研究表面活性剂辅助低盐度水浸对富粘土砂岩的影响

IF 4.2 Q2 ENERGY & FUELS
Saeed Khezerloo-ye Aghdam , Alireza Kazemi , Mohammad Ahmadi
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引用次数: 0

摘要

砂岩储层通常含有粘土颗粒,在低盐度水淹时会造成破坏并降低渗透率。在这项研究中,研究了表面活性剂对富含粘土的砂岩中细粒迁移的影响及其对采油的影响。首先,模拟了表面活性剂对细粒-基质、细粒-细粒和油-基质体系中颗粒间作用力的影响。结果表明,CTAB(十六烷基三甲基溴化铵)和 QS(诃子皂苷)都会导致 EDL 压缩,削弱排斥力。然而,SDS(十二烷基硫酸钠)和 TX(triton X-100)对 EDL 没有影响。接下来,实验研究了表面活性剂对减少 IFT 和改变润湿性的影响。由于表面过度浓缩机制,所有表面活性剂都降低了 IFT。润湿性改变实验表明,虽然 QS 和 CTAB 可压实油和基质颗粒周围的 EDL,从而增强吸引力,但它们都分别通过吸附基质和原油中的羧基来改变润湿性。然而,表面活性剂类型不同,导致采油率提高的机制也不同。CTAB 通过降低 IFT 和改变润湿性使采收率提高了 10%,而 SDS 和 TX 则通过改变润湿性和极度细微迁移使采收率分别提高了 12% 和 9%。相比之下,QS 淹没实验中的部分细微迁移使回收率提高了 18%。实验还记录了渗透率的变化趋势。在注入 CTAB 时,渗透率没有降低,而 QS 水溶液则将岩石渗透率降低到 5 mD。总之,这项研究表明,表面活性剂可以通过改变颗粒间作用力、降低 IFT 和改变润湿性来有效提高富粘砂岩的采油率。研究结果表明,应谨慎选择所使用的表面活性剂类型,以便在不影响储层渗透性的情况下实现理想的提高采收率效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Studying the effect of surfactant assisted low-salinity water flooding on clay-rich sandstones

Sandstone reservoirs often contain clay particles that can cause damage and reduce permeability during low-salinity water flooding. In this study, the effect of surfactants on fine migration in clay-rich sandstones and its impact on oil recovery was investigated.

First, the impact of surfactants on interparticle forces in fine-matrix, fine-fine, and oil-matrix systems was modeled. The results showed that both CTAB (cetyltrimethyl ammonium bromide) and QS (quillaja saponin) cause EDL compaction, weakening the repulsive forces. However, SDS (sodium dodecyl sulfate) and TX (triton X-100) do not affect the EDL. Next, the effect of surfactants on IFT reduction and wettability alteration was experimentally investigated. All surfactants reduced IFT due to the surface excessive concentration mechanism. The wettability alteration experiment illustrated that although QS and CTAB compact EDL around oil and matrix particles leading to attraction force augmentation, they both alter wettability through adsorption on matrix and carboxylic groups present in crude oil, respectively.

Surfactant aqueous solutions were then injected into various clay-rich sandstone sanpacks, which resulted in increased oil recovery. However, the mechanisms leading to enhanced oil recovery variedby surfactant type. CTAB increased recovery by 10% through IFT reduction and wettability alteration, while SDS and TX increased recovery by 12% and 9%, respectively, through wettability alteration and extreme fine migration. In contrast, partial fine migration in the QS flooding experiment reached a recovery increase of 18%. Permeability trends through experiments were also recorded. During CTAB injection, permeability did not reduce, while QS aqueous solution reduced rock permeability to 5 mD. SDS and TX reduced the magnitude of permeability to 2 mD.

In conclusion, this study demonstrates that surfactants can effectively improve oil recovery in clay-rich sandstones by altering the interparticle forces, reducing IFT, and changing wettability. The results suggest that the type of surfactant used should be carefully selected to achieve the desired recovery increase without affecting the permeability of the reservoir.

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来源期刊
Petroleum
Petroleum Earth and Planetary Sciences-Geology
CiteScore
9.20
自引率
0.00%
发文量
76
审稿时长
124 days
期刊介绍: Examples of appropriate topical areas that will be considered include the following: 1.comprehensive research on oil and gas reservoir (reservoir geology): -geological basis of oil and gas reservoirs -reservoir geochemistry -reservoir formation mechanism -reservoir identification methods and techniques 2.kinetics of oil and gas basins and analyses of potential oil and gas resources: -fine description factors of hydrocarbon accumulation -mechanism analysis on recovery and dynamic accumulation process -relationship between accumulation factors and the accumulation process -analysis of oil and gas potential resource 3.theories and methods for complex reservoir geophysical prospecting: -geophysical basis of deep geologic structures and background of hydrocarbon occurrence -geophysical prediction of deep and complex reservoirs -physical test analyses and numerical simulations of reservoir rocks -anisotropic medium seismic imaging theory and new technology for multiwave seismic exploration -o theories and methods for reservoir fluid geophysical identification and prediction 4.theories, methods, technology, and design for complex reservoir development: -reservoir percolation theory and application technology -field development theories and methods -theory and technology for enhancing recovery efficiency 5.working liquid for oil and gas wells and reservoir protection technology: -working chemicals and mechanics for oil and gas wells -reservoir protection technology 6.new techniques and technologies for oil and gas drilling and production: -under-balanced drilling/gas drilling -special-track well drilling -cementing and completion of oil and gas wells -engineering safety applications for oil and gas wells -new technology of fracture acidizing
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