Setting New Milestones for Coiled Tubing Intervention in Mega-Reach Wells

Edward Jason Wheatley, Gladwin Correia, Samhar Adi, N. Molero, Cremilton Silva, Irma Irais Galvan, G. Mcclelland, A. French, T. Bragaw
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Abstract

Maximizing reservoir contact through extended-reach and mega-reach wells has become a prevalent field development strategy for major offshore operators in the Middle East. This is especially true for the giant oilfield "A", where drilling targets go beyond 40,000 ft. measured depth (MD), with MD/TVD ratios in excess of 4.5:1. Such challenging horizons call for a detailed re-evaluation of well interventions. In 2019, the well surveillance program in the field A required intervention in a mega-reach well with a MD over 35,500 ft. and 4.5:1 MD/TVD ratio. This reach was unthinkable only a few years ago but has been made possible thanks to several recent key technological advancements, such as coiled tubing (CT) equipped with optical fiber and new CT hydraulic tractors, proactive and detailed planning during the drilling phase, the development of highly engineered CT string designs, surface equipment upgrades, and accurate software modeling. The target well is an oil producer with horizontal section beyond 23,000 ft., completed with 6 5/8-in. pre-perforated liner and 23 swellable packers placed across the 8 1/2-in. open hole section. A multiphase production logging tool was selected to assess the production profile along its horizontal drain. With a target depth beyond the reach of conventional wireline, CT equipped with optical fiber emerged as the optimum solution to facilitate reach and overcome the weight and pumping limitations of wired CT. A comprehensive CT reach modeling exercise compared the performance of several 2-in. and 2 3/8-in. CT string designs and identified operational requirements and reach gains from CT hydraulic tractors. As a result, an engineered 2-in. CT tapered string of near 36,700 ft. was developed, capable of being equipped with optical fiber line, while delivering the required flow rate and differential pressure to the CT hydraulic tractor without compromising any operational safety margin. At the time of manufacturing, this was considered the longest CT string ever produced and fitted for downhole telemetry. The operation itself set new records for well interventions in mega-reach wells, with a CT reach above 35,500 ft. MD, including a hydraulic tractoring footage over 15,650 ft. MD with spaced slugs of chemical friction reducer. This case study explains how to develop a safe, robust, and effective solution to mega-reach well challenges using the CT-conveyed optical fiber telemetry technology in one of the deepest wells in the field A, setting a new global record in CT reach. The lessons learned are now the reference for other operators in the Middle East and across the globe for performing interventions in wells that continue to be stretched in its extended reach. It also depicts why telemetry through optical fiber is key to the success of such projects and provides an overview of technology needs for the future of mega-reach well developments.
为大位移井连续油管修井创造新的里程碑
通过大位移井和大位移井来最大化油藏接触面积已经成为中东主要海上运营商普遍采用的油田开发策略。对于大型油田“A”来说尤其如此,该油田的钻井目标深度超过40000英尺(MD), MD/TVD比超过4.5:1。如此具有挑战性的前景要求对油井干预措施进行详细的重新评估。2019年,A油田的油井监测项目要求对一口井进行干预,井深超过35,500英尺,井深/TVD比为4.5:1。仅在几年前,这一范围还是不可想象的,但由于最近几项关键技术的进步,例如配备光纤的连续油管(CT)和新型连续油管液压拖拉机,钻井阶段的主动和详细规划,高度工程化的连续油管管柱设计的发展,地面设备的升级以及精确的软件建模,这一范围已经成为可能。目标井是一口产油井,水平井段超过23000英尺,完井尺寸为6 5/ 8in。预射孔尾管和23个可膨胀封隔器放置在8 - 1/ 2in井眼。裸眼段。选择了多相生产测井工具来评估沿其水平泄油的生产剖面。由于目标深度超出了常规电缆的覆盖范围,因此配备光纤的连续油管成为最佳解决方案,有助于达到目标深度,并克服有线连续油管的重量和泵送限制。一项全面的CT到达模拟练习比较了几种2-in井眼的性能。2又3/8英寸。连续油管管柱设计,确定了作业要求,并从连续油管液压牵引器中获得了收益。因此,设计的2-in。开发了近36700英尺的连续油管锥形管柱,能够配备光纤管线,同时为连续油管液压牵引器提供所需的流量和压差,而不影响任何操作安全边际。在制造时,这被认为是有史以来最长的连续油管管柱,并用于井下遥测。该作业本身也创造了大位移井修井作业的新记录,连续油管深度超过35500英尺,其中液压牵引进尺超过15650英尺,使用了化学减摩剂段塞。本案例研究解释了如何在a油田最深的一口井中使用CT传输光纤遥测技术,开发一种安全、可靠、有效的解决方案,以应对大位移井的挑战,从而创造了CT深度的新纪录。目前,这些经验教训为中东地区和全球其他作业者提供了参考,可供他们在大位移井中进行干预作业。本文还阐述了为什么通过光纤遥测技术是此类项目成功的关键,并概述了未来大位移井开发的技术需求。
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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