of AVR, an amphoteric viscosity reducer with independent intellectual property rights, were studied systematically. The effects of alkali and polymer on the viscosity reduction of AVR were investigated. The results showed that the viscosity reduction efficiency of Amphoteric viscosity reducer AVR was more than 82%, which could change the wettability of the hydrophilic surface and peel off the oil film effectively within 41 seconds. The interfacial tension of the system can reach 1.8 脳 10 ~ (-2) mn / m, the addition of alkali can obviously improve the properties of AVR, especially after adding Na2CO3, the viscosity reduction rate of the system increases to more than 85%, and the time of stripping oil film is shortened to 10 seconds. The ultra-low interfacial tension of oil and water (< 1.0 脳 10 ~ (-2) mn / m) was rapidly reached in 15 minutes, and the interfacial tension decreased with time, and the viscosity reduction efficiency of AVR system was more than 80% in the range of more than 500 mg / L polymer concentration. The system can still achieve ultra-low interfacial tension. The new amphoteric viscosity reducer AVR molecule forms a three-dimensional network structure through association, which makes the solution have a certain viscosity, and can expand the sweep volume through the formation pore channel. Amphoteric viscosity reducer AVR solution has good shear resistance. After 60 seconds shear at high speed (5000 r/min), the viscosity retention rate is 86%, and the injection property is good, and the viscosity retention rate is more than 90% through the nuclear pore membrane over 0. 2 渭 m.
【作者单位】：中国石油勘探开发研究院提高石油采收率国家重点实验室;
【分类号】：TE39

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