在现有限制条件下推进大位移钻井包线的技术与实践

Phalgun Paila, R. Singh, Kashif Abid
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引用次数: 5

摘要

优化资源,突破钻井极限,以最小的成本开发更深的油藏,一直是全球许多运营商的主要目标。此外,当前长期的市场状况正在向参与油井交付过程的每个利益相关者施加压力,以前所未有的方式减少时间和相关成本。本文讨论了一个海上人工岛项目,该项目在大位移钻井(ERD)活动中采用新技术和新实践,不断挑战钻井极限。通过出色的规划和执行,这些大位移井的复杂性得到了有效的管理。新技术和现有技术的实施以及改进的作业实践已经成功应对了设备性能、扭矩和阻力、ECD、井筒稳定性、井眼清洁和避免卡钻等挑战。该项目钻井时间更长,成本更低。这种方法可以在设备额定范围内轻松完成钻井和完井。额外的技术手段,如新开发的润滑剂和机械钻杆减矩短节,有助于降低摩擦系数,消除钻柱屈曲。现有的底部钻具组合(BHA)技术最大限度地减少了井筒的弯曲度,同时传输实时井下钻井数据(扭矩、钻头重量、机械比能和等效循环密度),有助于主动优化钻井参数,提高钻井效率。在下放完井管柱时也采用了类似的技术和实践。在概念阶段进行的地质力学研究,以及随后根据邻井信息进行的修正,有助于在没有相关事件的情况下钻探麻烦的页岩地层。特别重要的是,通过在BHA中安装合适的工具,以适应更高的流量,同时使用串联钻柱来降低液压压力,从而最大限度地提高井眼清洁效果。此外,新制定的针对油田/地层的钻井和扩眼措施最大限度地减少了卡钻,节省了约10%的总井成本。本文讨论了一系列海上ERD井的成功钻井,这些井具有不同的复杂程度,并且在不断修改计划时间和预算的情况下,具有最小的井下问题和量身定制的解决方案。本文将详细介绍大位移井低成本钻井的经验教训和相关技术。这些信息将为所有打算钻大位移井或挑战现有限制条件的利益相关者提供见解和考虑。这种被证明成功的方法及其结果被认为是该地区附近油田的基准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Technologies and Practices to Push The Extended Reach Drilling Envelope within The Existing Constraints
Optimizing resources and pushing the drilling limits to tap into deeper reservoirs at minimal cost has always been the primary objective of many operators worldwide. Moreover, the prolonged current market conditions are pressurizing every stakeholder involved within the well-delivery process to reduce time and the associated costs like never before. This paper deals with an Offshore Artificial Island project where the drilling limits were constantly challenged by adopting new technologies and practices in an extended-reach drilling (ERD) campaign. The complexity of these extended-reach wells was managed effectively with excellent planning and execution. Implementation of new and existing technologies and the adoption of revamped operational practices has managed the challenges of equipment capabilities, torque and drag, ECD, wellbore stability, hole cleaning and stuck pipe avoidance to name a few. The project drilled longer wells at less costs. This approach has resulted in drilling and completion of wells comfortably within the equipment-rating envelope. Additional technological means such as newly developed lubricant and mechanical drill pipe torque reducer subs helped reduce the friction factor and eliminate drill string buckling. Existing technology in the bottom-hole assembly (BHA) minimized the tortuosity in the wellbore, along with transmitted real-time downhole drilling data (Torque, Weight on Bit, Mechanical Specific Energy, and Equivalent Circulating Density) which helped in active drilling parameters optimization for efficient drilling. Similar technologies and practices were used in landing the completion string. The geo-mechanical studies undertaken at the concept stage and later revised against the offset well information helped in drilling the troublesome shale formations with no associated events. Specific importance was given to maximizing the hole cleaning by having the right tools in the BHA that could accommodate higher flow rates while using a tandem drill string for lower hydraulics. In addition, the newly formulated field / formation specific drilling and reaming practices minimized the stuck pipe, saving approximately 10% in overall well costs. This paper discusses the successful drilling of a number of offshore ERD wells with various complexities and tailored solutions with minimal downhole problems and within continuously revising planned times and budgets. The lessons learned and techniques associated with drilling of extended-reach wells at lower costs will be detailed in this paper. This information would give insights and considerations to all stakeholders who intend to drill extended reach wells or challenge their current limiters. This proven successful methodology and its results are considered a benchmark for the nearby fields in the region.
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