7in Enhanced Single-Trip Multizone System ESTMZ: Fracturing Design, Execution and Operation Lessons Learnt in Highly Deviated Well with Nearby Shale, Coal and Water Contact

M. Ismail, Sunanda Magna Bela, S. Hashim, Khai Lun Tham, C. H. Roh, S. N. M. Bt M. Zain, Nur Hidayah M Zamani, Jagaan Selladurai
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Abstract

Wellbore enlargement technique such as hydraulic fracturing or frac packing (or extension pack using linear gel) treatment is very much required in the brown field reservoirs with unconsolidated sands, poor sorting, and uniformity coefficient as well as very high fine content. The cost escalates when this requirement happens for multiple zones which needs longer rig time. This paper will discuss on the execution part of 7" ESTMZ system deployment, extension pack design, lessons learnt and required mitigation on the system itself. Conventionally, most of the operator will perform extension pack operation using stack-pack technique which required longer rig time, due to repetition of perforation, deburring and installation of gravel pack assembly which followed by gravel placement operation based on number of zones. Further optimization is the Single Trip Multi Zone (STMZ) system developed to enable multi zones gravel placement treatment and installation done in single trip in order to reduce the rig time. However, the 7" STMZ system is still have some limitation on its pumping capability due to system design and high friction pressure hence unable to be used for any frac-pack or extension pack treatment. The next generation of 7" ESTMZ system was introduced to overcome all the limitation of its predecessor and enables the frac-pack operation to be performed in a single trip manner which assuredly reduced considerable rig days. Furthermore, this system can eliminate deployment of inner string inside lower completion assemblies for zonal isolation and reservoir selectivity which can be risky especially in highly deviated wells. This system comes with modular screen design with integrated sliding sleeve with proprietary shifting profile. Like the conventional stack pack system, a sump packer will be run in hole via wireline and tractor as a base for sump area and depth reference. Then, the well is perforated with oriented gun and selected perforation technique for all zones in a single trip followed by debur run using wellbore clean out BHA. ESTMZ assembly is deployed to cover all zones with single concentric wash pipe system for the treatment. The zone interval length and zonal spacing are fully independent and may come with various length as oppose to the STMZ system. Hence, no dummy zone is required. The gravel placement design for this particular field was designed precisely to contain the growth to avoid fracturing into the nearby coal, shale, and water contact region. As a result, the reservoirs were successfully treated with extension pack of 220lb/ft packing factor at highest proppant concentration of 4.8ppg and 10bpm pumping rate. The technology discussed in this paper is a first in the world application in highly deviated well category where the author is intended to register the pain points as well as best practices to be replicated.
ESTMZ:具有页岩、煤和水接触面的大斜度井的压裂设计、执行和操作经验
对于砂粒疏松、分选差、均匀系数高、细粒含量高的棕色油藏,非常需要水力压裂或压裂充填(或使用线性凝胶的延长充填)等井筒扩大技术。当这种需求发生在多个区域时,成本就会上升,这需要更长的钻井时间。本文将讨论7”ESTMZ系统部署的执行部分、扩展包设计、经验教训和系统本身所需的缓解措施。通常情况下,大多数作业者会使用叠包技术进行扩展充填作业,这需要更长的钻机时间,因为要重复进行射孔、去毛刺和砾石充填组合的安装,然后根据层数进行砾石充填作业。进一步的优化是开发了单趟下入多层(STMZ)系统,可以在一次下入中完成多层砾石充填处理和安装,以减少钻机时间。然而,由于系统设计和高摩擦压力,7”STMZ系统的泵送能力仍然受到一些限制,因此无法用于任何压裂充填或扩展充填处理。新一代7”ESTMZ系统克服了其前身的所有限制,使压裂充填作业能够在一次下钻中完成,从而大大减少了钻井时间。此外,该系统可以避免在下部完井组合中部署内管柱进行层间隔离和储层选择,这在大斜度井中尤其危险。该系统采用模块化筛管设计,集成滑套,具有专有的移动轮廓。与传统的堆封系统一样,储油池封隔器将通过电缆和牵引器下入井中,作为储油池面积和深度参考的基础。然后,在一次起下钻中,使用定向射孔枪和选定的射孔技术对所有区域进行射孔,然后使用井筒清洗BHA进行调试。ESTMZ组合采用单一同心冲洗管系统进行处理,覆盖所有区域。层间长度和层间间距是完全独立的,与STMZ系统相反,可以有不同的长度。因此,不需要虚拟区域。该油田的砾石充填设计精确地控制了砾石的生长,以避免压裂进入附近的煤、页岩和水接触区域。结果,在最高支撑剂浓度为4.8ppg、泵送速率为10bpm的情况下,储层的充填系数达到220lb/ft。本文讨论的技术是世界上首次在大斜度井中应用,作者旨在记录痛点以及可复制的最佳实践。
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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