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首页> 外文期刊>The Journal of Supercritical Fluids >Thickening compressed liquid and supercritical propane with bisurea DMHUT N,N '-(4-methyl-1,3-phenylene)bis[N-(1,5-dimethylhexyl)urea] for enhanced oil recovery or waterless hydraulic fracturing
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Thickening compressed liquid and supercritical propane with bisurea DMHUT N,N '-(4-methyl-1,3-phenylene)bis[N-(1,5-dimethylhexyl)urea] for enhanced oil recovery or waterless hydraulic fracturing

机译：具有Bisurea DMHUT N，N' - （4-甲基-1,3-亚苯基）BIS [N-（1,5-二甲基己基）脲]的增稠压缩液体和超临界丙烷用于增强的采油或无水液压压裂

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摘要

N,N'-(4-Methyl-1,3-phenylene)bis(N-(1,5-dimethylhexyl)ureal or DMHUT, a low molecular weight bisurea with branched alkyl substituents, is capable of thickening high-pressure propane, which could lead to improvements in its performance during miscible enhanced oil recovery and waterless hydraulic fracturing. DMHUT dissolves in supercritical propane upon heating to 115 degrees C at high pressure (34.5 MPa). Upon cooling to temperatures as low as 25 degrees C the solution remains a transparent, stable, single phase that exhibits remarkably high viscosity. For example, at a mass fraction of 0.5 wt% at 40 degrees C and 34.5 MPa, falling ball viscometry indicates that the bisurea-propane solution is more than 400 times as viscous than pure propane. The thickening efficiency of DMHUT has been found to be superior under most conditions to other small associative molecules and polymers known to thicken propane: tributyltin fluoride, hydroxyaluminum di(2-ethylhexanoate), ultra-high molecular weight poly alpha-olefin, or conventional crosslinked phosphate esters based on long-chain alkyl-substituted phosphate esters.
机译：N，N' - （4-甲基-1,3-亚苯基）双（N-（1,5-二甲基己基）尿胃或Dmhut，具有支链烷基取代基的低分子量双脲，能够加厚高压丙烷，这可能导致其在混溶性增强的采油和无水液压压裂过程中的性能提高。DMHUT在高压（34.5MPa）的加热至115℃时溶解在超临界丙烷。冷却至低至25℃的温度下溶液仍然存在透明，稳定，单相，表现出显着的高粘度。例如，在40℃和34.5MPa的质量分数为0.5wt％和34.5MPa，下降的球粘度率表明双脲 - 丙烷溶液比粘性的400倍以上纯丙烷。已发现Dmhut的增稠效率在大多数条件下为其他小缔约置分子和增稠丙烷已知的聚合物的优异效率优越：氟化丁蛋白，羟铝二（2-乙基己酸酯），超高分子魏基于长链烷基取代的磷酸酯的GHT聚α-烯烃或常规的交联磷酸酯。

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