低渗透微孔油藏解锁与加速开发策略

Kamlesh Kumar, MohamedOsman. Azzazi., A. Hamdi, Zaidi Awang, C. Nicholls, Y. Lawati, H. Huseini, S. Abri, H. Sharji
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引用次数: 1

摘要

Lekhwair上帅坝储层由碳酸盐地层组成,面积非常大(40 km × 40 km)。早期的开发项目发现了较厚、评价良好的地层,并成功进行了注水开发。相比之下,在一些尝试开发未来开发区域的注水试验中遇到了挑战。对这些表现不佳的地区进行综合评估,形成了一份岩石类型目录,列出了不同的岩石类型及其性质。最初的开发主要是在高渗透岩石类型(Rudist Rich和Grainstone)中,而表现不佳的先导则与低渗透(~1 mD)和薄层(2-5m)的微孔岩石有关。这些微孔岩石与大量的碳氢化合物有关。解决这一开发挑战对于维持公司的长期生产目标至关重要。注水开发是首选的开发理念,因为它符合现有的设施和基础设施。现有的试验表明,低注入/吞吐能力是水驱可行性的关键挑战。常规的酸增产在这些地层中不起作用。为了确保微孔资源的成功成熟,除了对注水水质进行监测和改进外,还尝试了四种不同的措施:磨料喷射:用于在储层中创建长达3米的小隧道。可控定向酸喷射:使用酸在储层中形成多个小分支(长度不超过12米)。设计酸:为改善常规酸增产而定制的酸。裂缝对齐扫描技术(FAST)在Halfdan油田的应用这会沿着井的长度产生纵向裂缝。研究成果包括:对整个上帅坝地区的不同岩石类型进行了识别和制图;微孔岩石注水性能评价及新技术试验加快微孔资源开发虽然磨料喷射在提高注入能力方面取得了有限的成功,但设计酸刺激的结果令人失望。另外两项试验仍在评估中。如果所有的措施都不能确定水驱的可行性,则在策略的第二阶段提出替代开发机制。本文强调了不同学科之间的整合如何有助于大型资源量的成熟,同时通过标准化设计加速其发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strategy Towards Unlocking and Accelerated Development of Low Permeability, Microporous Reservoirs
The Upper Shuaiba reservoirs in Lekhwair consist of carbonate formations extending over a very large area (40 km × 40 km). Earlier development projects identified thicker, well-appraised formations, resulting in successful waterfloods. In contrast, challenges have been encountered in some of the waterflood pilots attempting to unlock future development areas. An integrated evaluation of these poor performing areas led to the development of a rock type catalogue that mapped out different rock types and their properties. Initial developments were mostly in high permeability rock types (Rudist Rich and Grainstone) whilst the underperforming pilots are associated with microporous rock characterized by low permeability (~1 mD) and thin formations (2-5m). These microporous rocks are associated with a large hydrocarbon volume in place. Resolving this development challenge is critical in maintaining the company's long-term production targets. Waterflood is the preferred development concept as it is in line with the existing facilities and infrastructure. The existing pilots demonstrate that low water injectivity/throughput is the key challenge to waterflood feasibility. Conventional acid stimulation does not work in these formations. Four different initiatives, in addition to injection water quality monitoring and improvements, are being tried to ensure successful maturation of microporous resources: Abrasive Jetting: used to create small tunnels up to 3m into the reservoir.Controlled Directional Acid Jetting: using acid to create multiple small laterals (up to 12 m in length) into the reservoir.Designer Acid: acid tailored to improve conventional acid stimulation.Fracture Aligned Sweep Technology (FAST) as implemented in Halfdan field; which creates longitudinal fractures along the length of the well. The outcome of this study includes identification and mapping of the different rocktypes across the entire Upper Shuaiba; waterflood performance assessment of microporous rocks and new technology trials to accelerate the development of microporous resources. Whilst abrasive jetting has achieved limited success in improving injectivity, result from designer acid stimulation was disappointing. The other two trials are still under evaluation. In case all the initiatives fail to establish the feasibility of waterflood, alternate developments mechanisms are proposed as Phase 2 in the strategy. This paper highlights how integration between different disciplines can help in maturation of a large resource volume, whilst accelerating its development by standardization of designs.
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