针对现有商品泡沫驱油剂在高温高盐低渗透油藏中起泡量少、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CO_(2)泡沫驱的起泡剂,将合成的产物...针对现有商品泡沫驱油剂在高温高盐低渗透油藏中起泡量少、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CO_(2)泡沫驱的起泡剂,将合成的产物作为主起泡剂构建一种CO_(2)泡沫驱油体系,评价了该体系的界面活性、耐温耐剪切性、黏弹性、泡沫性能等,并进行了驱替实验。结果表明,PAHC和PAOC的临界胶束浓度c_(cmc)分别为6.76×10^(-5)和5.25×10^(-5)mol/L,对应的表面张力γ_(cmc)分别为31.56和30.71 m N/m。PAHC和PAOC的Krafft点分别低于0℃、1℃。在江苏油田采油二厂高21-3井组油藏温度为80℃、矿化度为7704 mg/L条件下,在恒定剪切速率170 s^(-1)时,0.4%PAHC(或PAOC)+0.1%水杨酸钠+0.1%姜磺素接枝马来酸酐共聚物的PAHC-C_(16)S、PAOC-C_(18)S泡沫体系,耐温分别为81℃和88℃,黏度分别可稳定在6.2和6.4 m Pa·s,具有良好的注入性和黏弹性。PAHC-C_(16)S、PAOC-C_(18)S泡沫体系分别可将油水界面张力降至2.37×10^(-2)和1.81×10^(-2)m N/m。PAOC-C_(18)S泡沫抗温性、抗盐性略好于PAHC-C_(16)S泡沫,能满足江苏油田采油二厂高21-3井组CO_(2)泡沫驱要求。岩心驱油实验结果显示,PAHC-C_(16)S和PAOC-C_(18)S起泡体系分别在CO_(2)驱基础上提高平均采收率20.12百分点和21.91百分点,可见两种起泡体系具有良好的应用前景。展开更多
Cationic Gemini surfactants, alkanediyl-α ,ω- bis(dimethyl dodecylammonium bromide) have been synthesized by the following method: firstly dodecyl bromide was prepared by the reaction of dodecanol with bromic acid i...Cationic Gemini surfactants, alkanediyl-α ,ω- bis(dimethyl dodecylammonium bromide) have been synthesized by the following method: firstly dodecyl bromide was prepared by the reaction of dodecanol with bromic acid in the presence of strong sulfuric acid. Dodecylbromide was then reacted with N,N- tetramethyl ethane diamine(or N,N- tetramethyl hexana diamine) to prepare the title- compounds. Micellization of these Gemini surfactants was investigated using conductivity measurement. The results showed that the critical micelle concentration(cmc) of the Gemini surfactants has a much lower value compared with that of the corresponding " monomer" . For a series of the Geminis with the same length(s) in the spacer chain, the cmc decreased with increasing the carbon number (m) in the alkyl chain. The aggregation number(N) of the micelle also drastically decreased with m. For the same value of m, the cmc varied slightly with s, which indicated that the electrostatic interaction between the ionic- groups of the " monomer" has been naturally changed duo to a link between the two ionic- groups of the " monomer" through a spacer. However, N was strongly decreased with s,which may be a reason of steric inhibition coming from the ionic- groups due to a link of spacer. With increasing temperature, micellization of the Gemini surfactants was slightly enhanced.展开更多
文摘针对现有商品泡沫驱油剂在高温高盐低渗透油藏中起泡量少、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CO_(2)泡沫驱的起泡剂,将合成的产物作为主起泡剂构建一种CO_(2)泡沫驱油体系,评价了该体系的界面活性、耐温耐剪切性、黏弹性、泡沫性能等,并进行了驱替实验。结果表明,PAHC和PAOC的临界胶束浓度c_(cmc)分别为6.76×10^(-5)和5.25×10^(-5)mol/L,对应的表面张力γ_(cmc)分别为31.56和30.71 m N/m。PAHC和PAOC的Krafft点分别低于0℃、1℃。在江苏油田采油二厂高21-3井组油藏温度为80℃、矿化度为7704 mg/L条件下,在恒定剪切速率170 s^(-1)时,0.4%PAHC(或PAOC)+0.1%水杨酸钠+0.1%姜磺素接枝马来酸酐共聚物的PAHC-C_(16)S、PAOC-C_(18)S泡沫体系,耐温分别为81℃和88℃,黏度分别可稳定在6.2和6.4 m Pa·s,具有良好的注入性和黏弹性。PAHC-C_(16)S、PAOC-C_(18)S泡沫体系分别可将油水界面张力降至2.37×10^(-2)和1.81×10^(-2)m N/m。PAOC-C_(18)S泡沫抗温性、抗盐性略好于PAHC-C_(16)S泡沫,能满足江苏油田采油二厂高21-3井组CO_(2)泡沫驱要求。岩心驱油实验结果显示,PAHC-C_(16)S和PAOC-C_(18)S起泡体系分别在CO_(2)驱基础上提高平均采收率20.12百分点和21.91百分点,可见两种起泡体系具有良好的应用前景。
文摘Cationic Gemini surfactants, alkanediyl-α ,ω- bis(dimethyl dodecylammonium bromide) have been synthesized by the following method: firstly dodecyl bromide was prepared by the reaction of dodecanol with bromic acid in the presence of strong sulfuric acid. Dodecylbromide was then reacted with N,N- tetramethyl ethane diamine(or N,N- tetramethyl hexana diamine) to prepare the title- compounds. Micellization of these Gemini surfactants was investigated using conductivity measurement. The results showed that the critical micelle concentration(cmc) of the Gemini surfactants has a much lower value compared with that of the corresponding " monomer" . For a series of the Geminis with the same length(s) in the spacer chain, the cmc decreased with increasing the carbon number (m) in the alkyl chain. The aggregation number(N) of the micelle also drastically decreased with m. For the same value of m, the cmc varied slightly with s, which indicated that the electrostatic interaction between the ionic- groups of the " monomer" has been naturally changed duo to a link between the two ionic- groups of the " monomer" through a spacer. However, N was strongly decreased with s,which may be a reason of steric inhibition coming from the ionic- groups due to a link of spacer. With increasing temperature, micellization of the Gemini surfactants was slightly enhanced.
