扩展试井智能完井

Flavio Costa Coccoli, Luiz Carlos Milagre Cruz, Thiago Henrique Galindo Vasconcelos, Rogério Pinto Marti
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摘要

本文介绍了Libra公司在EWT井的完井设计、作业性能和智能完井应用情况。此外,它还将描述支持整个油田开发的新技术。本文介绍了EWT计划的实施,以帮助全油田开发,其中包括多达四个超深水大型项目。假设EWT井为保管井,因此设计为可转换井,同时具有采油和水交替注气的冶金要求。智能完井,每个生产区域都有多个位置的阀门,可以在一个区域进行回堵气锥进、早期气体突破或产水,而另一个区域保持打开状态。这些阀门可以用于确定不同储层之间的垂直连通性,从而使一个储层在生产另一个储层的同时形成储层。到目前为止,EWT项目已经完成了4口评价井,使用的是全双钻机。其中三次完井是按顺序完成的,提供了良好的学习曲线,大大减少了时间,并且没有安装问题。作业效率的提高与HSE事故的减少之间存在明显的相关性。智能完井技术的使用使高效增产成为可能,避免了酸化作业期间的层间通信。产量达到60千桶油当量/天以上,回注气量为100立方英尺/天。这种注入速度意味着由于诱发振动而导致控制线疲劳的风险,因此需要通过计算流体动力学(CFD)研究来确定最大注入速度。由于在EWT期间观察到一些操作困难,作业者实施了智能完井阀的缓解措施。这些情况不会影响EWT信息采集计划,但对于Mero油田未来的开发项目来说,这些项目也将考虑多路智能完井和裸眼智能完井,这代表了重要的操作经验。Libra Consortium采用的方法有助于获得碳酸盐岩油藏的早期井设计经验和智能完井行为,在高CO2和高GOR的情况下,必须进行回注,而智能完井是一种强制性策略。完井设计的性能符合现场评价目的,这些井将成功地作为守护井使用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Intelligent Completion in Extended Well Test
This paper describes the wells completion design, operational performance and use of intelligent completion by Libra Consortium for EWT wells. Additionally, it will describe new technologies that will support the full field development. The paper presents the de-risking plan EWT Program implementation to help full field development, which consists up to four ultra-deepwater mega projects. The EWT wells were assumed as keepers, thus designed as convertible, with metallurgy requirements for both oil production and Water Alternating Gas injection. The intelligent completion, with multi-position valves for each production zone, was selected to allow choking-back gas coning, early gas breakthrough or water production in one zone, while another remains opened. These valves were useful to determine vertical communication between different reservoir zones, making it possible to have buildup in one zone while producing another. Four appraisal wells were completed, for the EWT program up to now, using a full-dual rig. Three of the completions were in sequence, providing a sound learning curve with a significant time reduction, and no installation problems. It was noticeable a correlation between improvement in operational efficiency and a decrease in HSE incidents. The use of intelligent completion made possible an efficient well stimulation, avoiding inter-zonal communication during the acid job. A production rate higher than 60 kboe/day was reached and 100 MM scf/day gas was re-injected. This injection rate implied risk of control lines fatigue due to induced vibration, therefore a Computational Fluid Dynamics (CFD) study was required to determine the maximum injection rate. The Operator implemented mitigation measures for intelligent completion valves actuation since some operational difficulties were observed during the EWT. These situations did not affect the EWT information acquisition plan, but represented significant operational experience for Mero Field future development projects, where multiplexed intelligent completions and open-hole intelligent completion are being also considered. The approach taken by Libra Consortium helps to gain early experience about well design for carbonate reservoirs and intelligent completion behavior, with high CO2 and GOR, where gas re-injection is a necessity and the use of intelligent completion is a mandatory strategy. The performance of the completion design fitted the field evaluation purpose and the wells will be successfully used as keepers.
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