利用新型可膨胀钢封隔器解决水平井多级压裂完井部署难题

E. Ombe, E. Gomez, Aldia Syamsudhuha, Abdullah M. AlKwiter
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摘要

本文讨论了在高压高温(HP/HT)水平气井中成功应用多级压裂(MSF)完井,该完井由新型可膨胀钢封隔器组成。这些井的5-7/8”水平段是在高压、高温含气地层中钻探的。由于需要不断地进行地质导向,以保持分支在含油气区域内,因此井眼沿线也存在冲蚀和高“狗腿”现象。这些因素给常规的MSF完井作业带来了挑战。由于封隔器弹性体的脆弱性质以及在高温下的易降解性,这些常规的MSF完井无法在如此恶劣的井下条件下进行,否则会有损坏或卡在井底的风险。本文介绍了一种新型的可膨胀钢封隔器MSF完井在这些恶劣的井下条件下的应用。这些可膨胀钢制封隔器可以克服上述挑战,因为它们具有以下独特的特性:高温耐久性。增强了坚固性,使它们能够在没有损坏风险的情况下旋转和往复。与传统弹性MSF封隔器的5.625”外径相比,封隔器外径减小了5.500”。提高了灵活性,使其能够部署在高狗腿严重程度(DLS)的井眼中。由于在入井(RIH)过程中能够旋转和往复旋转,再加上具有更高的环空间隙和高温耐受性,可膨胀钢封隔器是克服RIH过程中MSF完井损坏或卡死风险的关键。此外,与传统的弹性体封隔器相比,可膨胀钢封隔器的坐封压力更高,因此在部署过程中遇到高循环压力时,可以降低过早坐封封隔器的风险。这些可扩展封隔器的另一个显著优势是,它们提供了优化机会,减少了MSF完井中所需的封隔器数量。在常规的MSF完井中,通常需要两个弹性体封隔器来确保每个MSF级之间的最佳层间隔离。然而,由于其优越的密封能力,只需要一个可膨胀的钢制封隔器就可以确保良好的级间隔离。这大大减少了MSF完井所需的封隔器数量,从而降低了其刚度,最终降低了RIH时卡钻的可能性。使用这些可膨胀钢封隔器的结果是在这些恶劣的井下条件下成功部署了MSF完井,消除了与MSF完井卡钻或损坏相关的非生产时间,并在这些关键的水平气井中实现了安全、经济的完井。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Utilizing Novel Expandable Steel Packers to Overcome Multi-Stage Fracturing Completion Deployment Challenges in Horizontal Gas Wells
This paper discusses the successful deployment of Multi-stage Fracturing (MSF) completions, composed of novel expandable steel packers, in high pressure, high temperature (HP/HT) horizontal gas wells. The 5-7/8" horizontal sections of these wells were drilled in high pressure, high temperature gas bearing formations. There were also washed-outs & high "dog-legs" along their wellbores, due to constant geo-steering required to keep the laterals within the hydrocarbon bearing zones. These factors introduced challenges to deploying the conventional MSF completion in these laterals. Due to the delicate nature of their packer elastomers and their susceptibility to degradation at high temperature, these conventional MSF completions could not be run in such hostile down-hole conditions without the risk of damage or getting stuck off-bottom. This paper describes the deployment of a novel expandable steel packer MSF completion in these tough down-hole conditions. These expandable steel packers could overcome the challenges mentioned above due to the following unique features: High temperature durability. Enhanced ruggedness which gave them the ability to be rotated & reciprocated during without risk of damage. Reduced packer outer diameter (OD) of 5.500" as compared to the 5.625" OD of conventional elastomer MSF packers. Enhanced flexibility which enabled them to be deployed in wellbores with high dog-leg severity (DLS). With the ability to rotate & reciprocate them while running-in-hole (RIH), coupled with their higher annular clearance & tolerance of high temperature, the expandable steel packers were key to overcoming the risk of damaging or getting stuck with the MSF completion while RIH. Also, due to the higher setting pressure of the expandable steel packers when compared to conventional elastomer packers, there was a reduced risk of prematurely setting the packers if high circulating pressure were encountered during deployment. Another notable advantage of these expandable packers is that they provided an optimization opportunity to reduce the number of packers required in the MSF completion. In a conventional MSF completion, two elastomer packers are usually required to ensure optimum zonal isolation between each MSF stage. However, due to their superior sealing capability, only one expandable steel packer is required to ensure good inter-stage isolation. This greatly reduces the number of packers required in the MSF completion, thereby reducing its stiffness & ultimately reducing the probability of getting stuck while RIH. The results of using these expandable steel packers is the successful deployment of the MSF completions in these harsh down-hole conditions, elimination of non-productive time associated with stuck or damaged MSF completion as well as the safe & cost-effective completion in these critical horizontal gas wells.
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