非对称两性Gemini表面活性剂研制及其在低渗油藏CO2泡沫驱中的应用
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江苏油田

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国家自然科学基金“特高温高盐油藏驱油用TTSS系列表面活性剂的开发”(项目编号 51074133)和“稠油流动边界层在水基 泡沫作用下的阻力特征研究”(项目编号 51074136)。


Preparation of asymmetric amphoteric Gemini surfactants and their application in CO2 foam flooding for low permeability reservoirs
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    摘要:

    针对现有商品泡沫驱油剂在高温高盐低渗油藏中起泡量少,泡沫在多孔介质中稳定性差,驱油效率不高的实际问题,通过醚化、季铵化和取代反应,合成了两种非对称两性Gemini表面活性剂(PAHC和PAOC)作为CO2泡沫驱的起泡剂,并通过红外光谱和核磁氢谱确定产物结构。PAHC和PAOC的cmc分别为6.76×10-5 mol/L和5.25×10-5 mol/L,相应的表面张力γcmc分别为31.56 mN/m和30.71 mN/m,它们的Krafft点分别<0℃和<1℃。在江苏油田采油二厂高21-3井组油藏温度80℃和矿化度7704mg/L条件下,对0.4 wt%的PAHC(或PAOC)+0.1 wt% 水杨酸钠+ 0.1%姜磺素接枝马来酸酐共聚物组成的两泡沫体系(PAHC-C16S和PAOC-C18S)进行性能评价。结果表明,在恒定剪切速率170 s-1时, PAHC-C16S和PAOC-C18S起泡体系的耐温分别为81℃和88℃,两体系黏度分别可稳定在6.2 mPa?s和6.4 mPa?s,具有良好的注入性和黏弹性;两种起泡体系PAHC-C16S和PAOC-C18S分别可将油水界面张力降至2.37×10-2 mN/m和1.81×10-2 mN/m。PAOC-C18S泡沫抗温性抗盐性略好于PAHC-C16S泡沫,能满足江苏油田采油二厂高21-3井组CO2泡沫驱要求。岩心驱油实验结果显示,PAHC-C16S和PAOC-C18S起泡体系分别在CO2驱基础上提高平均采收率20.12%和21.91%,可见两起泡体系具有良好的应用前景。

    Abstract:

    In view of the practical problems of existing commercial foams in high temprature, high salinity and low permeability reservoirs, such as low foaming volume, poor foam stability in porous media, and low oil displacement efficiency, two kinds of asymmetric amphoteric Gemini Surfactants (PAHC and PAOC) were synthesized by etherification, quaternization, and substitution reactions as foaming agents for CO2 foam flooding, and the structure of the products was determined by IR and NMR. The CMC of PAHC and PAOC were 6.76 × 10-5 mol/L and 5.25 × 10-5 mol/L, respectively, and the corresponding surface tension γ CMC were 31.56 mN/m and 30.71 mN/m, respectively, and their Krafft points wete >0 ℃ and >1 ℃, respectively, which shows that the two surfactants had good surface properties. Under the conditions of reservoir temperature and salinity of Gao 21-3 well in the Second Oil Production Plant of Jiangsu Oilfield, the performance of two foaming agent systems with two asymmetric amphoteric Gemini surfactants as the main foaming agent were evaluated. The results show that at a constant shear rate of 170 s-1, the temperature resistance of PAHC-C16S and PAOC -C18S foaming systems were 81 ℃ and 88 ℃, respectively, and the viscosity of the two systems can be maintained at 6.2 MPa. s and 6.4 MPa. s, respectively, which showed their had good injection, and the viscoelastic properties of the two foaming systems were also good. The two foaming systems PAHC -C16S and PAOC -C18S could reduce the oil-water interfacial tension to 2.37×10-2 mN/m and 1.81×10-2 mN/m, respectively. The two foams, PAHC-C16S and PAOC-C18S, had good temperature and salt resistance, but the temperature and salt resistance of PAOC -C18S’s foam is slightly better than that of PAHC-C16S’s foam, which can be used in CO2 foam flooding in high temperature and high salinity reservoirs such as Gao 21-3 well in the Second Oil Production Plant of Jiangsu Oilfield. The core oil displacement experiment results show that the average EORs of PAHC-C16S and PAOC-C18S foam systems on the basis of CO2 flooding were 20.12% and 21.91% respectively, which showed that both kinds of foam had good recovery effect.

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  • 收稿日期: 2024-08-16
  • 最后修改日期: 2025-01-03
  • 录用日期: 2025-01-22
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