低粘度无聚合物缓酸体系——一种新型乳化酸替代品——在西科威特油田的成功应用

S. Al-Sabea, A. Abu-Eida, M. Patra, M. AlEidi, G. Ambrosi, Nakul Khandelwal, Rishi Gaur, Khaled M. Matar, Abdulatif Al wazzan, J. Vasquez
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引用次数: 1

摘要

酸体系被油气行业广泛认为是一种有效增产碳酸盐岩储层的有吸引力的流体。碳酸盐岩酸化处理的主要挑战之一是在实现最小岩面溶蚀的同时,调节酸对储层深处的对流输送。传统的乳化酸受到几个限制的阻碍;高温稳定性低,由于摩擦损失,高粘度限制了泵送速率,潜在的地层损害,以及难以实现均匀的油田规模混合。本文重点介绍了一种不需要聚合物或表面活性剂凝胶化或柴油乳化的工程低粘度缓速酸体系的成功应用。在西科威特油田的一口井中,采用了一种新型的缓速酸系统进行了酸增产作业。该酸体系结合了强矿物酸(即盐酸“HCl”)和非破坏性缓凝剂的使用,可以使活性HCl酸深入地层,从而实现更有效的增产处理。缓凝行为测试包括溶解实验、相容性测试、岩心驱油研究和腐蚀速率测试(在200°F下进行)。作业实施包括使用封隔器在感兴趣的位置精确泵送流体(预冲洗),然后使用定制的新型缓速酸系统来提高射孔处的导流能力和有效的储层增产。该酸体系的特点是具有低粘度和高热稳定性系统,可以在飞行中混合。该方法解决了乳化酸体系的主要挑战,并提供了一种经济高效的解决方案,可广泛应用于需要化学缓速酸体系的基质酸增产和高温条件下。这种新型缓酸系统的应用是一种合适的解决方案,可以通过最大限度地提高油井产量和延长处理效果的寿命来优化投资回报。该新体系还具有优异的阻垢和铁控制性能,无需任何酸补救工作,与其他常规酸体系相比,这是一种经济的方法。本文介绍了碳酸盐岩储层增产后获得的结果,并描述了从作业规划和执行阶段获得的经验教训,可作为其他领域类似挑战的最佳实践。通过正确的候选物选择、最佳放置技术和实验室测试的新型缓速酸体系配方,最终实现了1700桶/天的产油量(比预期高出27%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low Viscosity Polymer Free Acid Retarded System, a Novel Alternative to Emulsified Acid: Successful Application in West Kuwait Field
Acid systems are widely recognized by the oil and gas industry as an attractive class of fluids for the efficient stimulation of carbonate reservoirs. One of the major challenges in carbonate acidizing treatments is adjusting the convective transport of acid deep into the reservoir while achieving a minimum rock face dissolution. Conventional emulsified acids are hindered by several limitations; low stability at high temperatures, a high viscosity that limits pumping rate due to frictional losses, the potential of formation damage, and the difficulty to achieve homogenous field-scale mixing. This paper highlights the successful application of an engineered low-viscosity retarded acid system without the need for gelation by a polymer or surfactant or emulsification by diesel. An acid stimulation job using a new innovative retarded acid system has been performed in a West Kuwait field well. The proposed acid system combines the use of a strong mineral acid (i.e. hydrochloric acid "HCl") with a non-damaging retarding agent that allows deeper penetration of the live HCl acid into the formation, resulting in a more effective stimulation treatment. The retardation behavior testing includes dissolution experiments, compatibility testing, coreflood study, and corrosion rate testing (conducted at 200°F). The on-job implementation included the use of a packer to pinpoint fluid pumping (pre-flush) at the point of interest, followed by the customized novel retarded acid system for improving conductivity at perforations and effective reservoir stimulation. This acid system is characterized by having a low-viscosity and high thermal stability system that can be mixed on the fly. This approach addresses the main challenges of emulsified acid systems and offers a cost-effective solution to cover a wide range of applications in matrix acid stimulation and high-temperature conditions that require a chemically retarded acid system. The application of this novel acid retarded system is a fit-for-purpose solution to optimize the return on investment by maximizing the well production and extending the lifetime of the treatment effect. This new system also offers excellent scale inhibition and iron control properties which eliminates the need for any acid remedial work, making it an economical approach over other conventional acid systems. The paper presents results obtained after stimulating the carbonate reservoir and describes the lessons learned from the job planning and execution phases, which can be considered as a best practice for application in similar challenges in other fields. Proper candidate selection, best available placement technique, and lab-tested formulation of novel retarded acid system resulted in achieving 1700 BOPD of oil production (27% higher than expected).
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