Role of Surfactant Structures on Surfactant-Rock Adsorption in Various Rock Types

Daniel Wilson, Laurie Poindexter, Thu T. Nguyen
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引用次数: 4

Abstract

Adsorption of surfactant onto rock surfaces is dependent upon a number of factors, including characteristics of both the adsorbent and surfactant molecules. Considering that surfactant-based unconventional means to improve oil recovery are strongly dependent on the interaction at the liquid/liquid interface between soluble surfactant solution and crude oil, loss of surfactant to liquid/solid interfaces can create a negative effect for some of these applications in terms of performance and economics. This study; therefore, focuses on investigating the adsorption mechanism of surfactants onto sandstone and limestone reservoir media. Besides quantifying how much surfactant is adsorbed, emphasis specifically on the effect of surfactant parameters on the adsorption capacity was evaluated. Although literature well documents that mineralogy, temperature, pH, inclusion of other chemicals, and salinity all play strong roles on the adsorption capacity of surfactants on a solid surface; all of these parameters, with exception of mineralogy, were maintained as constants for this work. Anionic alcohol propoxy sulfate, nonionic alcohol ethoxylate, and ether carboxylate surfactants were studied. Academic focus for this effort was placed on surfactant parameters being evaluated including the structure of the surfactant hydrophilic head group and the surfactant hydrophobic tail. The number of mechanisms involved in surfactant loss from aqueous solutions to assorted porous media adds to the complexity of this phenomenon. Experimental results show that various surfactant parameters affect the adsorption differently based on their interaction with different adsorbents. An increase in hydrophobicity appears to increase surfactant adsorption. This was observed through a number of different mechanisms including increasing percent of propylene oxide (PO) and increasing degree of hydrophobe branching of the surfactants. Conversely, increasing carbon chain length and keeping the percent of PO more constant appeared to show a general decrease in adsorption trend with alcohol propoxy sulfate and a discernible decrease in adsorption in sandstone versus limestone mineralogy. It was also observed that varying ratios of propylene oxide and ethylene oxide extensions to alcohol alkoxy sulfate molecules will have an influence on surfactant adsorption. Surfactant properties provide information on the type and mechanism of interactions involving surfactant molecules at the solid/liquid interface and their efficiency as surface-active agents. The findings from this study can be used to improve understanding on how the role of different surfactant parameters may affect surfactant adsorption. This will help lead to enhancements in designing surfactant molecular structures that in turn minimize adsorption to rock surfaces, while maintaining desired fluid performance for effective oil recovery.
表面活性剂结构对不同岩石类型表面活性剂-岩石吸附的作用
表面活性剂在岩石表面的吸附取决于许多因素,包括吸附剂和表面活性剂分子的特性。考虑到基于表面活性剂的非常规采收率方法在很大程度上依赖于可溶表面活性剂溶液与原油在液/液界面的相互作用,表面活性剂在液/固界面的损失可能会对某些应用的性能和经济性产生负面影响。本研究;因此,重点研究表面活性剂在砂岩和灰岩储层介质上的吸附机理。除了量化表面活性剂的吸附量外,还着重评价了表面活性剂参数对吸附量的影响。虽然文献很好地证明了矿物学、温度、pH、其他化学物质的包含和盐度都对表面活性剂在固体表面的吸附能力有很强的影响;除矿物学参数外,所有这些参数在本工作中均保持为常数。研究了阴离子型硫酸丙氧基醇、非离子型乙氧基醇和醚型羧酸盐表面活性剂。学术界的研究重点是表面活性剂的参数,包括表面活性剂亲水头基团和表面活性剂疏水尾的结构。表面活性剂从水溶液流失到各种多孔介质的机理增加了这一现象的复杂性。实验结果表明,表面活性剂的不同参数对吸附效果的影响取决于它们与不同吸附剂的相互作用。疏水性的增加似乎增加了表面活性剂的吸附。这是通过许多不同的机制观察到的,包括增加环氧丙烷(PO)的百分比和增加表面活性剂的疏水分支的程度。相反,增加碳链长度和保持PO的百分比更恒定,似乎表明醇丙氧基硫酸盐的吸附总体呈下降趋势,并且在砂岩中吸附明显减少,而在石灰岩矿物中则明显减少。还观察到环氧丙烷和环氧乙烷与醇烷氧基硫酸盐分子延伸的不同比例对表面活性剂的吸附有影响。表面活性剂的性质提供了表面活性剂分子在固/液界面上相互作用的类型和机制以及它们作为表面活性剂的效率的信息。本研究结果可用于进一步了解不同表面活性剂参数对表面活性剂吸附的影响。这将有助于改进表面活性剂分子结构的设计,从而最大限度地减少对岩石表面的吸附,同时保持所需的流体性能,从而实现有效的采油。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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