表面活性剂-聚合物在科威特砂岩油藏中的可行性从实验室到试验设计的成功集成方法

M. T. Al-Murayri, A. Hassan, I. Hénaut, C. Marliere, A. Mouret, D. Lalanne-Aulet, Juan-Pablo Sanchez, G. Suzanne
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引用次数: 3

摘要

该研究提出了一种综合方法,为科威特一个主要砂岩油藏设计适合用途的表面活性剂-聚合物工艺。所采用的程序描述了通过使用使用实验室结果校准的油藏模拟工具进行先导设计的岩心洪水实验。表面活性剂-聚合物配方设计已经在另一份出版物(SPE-183933)中进行了描述。本文介绍了化学制剂的进一步优化,包括岩心驱油,以尽量减少注入化学制剂的数量,同时保持高采收率。还评价了配方的稳健性及其对表面水油分离的影响。此外,利用油藏模拟设计了现场试验。首先,用于模拟表面活性剂-聚合物性能的参数是根据岩心驱油结果进行校准的。然后,在更大范围内使用油藏模拟模型来确定最适合现场实施的注入顺序。所设计的表面活性剂-聚合物配方具有良好的性能。岩心驱替实验表明,注入该化学配方后,水驱后剩余油采收率达85%以上,吸附值较低。设计的配方也被发现对二价阳离子浓度、水油比和油成分的变化具有相当的弹性。岩石相非均质性对表面活性剂吸附的影响有限。该配方在储层温度附近保持了良好的相行为,在储层温度和表面温度之间表现出良好的水稳定性。利用岩心驱油数据,在油藏模拟模型中校准了EOR参数,包括盐度依赖性表面活性剂吸附、毛细脱饱和度和聚合物诱导的水迁移率降低。更大规模的油藏模拟能够设计出合适的注入顺序,包括一个主要的表面活性剂-聚合物段塞,然后是一个聚合物段塞。设计的主要变量,包括段塞注入持续时间、化学物质浓度和模式尺寸,通过多个敏感性场景进行了优化。使用间距为75米的5点模式,表面活性剂-聚合物注入效果应在大约14个月的短时间内观察到。本文介绍了一种结合实验室实验和油藏模拟的表面活性剂-聚合物工艺设计方法。这项工作为一个主要砂岩储层的5点EOR试验铺平了道路,无疑将为其他类似储层的化学EOR应用提供有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surfactant-Polymer Feasibility for a Sandstone Reservoir in Kuwait. Successful Integrated Approach from Laboratory to Pilot Design
This study presents an integrated approach to design a fit-for-purpose surfactant-polymer process for a major sandstone reservoir in Kuwait. The adopted procedure is described covering core flood experiments through pilot design using a reservoir simulation tool that was calibrated using laboratory results. The surfactant-polymer formulation design was already described in another publication (SPE-183933). In this paper, further optimization of the chemical formulation is described, including core floods to minimize the quantity of the injected chemicals while maintaining high oil recovery. Formulation robustness and its impacts on water-oil separation at the surface are also evaluated. Furthermore, reservoir simulation was utilized to design a field trial. At first, the parameters that were used to model surfactant-polymer performance were calibrated using core flood results. Then, the reservoir simulation model was used at a larger scale to identify the most appropriate injection sequence for field implementation. The performance of the designed surfactant-polymer formulation is promising. Core flood experiments demonstrate that the injection of the chemical formulation recovers more than 85% of the remaining oil after waterflooding, while having relatively low adsorption values. The designed formulation was also found to be quite resilient to variations in divalent cations concentration, water-oil ratio and oil composition. It was noticed that rock facies heterogeneity has a limited effect on surfactant adsorption. Favorable phase behavior properties were maintained around reservoir temperature and the formulation exhibited good aqueous stability between reservoir and surface temperatures. EOR parameters including salinity-dependent surfactant adsorption, capillary desaturation and polymer-induced water mobility reduction were calibrated in the reservoir simulation model using core flood data. Larger scale reservoir simulation enabled the design of a suitable injection sequence including a main surfactant-polymer slug followed by a polymer slug. The main variables of the design, including slug injection durations, chemical concentrations and pattern size were optimized through numerous sensitivity scenarios. Using a 5-spot pattern with a spacing of 75 m, surfactant-polymer injection effects should be observed within a short timeframe of around 14 months. This paper describes a successful approach to design a surfactant-polymer process, integrating laboratory experiments and reservoir simulation. This work paves the way for a 5-spot EOR pilot involving a major sandstone reservoir and will undoubtedly provide valuable insights for chemical EOR applications in similar reservoirs elsewhere.
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