科威特北部Raudhatain油田,Burgan上部巨型碎屑岩油藏有效注水管理使产量增加了两倍

N. Al-Hajeri, Suresh Chellappan, M. Al-Mufarrej
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摘要

在当前和未来对油气需求不断增长的情况下,多学科综合油藏管理团队是实现最大产量和最终采收率的关键。Raudhatain Upper Burgan油藏于1959年开始生产,初始油藏压力为3850 psi。在持续生产速度下,储层压力下降表明含水层支撑能力较弱,在2001年使用了三个侧翼注入器开始注水。长期以来,石油产量一直保持在30 - 35万桶/天,因此决定进入下一个生产阶段,以实现科威特石油公司的战略生产目标。由地质学家、油藏工程师、岩石物理学家和石油工程师组成的多学科团队仔细审查了各种替代压力生产计划,并确定了瓶颈、限制和行动计划,以解决问题并加速生产。加速生产的一些瓶颈是压力降低,无法获得所需的注入水量,污水注入设施的调试延迟以及具有粘性油的侧井产能低。为了提高产能,综合油藏管理团队启动了一系列项目,例如钻井实践中的范式转换,通过钻水平井、多口井和ICD完井来提高生产和注入效率。清理了在其他油藏(多油藏)中没有潜力的病井,进行水平侧钻至甜点区域。通过改变注水策略和在正确的区域调整注入器,解决了油藏压力降低和空隙替代率降低的问题。结果是令人满意的,在3到4年的时间里,产量从35万桶/天增加到70万桶/天,翻了一番。将生产井转变为注水井的措施增加了注水量,并使空隙置换率提高了一倍。本文介绍了综合油藏管理团队的工作细节,以及克服当前限制使其产量翻倍所采取的举措和战略行动。论述了成熟油田有效的油藏管理,以提高和加快生产。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effective Waterflood Management of a Giant Clastic Upper Burgan Reservoir Leads to Tripling of Production, Raudhatain Field, North Kuwait
In the current and future scenario of increasing demand for hydrocarbons, Multi-Disciplinary Integrated Reservoir Management team is the key to achieve maximum production rates and ultimate recovery. In Raudhatain Upper Burgan reservoir production started in 1959 with initial reservoir pressure of 3850 psi. Decline in reservoir pressure with sustained rate of production indicated weak aquifer support and initiated water injection during the year 2001 with three flank injectors. Production rate was sustained at 30 to 35 MBOPD for long time and it was decided that to go the next level of production and to meet KOC's strategic production target. Various alternative pressures – production plans were scrutinized by the multi-disciplinary team consists of Geologists, Reservoir Engineers, Petrophysicists and Petroleum Engineers and identified bottlenecks, constraints and action plan to address the problems and to accelerate the production. Some of the bottlenecks to accelerate the production were decreasing pressure, unavailability of required volume of water for injection, delay in commissioning of effluent water injection facility and low productivity of flank wells with viscous oil. The integrated Reservoir management team initiated number of projects to increase the productivity like Paradigm shift in drilling practice by way of drilling Horizontal, Multilateral wells and completing with ICD's for better production and injection sweep efficiency. Liquidated the sick wells with no potential in any other Reservoirs (Multiple Reservoirs) are identified for Horizontal Sidetracking to sweet spot areas. Decreasing Reservoir pressure and Voidage Replacement Ratio has been addressed by changing the water injection strategy and aligning the injectors in right areas. The results were rewarding as the production rate doubled from a sustained level of 35 MBOPD to more than 70 MBOPD in a span of 3 to 4 years. The initiatives taken to convert the producers to injectors resulted in increased water injection volume and doubled the Voidage Replacement Ratio. This paper presents the details of Integrated Reservoir Management team efforts and what are the initiatives and strategic actions taken by overcoming the current constraints to double its production. It discusses the effective Reservoir Management of a mature oil field to enhance and accelerate production.
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