Un-Locking Subsea Reserves Through a System-Based Approach for Tie-Back Solutions

Kristian Mikalsen, C. Loper
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Abstract

Offshore developments must evolve if the industry is to unlock subsea reserves and increase recovery. A novel method of achieving these goals is through use of a systematic approach to subsea tiebacks that combines new technologies with minor modifications to the existing topsides equipment. The tieback strategy is a system-based approach with a combination of qualified disruptive technologies and field-proven solutions that will improve costs, reduce the number of interfaces, minimize the modifications needed on the topsides, critical for platforms with space and weight limitations, and maximize the use of existing assets. Significant investment was made to qualify disruptive and groundbreaking technologies to make this possible. The following summarizes the main components of the subsea system: –Seabox subsea water treatment and injection provides higher quality water for reservoir injection and increased recovery–Subsea chemical storage that allows longer subsea tiebacks and mitigates weight and space limitations on topside structures; only power and communication are needed from the topside–Subsea treatment of produced water subsea for either discharge directly to sea or to re-inject–Subsea automatic pig launcher combined with a single pipeline that ensures continuous flow at a lower capex–All-electric controls and valves eliminate the need for utility pipelines and expensive umbilicals–Applying field-proven tie-in systems integrated with flexible pipe solutions and customized subsea structures In addition to exploring the above components, this paper also explores combining the components into a comprehensive system. The system-based approach will unlock previously uneconomical reservoirs.
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通过基于系统的回接解决方案解锁海底储量
如果油气行业想要释放海底储量并提高采收率,就必须发展海上开发。实现这些目标的一种新方法是采用系统的海底回接方法,将新技术与现有上层设备的微小修改相结合。该回接策略是一种基于系统的方法,结合了合格的颠覆性技术和经过现场验证的解决方案,可以提高成本,减少接口数量,最大限度地减少上层平台所需的修改,对于空间和重量有限的平台至关重要,并最大限度地利用现有资产。为了实现这一目标,我们投入了大量资金来验证颠覆性和突破性的技术。海底系统的主要组成部分如下:-Seabox海底水处理和注入为油藏注入提供更高质量的水,提高采收率-海底化学储存,允许更长时间的海底回接,减轻了上部结构的重量和空间限制;水下采出水进行海底处理,可以直接排放到海上,也可以重新注入;水下自动清管器与单条管道相结合,确保以较低的成本连续流动;全电动控制和阀门消除了对公用管道和昂贵的脐带缆的需求;除了探索海底,还应用了现场验证的连接系统,集成了灵活的管道解决方案和定制的海底结构以上各部分,本文还探讨了将各部分组合成一个综合系统。基于系统的方法将解锁以前不经济的油藏。
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