Smartwater Synergy with Chemical EOR: Studying the Potential Synergy with Surfactants

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
Abdulkareem Sofi, Jinxun Wang, Mathieu Salaün, David Rousseau, Mikel Morvan, Subhash C. Ayirala
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引用次数: 0

Abstract

Summary The potential synergy between smartwater and various enhanced oil recovery (EOR) processes has recently attracted significant attention. In previous work, we demonstrated such favorable synergy for polymer floods not only from a viscosity standpoint but also in terms of wettability. Recent studies suggest that smartwater synergy might even extend to surfactant floods. In this work, we investigate the potential synergy between smartwater and surfactant flooding. Opposed to previous work, the potential synergy is investigated from ground zero. We concurrently developed two surfactant formulations for conventional high-salinity injection water and low-salinity smartwater. To design the optimal surfactant-polymer (SP) formulations, we followed a systematic all-inclusive laboratory workflow. Oil displacement studies were performed in preserved core samples using the two developed formulations with conventional injection water and smartwater. The results demonstrated the promising potential of binary surfactant mixtures of olefin sulfonate (OS) and alkyl glyceryl ether sulfonate (AGES) for both waters. The designed binary formulations were able to form Winsor Type III emulsions besides achieving ultralow interfacial tensions (IFTs). Most importantly, in terms of oil displacement, the developed SP formulations in both injection water and low-salinity smartwater were capable of recovering more than 60% of the remaining oil post waterflooding. A key novelty of this work is that it investigates the potential synergy between smartwater and surfactant-based processes from the initial step of surfactant formulation design. Through well-designed from-scratch evaluation, we demonstrate that surfactant-based processes exhibit limited synergies with smartwater. Comparable processes in terms of performance can be designed for both high-salinity and low-salinity waters. It is also quite possible that the synergistic benefits of smartwater on oil recovery cannot be effective in SP flooding processes, especially with specific surfactant formulations under optimal salinity conditions.
Smartwater与化学EOR的协同作用:研究与表面活性剂的潜在协同作用
最近,智能水与各种提高采收率(EOR)工艺之间的潜在协同作用引起了人们的广泛关注。在之前的工作中,我们不仅从粘度的角度,而且从润湿性的角度,证明了聚合物驱的这种有利协同作用。最近的研究表明,智能水的协同作用甚至可能扩展到表面活性剂驱。在这项工作中,我们研究了智能水和表面活性剂驱油之间的潜在协同作用。与以前的工作相反,潜在的协同效应是从零开始调查的。同时开发了两种用于常规高矿化度注入水和低矿化度智能水的表面活性剂配方。为了设计最佳的表面活性剂-聚合物(SP)配方,我们遵循了一个系统的全面的实验室工作流程。在保留的岩心样品中,使用两种开发的配方,分别使用常规注入水和智能水进行驱油研究。结果表明,烯烃磺酸盐(OS)和烷基甘油醚磺酸盐(AGES)二元表面活性剂混合物在这两种水中都有很好的应用前景。所设计的二元配方能够形成Winsor III型乳剂,并实现超低界面张力(ift)。最重要的是,在驱油方面,开发的SP配方在注水和低矿化度智能水中都能够回收超过60%的水驱后剩余油。这项工作的一个关键新颖之处在于,它从表面活性剂配方设计的初始阶段开始,研究了智能水和表面活性剂工艺之间的潜在协同作用。通过从头开始精心设计的评估,我们证明了基于表面活性剂的工艺与智能水的协同作用有限。在性能方面,可以为高盐度和低盐度水域设计类似的工艺。在SP驱过程中,智能水对采收率的协同效应也很有可能无法发挥作用,特别是在最佳盐度条件下使用特定的表面活性剂配方时。
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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