An Integrated Engineering Approach

A. Baghdadi, Souvik Sen, P. Chakrabarti, J. Vossen, Kashif Malik, Ivan Salmin, Munir Bashir, Ahmed Bakr
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Abstract

This study presents a case of successful delivery of a challenging build-up and lateral section through heterogenous lithologies from an exploration field in the Middle East using an integrated multidisciplinary approach of optimization, planning and execution. Based on the offset well drilling experiences, poor ROP, mechanical instability, and differential sticking against some of the highly porous and permeable carbonate reservoirs were identified as the main drilling challenges impacting delivery for the 8-1/2" and 6-1/8" sections parallel to the regional minimum horizontal stress azimuth. Comprehensive geomechanical modeling and wellbore stability analyses were carried out to recommend a safe mud weight window to tackle mechanical instabilities. Utilizing an optimum drill bit design ensured improved durability, trajectory control, a higher rate of penetration and resulted in a 33 % performance improvement on the field average. Drilling fluid chemistry was optimized with required bridging concentrations based on particle size distribution assessment. The 7" liner shoe placement and drilling practices were optimized based on the offset well events and subsurface characteristics to ensure successful execution of the landing section. Real-time monitoring of the LWD data (includes density imaging), aided by right-time geomechanical advisory support ensured successful well delivery without any significant drilling challenges. As a result of the implementation of this systematic and integrated multidisciplinary approach, both sections achieved geological objectives with zero NPT. The well was delivered 8.6 days ahead of the plan, and 14 days ahead of the best similar well.
综合工程方法
本研究介绍了在中东一个勘探油田中,采用优化、规划和执行的多学科综合方法,成功交付穿越异质岩性的具有挑战性的增层和横向剖面的案例。根据偏置井的钻井经验,在与区域最小水平应力方位角平行的 8-1/2" 和 6-1/8" 井段中,ROP 较差、机械不稳定性以及与一些高孔隙度、高渗透性碳酸盐岩储层的差粘是影响交付的主要钻井难题。我们进行了全面的地质力学建模和井筒稳定性分析,提出了解决机械不稳定性的安全泥浆重量窗口。采用最佳钻头设计,确保了更高的耐用性、轨迹控制和更高的穿透率,并在油田平均水平的基础上提高了 33% 的性能。钻井液化学成分根据粒度分布评估结果,按照所需的架桥浓度进行了优化。根据偏移井事件和地下特征,优化了 7 英寸衬垫放置和钻井方法,以确保成功实施着陆段。实时监测 LWD 数据(包括密度成像),并辅以适时的地质力学咨询支持,确保了成功交井,没有遇到任何重大钻井挑战。由于采用了这一系统化的多学科综合方法,两个井段均实现了地质目标,NPT 为零。这口井的交付时间比计划提前了 8.6 天,比最好的同类井提前了 14 天。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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