利用闲置海底主油管将火炬系统转移到分离平台的动态仿真评估

Winanto Winanto, M. Bahroinuddin, E. Cahyono, Margaretha Thaliharjanti
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引用次数: 0

摘要

KLB是一个海上平台,由生产井和两个列车气举压缩机组成。在修井期间,由于工作区域的潜在火炬辐射超过500 BTU/h -ft2,并且火炬尖端的气体弥散度超过50% -LEL, KLB作业团队必须关闭火炬系统。将KLB燃除系统搬迁至最近的平台,使KLB气举压缩机在活动期间保持运行。搬迁方案可以保持KLB平台700桶/天的产量。九龙站是离九龙站最近的站台。两者之间相距1公里,由一条闲置的海底输油管道连接,但由于KLB平台的空间有限,没有清管设施。因此,重新安置KLB燃烧系统的综合评价是:a)利用Flare Network软件模拟KLA和KLB燃烧系统排气管背压和马赫数进行燃烧系统研究;b).利用Flow Assurance Software进行动态瞬态仿真,计算火炬KO鼓内的背压、液含率和段塞状况;c)耀斑辐射和弥散研究。闲置海底输油管道的初始状态是充满液体,作为管道的保存,以防止在闲置状态下发生泄漏时进一步泄漏。闲置海底管道的脱水过程是通过使用0.7 MMscfd的气举和100 psig的压力来净化管道,将液体含量置换到20桶。以4.1 MMscfd的气量作为列车压气机扩气工况,进行了换气瞬态仿真。KLB安全阀的计算反压力比要求的最大值30psig低12.3 psig。在扩压过程中,Flare KO鼓内计算的液体喘振量为17桶,可以通过KO鼓内的喘振量来处理。海底管道内的预测凝结表明,燃除系统的最大运行时间限制在30天。辐射和气体扩散到最近的设施都在安全范围内。KLB团队成功地将燃烧系统从KLB平台迁移到KLA平台。其结果是没有中断生产,没有辐射风险,并且在修井期间没有潜在的爆炸。过去两次活动的经验证实,这种方法可以防止190亿印尼盾的收入损失。这项研究为火炬系统提出了一个新的工程标准和最佳实践,而不是目前的做法,即火炬位置应与生产设施位于同一位置,中间没有口袋管道。这项研究和现场经验证明,通过进行工程评估,以确保过程和过程安全标准符合公司和国际标准,可以将燃烧系统安装在不同的平台上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Dynamic Simulation Assessment for Relocating Flare System into Separated Platform Utilizing Idle Subsea Main Oil line
KLB is an offshore platform that consists of production wells and two train gas lift compressors. During well intervention, the KLB operation team must turn off the flaring system due to potential flare radiation of more than 500 BTU/hr-ft2at the working area and gas dispersion more than 50 %-LEL at the flare tip. The relocation of the KLB flaring system to the nearest platform keeps the KLB gas lift compressor operating during this activity. The relocation scenario can maintain the KLB platform production of 700 BOPD. KLA Flowstation is the nearest platform to the KLB. It is separated one kilometer, connected by an idle subsea oil pipeline, but there are no pigging facilities due to limited space at the KLB platform. Therefore, the comprehensive assessment to relocate the KLB flaring system is a) Flare system study using Flare Network software to simulate backpressure and Mach Number at tailpipe in the KLA and KLB flaring system; b). Dynamic transient simulation using Flow Assurance Software to calculate backpressure, liquid hold up, and slugging condition in the flare KO drum; and c). Flare radiation and dispersion study. The initial condition of the idle subsea oil pipeline was full of liquid as the preservation for a pipeline to prevent a further oil spill in case of a leak during the idle condition. The dewatering process for the idle subsea pipeline has been conducted by purging the pipeline utilizes 0.7 MMscfd gas lift with a pressure of 100 psig to displace liquid content to 20 bbl. The transient simulation for gas swapping was conducted at a gas rate of 4.1 MMscfd as the train compressor's flaring condition. The calculated backpressure at the KLB safety valve is 12.3 psig below the required maximum of 30 psig. The calculated liquid surge volume in the Flare KO drum during flaring is 17 bbl and can be handled by surge volume inside the KO drum. The predicted condensation inside the subsea pipeline shows that the maximum operation of the flaring system is limited to 30 days. The radiation and gas dispersion to the nearest facility is within a safe limit. The KLB teams successfully conducted the relocation of the flaring system from the KLB platform to the KLA platform. The result was no interruption of production, no risk of radiation, and no potential explosion during a well intervention. Experience in the last two activities has confirmed that this method can prevent revenue loss of 19 billion rupiahs. This study has initiated a new engineering standard and best practice for flaring systems as opposed to the current practice which states that the flare location shall be at the same location as the production facilities with no pocket piping in between. This study and field experience have proved that the flaring system can be located on a different platform by conducting engineering assessments to ensure process and process safety criteria are within Company and International Standard.
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